Depositional and Provenance Records of Lower Permian Sandstones from Sishichang Area, Northwestern Tarim Basin: Implications for Tectonic Evolution
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摘要: 石炭纪-二叠纪南天山洋-塔里木盆地北部陆缘构造演化众说纷纭.选择塔里木盆地内紧靠南天山的四石厂剖面，针对下二叠统康克林组露头，在沉积、碎屑组分、重矿物组合分析基础上，重点通过LA-ICP-MS分析砂岩样品碎屑锆石的原位U-Pb和Lu-Hf同位素特征，解析其年代学、物源特征及构造演化等信息.研究显示，砂岩样品碎屑组分基本都落入陆块物源区和成熟岩石与稳定构架合并处，重矿物组合以稳定重矿物为主，反映稳定的大地构造背景.砂岩碎屑锆石定年结果显示5组年龄：407~501 Ma、755~873 Ma、889~1 129 Ma、1 792~2 079 Ma、2 393~2 496 Ma，主要反映了5期构造热事件.对比潜在物源区，塔里木盆地内古隆起可能为主物源，与西昆仑-阿尔金造山带剥蚀物源相关的塔里木盆地内前二叠纪沉积也可能提供部分再旋回物源.物源特征显示，虽然南天山洋已经闭合，但直到早二叠世阿瑟尔期仍然没有大规模隆升，洋盆闭合事件对塔里木盆地西北缘构造格局和物源体系影响较小.对比前人研究成果认为，早二叠世从阿瑟尔期至萨克马尔期，柯坪地区的物源结构发生重大变化，由盆地内古隆起单一物源转变为盆内和造山带双重物源.已经闭合的南天山洋盆在萨克马尔期开始隆升造山，成为塔里木西北缘的一个重要物源区.Abstract: Carboniferous-Permian is the critical tectonic evolution period of the South Tianshan Ocean and the northern margin of Tarim basin. The Carboniferous-Permian outcrop, located in the northwestern margin of Tarim basin, near the South Tianshan orogen, is well exposed in the Sishichang area, and is selected to analyze this problem. Based on depositional system, sandstone skeleton component, heavy minerals, especially detrial zircon geochronology analysis by LA-ICP-MS in situ U-Pb and Lu-Hf isotope, this study further explores provenance, tectonic evolution and its geodynamic mechanism about the Tarim basin and the periphery orogenic belt. The results show that sandstone grains are dotted in the continental block provenances and the merger of fields for mature rocks with stable frameworks; the main proportions of heavy mineral assemblages are the stable heavy minerals. These results reflect that tectonic setting may be stable. The geochronological samples show multiphase tectono-thermal events with age groups of 407-501 Ma, 755-873 Ma, 889-1 129 Ma, 1 792-2 079 Ma, and 2 393-2 496 Ma. Compared with the potential source areas, the main provenance may be the Tarim palaeohigh. The redeposition of pre-Permian strata in the Tarim basin, associated with the erosion source in the Kunlun-Altun orogen, may also have some contribution. In other words, although the South Tianshan Ocean may have been closed, the South Tianshan orogenic belt did not uplift on a large scale until the Asselian. And the tectonic pattern and provenance of northwestern margin of Tarim basin changed little because of the closure. Referring to the previous data, it is concluded that the single source of the Tarim palaeohigh has developed into the dual sources of the Tarim basin and orogenic belt form Asselian to Sakmarian, and the provenance system of Keping area changes greatly. Furthermore, the South Tianshan Ocean, closed in Carboniferous, began to uplift in Sakmarian, and became an important source to the northwestern margin of Tarim basin.
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0. 引言
探索南天山洋的形成演化，是认识天山和塔里木盆地的重要领域.前人对古生代天山和塔里木盆地的耦合关系进行了诸多研究，取得了丰硕的成果，但迄今为止对洋盆的属性、俯冲极性和演化模式等问题仍然存在诸多争议(高俊等, 2006, 2009; Charvet et al., 2007; Wang et al., 2011; Ge et al., 2012a; Lin et al., 2013).如关于南天山洋的俯冲极性就存在3种观点：古洋盆向北俯冲至中天山-伊犁地块之下(Carroll et al., 1995, 2001；高俊等, 2006, 2009)，向南俯冲至塔里木板块下(Wang et al., 2011; Lin et al., 2013)，向南向北双向俯冲(Ge et al., 2012a).关于南天山古洋盆的闭合时间争议最大，有早-中泥盆世(王作勋等, 1990)、晚泥盆世-早石炭世(高俊等, 2006, 2009; Charvet et al., 2007)、晚泥盆世-石炭纪(高长林等, 1995)、晚石炭世-早二叠世(郝杰和刘小汉, 1993)、二叠纪末-三叠纪初(Zhang et al., 2007)等诸多观点.近年来在塔里木盆地北缘库鲁克塔格(贾晓亮等, 2013)、色日牙克依拉克(朱志新等, 2008)、库尔勒附近(Ge et al., 2012a; Lin et al., 2013;郭瑞清等, 2013)发现了一系列古生代岛弧，加剧了天山造山带和塔里木盆地演化的争议.然而，这些洋-陆转换构造演变关键期的证据大多来自造山带结晶岩石学、地球化学以及造山带地层-构造综合的工作(郝杰和刘小汉, 1993；高俊等, 2006, 2009; Charvet et al., 2007; Wang et al., 2011; Ge et al., 2012a; Lin et al., 2013)，对洋-陆转换更为敏感的沉积地质记录分析则不多见(Carroll et al., 1995, 2001)，或者只是涉及沉积地层古生物的探索(Liu, 2001).
沉积盆地与相邻造山带是不可分割的整体，通过塔里木盆地的研究可以反演天山造山带和塔里木盆地的演化过程.运用碎屑锆石原位U-Pb和Lu-Hf同位素信息来判断物源、恢复古地理、揭示构造演化已经成为一种成熟的方法(Ge et al., 2012a; Liu et al., 2012; Lin et al., 2013;李忠和彭守涛，2013；李忠等，2015；郭春涛等，2017).借鉴该方法，本文对塔里木盆地西北缘柯坪地区四石厂剖面下二叠统康克林组碎屑样品进行了详细的碎屑组分、砂岩重矿物分析，并在此基础上应用LA-ICP-MS方法进行碎屑锆石U-Pb和Lu-Hf同位素分析，并将之与盆地周缘造山带和克拉通内的构造热事件进行对比，重点探讨碎屑物源体系及晚古生代塔里木盆地陆缘构造演化，为更深入地探讨该时期塔里木盆地与周缘造山带的耦合关系提供新的参考.
1. 地质背景和样品
1.1 沉积地层
四石厂剖面位于塔里木盆地西北缘的柯坪地区，构造上属于柯坪断隆.柯坪断隆北以喀拉铁克断裂与南天山造山带为界，南以柯坪塔格南缘断裂与塔里木盆地内的巴楚断隆和阿瓦提凹陷相接，西界与麦盖提斜坡相接，东段位于阿克苏附近，向库车凹陷、塔北隆起逐渐过渡(图 1).四石厂剖面位于柯坪断隆东段(图 1).
图 1 四石厂地区地质简图及碎屑锆石样品位置Fig. 1. Geological sketch map of Sishichang area and the position of detrial zircon samples石炭纪柯坪地区海水自北向南海侵，沉积相带时空展布规律有序，由西北向东南依次可划分为斜坡或盆地相、台缘生物礁相、台地相(周志毅等, 2001).晚石炭世-早二叠世继续向南海侵，在四石厂地区沉积康克林组，其沉积特征和规律与柯坪、西南天山临近地区基本一致，因此四石厂地区康克林组是认识柯坪地区构造演化、解析石炭纪-二叠纪塔里木盆地与南天山洋关系的敏感地区.
晚石炭世至早二叠世，自南天山向塔里木盆地方向，沉积水体逐渐变浅，南天山造山带内的阿依里河剖面上石炭统主要为陆棚、斜坡相的钙质砂岩、钙质粉砂岩(图 2)，乌什地区为台地、陆棚、斜坡相的碎屑岩和碳酸盐岩，四石厂地区仅发育下二叠统三角洲、台地相沉积，而塔里木盆地内部大部分地区为剥蚀区.同时，从早石炭世至早二叠世沉积相带逐渐向南迁移，物源逐渐向盆地内迁移(郭春涛等，2015).
图 2 四石厂康克林组剖面柱状图及样品采集据周志毅等(2001)修改Fig. 2. The depositional column of Kangkelin Formation and position of samples in the Sishichang outcrop康克林组岩性主要为浅灰色灰岩和生屑灰岩，厚度为70~170m，化石丰富，在印干山(图 1)以东四石厂地区上覆库普库兹满组，库普库兹满组之上为开派兹雷克组，以西为巴立克立克组，均与康克林组呈平行不整合接触.但在四石厂一带，康克林组之下还有一套碎屑岩层，岩性主要为砂岩、粉砂质泥岩和砾岩，呈不等厚互层，缺乏标准化石分子(周志毅等, 2001).本次研究的重点即为这套碎屑岩层.
传统上柯坪地区康克林组被认为属于上石炭统-下二叠统，但在四石厂剖面，康克林组上部灰岩层底部含有标准化石带Sphaeroschwagerina，由于下部碎屑岩化石稀少，不能确定Sphaeroschwagerina分子的首现时间，因此常将四石厂剖面康克林组划归下二叠统阿瑟尔阶(图 2).
1.2 样品采集
针对该剖面进行了系统的样品采集与测试(图 1，图 2).符合统计条件(李忠等, 1999)的砂岩碎屑骨架样品共9个，碎屑重矿物样品共2件，均为细砂岩.
本文碎屑锆石样品G8采自康克林组底部，GPS坐标为E79°50′12″、N40°49′39″，为灰白色细砂岩，具体采样位置见图 1和图 2.镜下石英颗粒约占碎屑颗粒总量的85%，主要为单晶石英(图 3).长石很少，岩屑含量少于10%，主要为(变质)沉积岩岩屑.次棱角-次圆状，钙质胶结，分选较好，石英表面光洁，边缘清晰，没有受到明显的后期改造.
图 3 康克林组砂岩镜下特征Q.总的石英；Qm.单晶石英；Qp.多晶石英；F.总的长石；K.钾长石；P.斜长石；Lv.(变质)结晶岩岩屑；Ls.(变质)沉积岩岩屑；Lt.总岩屑；L.不稳定复晶岩屑Fig. 3. Microscopic features of sandstones of the Kangkelin Formation2. 沉积环境与岩矿组成特征
2.1 沉积环境
康克林组是早二叠世海侵过程的产物.下伏的克兹尔塔格组以紫红色泥岩、粉砂岩为主，与康克林组呈角度不整合接触(图 4a).不整合面之上康克林组碎屑岩主要为三角洲沉积，底部发育底砾岩(图 4b)，分选较差、磨圆一般(图 4b)，砾石以砂质、灰质和石英质为主，向上石英质增多.底砾岩之上可见多个小型的楔状体(图 4c).底砾岩和第二层砾岩之间，主要以砂岩为主，发育大型板状交错层理、平行层理(图 4c)、双向交错层理(图 4d)，同时也见冲刷构造.第二层砾岩分选磨圆都比较差(图 4e)，之上为紫红色泥岩与砂岩互层，发育平行层理、斜层理，同时发育水下河道(图 4f)，说明该区以有波浪作用的三角洲前缘沉积为主.碎屑岩之上为厚层状生屑灰岩(图 4g)，化石含量丰富(图 4g，4h)，同时还发育薄层状灰岩，为水体能量较强的浅水台地沉积.
图 4 四石厂剖面主要岩性和沉积构造a.克兹尔塔格组与康克林组之间不整合接触；b.康克林组底砾岩；c.楔状体和平行层理；d.双向交错层理；e.分选磨圆较差砾岩；f.水下河道；g.生物碎屑；h.化石；i.薄层状灰岩Fig. 4. Lithologic and sedimentary structure photographs of the Sishichang outcrop2.2 碎屑岩矿特征
碎屑骨架组成分析方法参考李忠等(1999)和Dickinson and Suczek(1979).符合统计原则并参加作图的有效砂岩样品共9个(图 2).
康克林组砂岩颗粒成分以单晶石英为主(图 3)，平均含量为87.7%~94.5%，多晶石英很少，含量小于2.5%，主要为燧石.长石含量为1.2%~5.2%，以斜长石为主，部分发生碳酸盐化.基本不含云母.岩屑以(变质)沉积岩岩屑为主，含量为1.8%~6.7%，包括石英砂岩岩屑、泥岩岩屑等.(变质)结晶岩岩屑极少.Dickinson系列三角图如图 5所示.
图 5 砂岩碎屑组分与物源类型三角图底图据Dickinson and Suczek(1979).1.本文康克林组样品；2.康克林组样品，据Carroll et al.(2001)；3.库普库兹满组样品，据Carroll et al.(2001).Q.总的石英；Qm.单晶石英；Qp.多晶石英；F.总的长石；K.钾长石；P.斜长石；Lv.(变质)结晶岩岩屑；Ls.(变质)沉积岩岩屑；Lt.总岩屑；L.不稳定复晶岩屑Fig. 5. Triangular plots showing sandstone fragment components and provenance由图 5可以看出，样品基本都落入陆块物源区和成熟岩石与稳定构架合并处，反映康克林组的物源主要为研究区周缘古隆起，且该时期构造活动平静，盆山分异作用弱.古水流也显示物源可能来自盆地的东南方向(Carroll et al., 2001).
图 5还对比了康克林组之上的下二叠统库普库兹满组的砂岩碎屑组分.库普库兹满组砂岩碎屑组分以花岗岩岩屑、单晶石英和斜长石为主，其物源可能为天山造山带(Carroll et al., 1995, 2001).研究区康克林组、库普库兹满组所代表的早二叠世物源发生了显著变化，可能由盆地内的古隆起转变为隆升造山的天山造山带.
同时，笔者对康克林组2件砂岩AK1-06、AK2-16进行重矿物组合分析.鉴定的体积百分比列于表 1和图 2.两件样品的重矿物表形特征具有很大的相似性.锆石分两种，一种呈玫瑰色，透明或者金刚-弱毛玻璃光泽，半自形为主，少数为自形；另一种锆石呈浅粉色，半自形-次圆粒状为主，个别为自形，透明或金刚-弱毛玻璃光泽.含TiO2矿物多为次棱角状-次圆状.电气石多为黑褐色，柱状、次圆粒状，透明-玻璃光泽.镜铁矿、赤褐铁矿形态多为立方体或次棱角状，该类重矿物可能大多是自生矿物，在对比时将其剔除.
表 1 康克林组砂岩重矿物统计Table Supplementary Table Heavy mineral statistics of sandstone samples in the Sishichang outcrop样品 锆石 白钛石 金红石 锐钛矿 电气石 重晶石 铬尖晶石 AK1-06 70.0 8.3 5.4 5.4 9.3 0.5 1.2 AK2-16 75.8 6.5 1.6 0.4 11.6 4.0 0.1 注：重矿物含量为体积百分比，%. 重矿物分析结果显示，重矿物类型以锆石、白钛石、金红石、锐钛矿、电气石为主(图 2).2件样品的重矿物组合一致，以锆石+电气石+TiO2矿物为主，其含量占96%以上.从重矿物组合特征来看，源区母岩类型始终以沉积岩+低级变质岩为主.稳定重矿物占优势，不含不稳定重矿物，说明早二叠世研究区盆山分异作用弱，构造活动比较平静.
3. 碎屑锆石年代学分析
3.1 测试方法与结果
CL图、U-Pb、Lu-Hf测试分别在中国科学院地质与地球物理研究所电子探针与电镜实验室、多接收等离子体质谱仪实验室完成.样品分析时激光斑束直径为32μm，光剥蚀样品深度为20~40μm.标准锆石91500和NIST610被用来进行数据校正.数据处理采用软件Glitte 4.0，对所有数据进行普通Pb校正.取不谐和度小于10%的为有效数据点.年龄计算和图谱制作运用Isoplot软件处理，详细的实验步骤和处理方法参见Yuan et al.(2004).
Hf同位素测定在Neptune MC-ICP-MS仪器上进行，频率为8Hz，能量为100mJ，分析点与U-Pb定年分析点为同一位置.锆石Lu-Hf同位素测定用176Lu/175Lu=0.0266和176Yb/172Yb=0.5886进行同量异位干扰校正计算测试样品的176Lu/177Hf和176Hf/177Hf比值.εHf的计算采用176Lu衰变常数为1.865×10-11a.球粒陨石现今推荐值176Hf/ 177Hf=0.282772，176Lu/177Hf=0.0332，Hf亏损地幔单阶段模式年龄(TDM)的计算采用现今的亏损地幔176Hf/177Hf=0.2832和176Lu/177Hf=0.0384，两阶段模式年龄TDMC依据大陆上地壳平均组成(fLu/Hf=-0.72)计算.详细的实验步骤、处理方法和参数选取参见吴福元等(2007).
碎屑锆石U-Pb和Lu-Hf分析数据见表 2和表 3.样品U-Pb谐和图和年龄频谱图如图 6，对应的Th-U图解如图 7，典型的CL图解如图 8，εHf(t)图解如图 9.
表 2 四石厂剖面样品碎屑锆石U-Pb年龄测定结果Table Supplementary Table U-Pb isotopic compositions of detrital zircons from Sishichang Profile测试点 Th
(10-6)U
(10-6)Th/
U同位素比值 表面年龄(Ma) 谐和度
(%)207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ G8-1 233.21 492.81 0.47 0.10626 0.00148 4.51169 0.05793 0.30811 0.00386 1736 11 1733 11 1731 19 100.3 G8-2 1408.49 729.89 1.93 0.05554 0.00169 0.52870 0.01468 0.06908 0.00112 434 34 431 10 431 7 100.0 G8-3 83.09 139.42 0.60 0.12140 0.00231 5.99561 0.10612 0.35838 0.00574 1977 14 1975 15 1974 27 100.2 G8-4 83.77 282.21 0.30 0.08024 0.00178 2.26454 0.04591 0.20479 0.00312 1203 19 1201 14 1201 17 100.2 G8-5 190.28 344.28 0.55 0.07002 0.00176 1.38062 0.03164 0.14307 0.00221 929 24 881 13 862 12 102.2 G8-6 278.18 561.14 0.50 0.12688 0.00151 6.57148 0.07254 0.37585 0.00451 2055 9 2056 10 2057 21 99.9 G8-7 465.64 584.74 0.80 0.07730 0.00524 2.08761 0.13783 0.19586 0.00297 1129 139 1145 45 1153 16 97.9 G8-8 361.05 719.54 0.50 0.06637 0.00128 1.23448 0.02180 0.13496 0.00176 818 18 816 10 816 10 100.0 G8-9 570.87 525.21 1.09 0.05848 0.00182 0.56052 0.01591 0.06955 0.00115 548 34 452 10 433 7 104.4 G8-10 327.18 222.29 1.47 0.15947 0.00209 10.16686 0.12589 0.46262 0.00623 2450 10 2450 11 2451 27 100.0 G8-11 130.12 362.01 0.36 0.12263 0.00163 6.11968 0.07555 0.36211 0.00458 1995 10 1993 11 1992 22 100.2 G8-12 12961.52 1989.66 6.51 0.50744 0.01861 26.00374 0.82490 0.37184 0.01453 4263 26 3347 31 2038 68 209.2 G8-13 227.67 669.36 0.34 0.20167 0.00169 15.38139 0.12291 0.55340 0.00601 2840 8 2839 8 2839 25 100.0 G8-14 332.48 488.32 0.68 0.05488 0.00190 0.49291 0.01573 0.06516 0.00113 407 41 407 11 407 7 100.0 G8-15 257.89 392.33 0.66 0.06624 0.00147 1.22772 0.02494 0.13448 0.00189 814 21 813 11 813 11 100.0 G8-16 703.57 814.70 0.86 0.06944 0.00118 1.32745 0.02053 0.13869 0.00170 912 15 858 9 837 10 102.5 G8-17 847.47 1245.67 0.68 0.16308 0.00153 7.64361 0.06471 0.34005 0.00368 2488 8 2190 8 1887 18 131.8 G8-18 510.95 1047.06 0.49 0.07007 0.00210 1.12066 0.03045 0.11604 0.00204 930 29 763 15 708 12 107.8 G8-19 383.51 689.66 0.56 0.07955 0.00197 2.20132 0.04962 0.20077 0.00332 1186 21 1181 16 1179 18 100.6 G8-20 976.05 1184.89 0.82 0.06973 0.00127 0.99041 0.01629 0.10305 0.00129 920 16 699 8 632 8 110.6 G8-21 487.79 1169.08 0.42 0.08618 0.00129 2.74711 0.03745 0.23127 0.00282 1342 12 1341 10 1341 15 100.1 G8-22 338.59 234.45 1.44 0.08499 0.00281 2.66630 0.08095 0.22761 0.00486 1315 29 1319 22 1322 26 99.5 G8-23 243.06 682.05 0.36 0.08353 0.00126 2.51053 0.03474 0.21805 0.00265 1282 12 1275 10 1272 14 100.8 G8-24 89.36 105.81 0.84 0.11213 0.00344 4.95293 0.14056 0.32046 0.00731 1834 23 1811 24 1792 36 102.3 G8-25 270.31 577.58 0.47 0.05738 0.00202 0.59641 0.01922 0.07541 0.00138 506 40 475 12 469 8 101.3 G8-26 54.76 57.02 0.96 0.11280 0.00383 5.14837 0.16236 0.33110 0.00828 1845 26 1844 27 1844 40 100.1 G8-27 807.55 1183.92 0.68 0.06745 0.00124 0.93432 0.01559 0.10049 0.00125 852 16 670 8 617 7 108.6 G8-28 718.39 794.14 0.90 0.07020 0.00126 1.55443 0.02547 0.16063 0.00204 934 16 952 10 960 11 99.2 G8-29 1012.39 1144.38 0.88 0.11985 0.00277 4.77429 0.09542 0.28891 0.00334 1954 42 1780 17 1636 17 119.4 G8-30 151.63 202.69 0.75 0.11050 0.00201 4.93474 0.08286 0.32395 0.00484 1808 14 1808 14 1809 24 99.9 G8-31 611.26 784.49 0.78 0.05649 0.00172 0.57609 0.01613 0.07397 0.00119 472 34 462 10 460 7 100.4 G8-32 414.23 728.24 0.57 0.05685 0.00156 0.59881 0.01501 0.07641 0.00116 486 30 476 10 475 7 100.2 G8-33 306.61 1341.56 0.23 0.09590 0.00141 3.49932 0.04715 0.26471 0.00329 1546 11 1527 11 1514 17 102.1 G8-34 674.50 1762.35 0.38 0.14979 0.00138 7.37290 0.06163 0.35706 0.00379 2344 8 2158 7 1968 18 119.1 G8-35 120.84 169.78 0.71 0.07462 0.00208 1.82173 0.04664 0.17709 0.00305 1058 26 1053 17 1051 17 100.7 G8-36 93.97 121.25 0.78 0.06890 0.00318 1.35907 0.05792 0.14309 0.00349 896 49 871 25 862 20 101.0 G8-37 149.66 407.67 0.37 0.06767 0.00142 1.34025 0.02565 0.14366 0.00195 858 19 863 11 865 11 99.8 G8-38 763.08 825.27 0.92 0.05635 0.00127 0.54913 0.01130 0.07069 0.00093 466 24 444 7 440 6 100.9 G8-39 253.13 427.29 0.59 0.05627 0.00173 0.58216 0.01646 0.07505 0.00120 463 35 466 11 467 7 99.8 G8-40 187.37 420.25 0.45 0.06814 0.00130 1.36243 0.02370 0.14504 0.00187 873 17 873 10 873 11 100.0 G8-41 414.62 347.26 1.19 0.06520 0.00167 1.17602 0.02760 0.13083 0.00200 781 25 789 13 793 11 99.5 G8-42 138.27 309.76 0.45 0.13442 0.00260 7.36128 0.13370 0.39721 0.00668 2157 14 2156 16 2156 31 100.0 G8-43 259.95 860.48 0.30 0.07417 0.00120 1.79655 0.02642 0.17570 0.00213 1046 13 1044 10 1043 12 100.3 G8-44 1163.24 1277.92 0.91 0.17754 0.00145 10.19038 0.07604 0.41632 0.00428 2630 8 2452 7 2244 19 117.2 G8-45 613.51 1799.10 0.34 0.15229 0.00130 7.56765 0.05872 0.36042 0.00370 2372 8 2181 7 1984 18 119.6 G8-46 199.35 414.69 0.48 0.07104 0.00446 0.82503 0.04880 0.08423 0.00178 959 132 611 27 521 11 117.3 G8-47 235.14 554.28 0.42 0.05614 0.00171 0.57078 0.01591 0.07374 0.00118 458 34 459 10 459 7 100.0 G8-48 203.60 548.86 0.37 0.05730 0.00194 0.62465 0.01935 0.07907 0.00139 503 38 493 12 491 8 100.4 G8-49 732.58 459.59 1.59 0.07325 0.00229 1.16460 0.03287 0.11531 0.00211 1021 29 784 15 704 12 111.4 G8-50 440.06 850.33 0.52 0.12458 0.00155 6.35098 0.07305 0.36974 0.00447 2023 10 2026 10 2028 21 99.8 G8-51 343.12 529.69 0.65 0.06780 0.00133 1.34728 0.02409 0.14413 0.00188 862 18 866 10 868 11 99.8 G8-52 259.26 294.57 0.88 0.11174 0.00187 5.06593 0.07854 0.32880 0.00465 1828 13 1830 13 1833 23 99.7 G8-53 761.56 847.29 0.90 0.05564 0.00179 0.52473 0.01548 0.06839 0.00115 438 37 428 10 426 7 100.5 G8-54 226.20 319.87 0.71 0.09464 0.00217 3.29883 0.06947 0.25279 0.00418 1521 18 1481 16 1453 22 104.7 G8-55 370.65 704.12 0.53 0.06630 0.00210 1.26315 0.03658 0.13818 0.00250 816 32 829 16 834 14 99.4 G8-56 187.96 338.93 0.55 0.17065 0.00210 11.52206 0.13515 0.48969 0.00639 2564 10 2566 11 2569 28 99.8 G8-57 283.06 284.86 0.99 0.06156 0.00235 0.91100 0.03192 0.10734 0.00217 659 42 658 17 657 13 100.2 G8-58 169.59 119.37 1.42 0.05810 0.00446 0.53776 0.03805 0.06712 0.00232 534 95 437 25 419 14 104.3 G8-59 661.03 1178.81 0.56 0.06709 0.00100 1.29062 0.01754 0.13953 0.00157 841 13 842 8 842 9 100.0 G8-60 141.02 127.26 1.11 0.17687 0.00378 12.20401 0.25173 0.50041 0.01010 2624 16 2620 19 2616 43 100.3 G8-61 169.83 284.87 0.60 0.06210 0.00202 0.95146 0.02825 0.11111 0.00199 678 34 679 15 679 12 100.0 G8-62 463.01 701.82 0.66 0.07220 0.00115 1.65088 0.02401 0.16583 0.00197 992 13 990 9 989 11 100.1 G8-63 465.10 471.32 0.99 0.06684 0.00147 1.28751 0.02594 0.13971 0.00194 833 21 840 12 843 11 99.6 G8-64 299.36 348.51 0.86 0.06855 0.00191 1.39732 0.03579 0.14782 0.00243 885 27 888 15 889 14 99.9 G8-65 221.67 132.56 1.67 0.05762 0.00348 0.64196 0.03569 0.08079 0.00228 515 73 504 22 501 14 100.6 G8-66 217.13 296.64 0.73 0.05656 0.00262 0.58322 0.02490 0.07478 0.00166 474 56 467 16 465 10 100.4 G8-67 819.17 1043.75 0.78 0.07377 0.00132 1.64476 0.02676 0.16170 0.00205 1035 15 988 10 966 11 102.3 G8-68 208.72 1064.28 0.20 0.11344 0.00102 5.21484 0.04278 0.33339 0.00337 1855 8 1855 7 1855 16 100.0 G8-69 218.90 654.61 0.33 0.11010 0.00115 4.89341 0.04687 0.32232 0.00345 1801 9 1801 8 1801 17 100.0 G8-70 232.62 236.03 0.99 0.06975 0.00250 1.46819 0.04822 0.15266 0.00313 921 36 917 20 916 18 100.1 G8-71 42.86 41.98 1.02 0.15688 0.00551 9.80650 0.32929 0.45331 0.01359 2422 25 2417 31 2410 60 100.5 G8-72 268.40 236.05 1.14 0.10060 0.00275 3.61821 0.09063 0.26084 0.00505 1635 22 1554 20 1494 26 109.4 G8-73 178.19 334.03 0.53 0.06558 0.00205 1.05571 0.03015 0.11674 0.00204 793 32 732 15 712 12 102.8 G8-74 393.35 246.93 1.59 0.06099 0.00300 0.60597 0.02713 0.07205 0.00176 639 55 481 17 448 11 107.4 G8-75 412.44 469.83 0.88 0.05609 0.00220 0.56408 0.02029 0.07293 0.00142 456 46 454 13 454 9 100.0 G8-76 694.12 425.21 1.63 0.07039 0.00156 1.52474 0.03092 0.15708 0.00224 940 20 940 12 941 12 99.9 G8-77 275.18 323.15 0.85 0.11629 0.00202 5.46680 0.08809 0.34092 0.00498 1900 13 1895 14 1891 24 100.5 G8-78 154.83 313.36 0.49 0.15423 0.00255 9.42174 0.14768 0.44300 0.00688 2393 12 2380 14 2364 31 101.2 G8-79 23.67 417.95 0.06 0.05586 0.00260 0.55496 0.02365 0.07205 0.00162 447 56 448 15 448 10 100.0 G8-80 286.04 212.98 1.34 0.18549 0.00245 13.34156 0.17000 0.52161 0.00728 2703 10 2704 12 2706 31 99.9 G8-81 1169.12 1375.91 0.85 0.07240 0.00111 1.51282 0.02102 0.15153 0.00174 997 13 936 8 910 10 102.9 G8-82 398.72 510.47 0.78 0.06722 0.00135 1.28474 0.02351 0.13860 0.00181 845 18 839 10 837 10 100.2 G8-83 1698.56 1061.59 1.60 0.05652 0.00179 0.46431 0.01345 0.05957 0.00098 473 36 387 9 373 6 103.8 G8-84 205.56 256.63 0.80 0.06567 0.00218 1.19794 0.03650 0.13229 0.00246 796 34 800 17 801 14 99.9 G8-85 370.05 674.39 0.55 0.05554 0.00157 0.55353 0.01438 0.07227 0.00108 434 32 447 9 450 6 99.3 G8-86 29.58 36.31 0.81 0.04697 0.01135 0.62177 0.14617 0.09601 0.00540 48 402 491 92 591 32 83.1 G8-87 74.78 36.39 2.05 0.05496 0.01810 0.84859 0.27530 0.11199 0.00635 410 611 624 151 684 37 91.2 G8-88 961.99 1675.68 0.57 0.07088 0.00109 1.04328 0.01441 0.10675 0.00121 954 13 726 7 654 7 111.0 G8-89 283.91 278.33 1.02 0.06783 0.00242 1.33922 0.04383 0.14318 0.00283 863 37 863 19 863 16 100.0 G8-90 135.06 122.13 1.11 0.06648 0.00277 1.23952 0.04747 0.13520 0.00304 822 44 819 22 817 17 100.2 G8-91 141.40 164.86 0.86 0.24341 0.00307 21.06274 0.26568 0.62752 0.00911 3142 10 3141 12 3140 36 100.1 G8-92 272.17 283.46 0.96 0.15821 0.00200 10.00890 0.11978 0.45877 0.00591 2437 10 2436 11 2434 26 100.1 G8-93 757.11 965.14 0.78 0.05608 0.00343 0.53459 0.03165 0.06914 0.00108 456 140 435 21 431 6 100.9 G8-94 867.23 243.18 3.57 0.06303 0.00239 0.83532 0.02891 0.09611 0.00191 709 41 617 16 592 11 104.2 G8-95 1106.72 1696.40 0.65 0.07263 0.00131 0.97363 0.01582 0.09721 0.00120 1004 15 690 8 598 7 115.4 G8-96 338.46 439.54 0.77 0.06652 0.00149 1.24864 0.02568 0.13613 0.00190 823 21 823 12 823 11 100.0 G8-97 289.93 573.11 0.51 0.16387 0.00157 10.69450 0.09578 0.47329 0.00517 2496 8 2497 8 2498 23 99.9 G8-98 456.82 959.75 0.48 0.05691 0.00126 0.61013 0.01233 0.07775 0.00101 488 23 484 8 483 6 100.2 G8-99 216.16 244.92 0.88 0.05683 0.00254 0.60422 0.02470 0.07710 0.00169 485 52 480 16 479 10 100.2 G8-100 470.27 465.39 1.01 0.05600 0.00191 0.57032 0.01796 0.07386 0.00125 452 41 458 12 459 8 99.8 G8-101 474.07 743.48 0.64 0.11530 0.00133 3.93034 0.04055 0.24720 0.00271 1885 9 1620 8 1424 14 132.4 G8-102 424.04 700.07 0.61 0.07330 0.00189 1.70678 0.04029 0.16886 0.00271 1022 24 1011 15 1006 15 101.6 G8-103 224.12 511.49 0.44 0.05574 0.00203 0.56342 0.01889 0.07331 0.00131 442 43 454 12 456 8 99.6 G8-104 181.00 482.43 0.38 0.06883 0.00202 1.30131 0.03486 0.13710 0.00235 894 29 846 15 828 13 102.2 G8-105 414.04 669.66 0.62 0.06515 0.00128 1.16927 0.02102 0.13016 0.00166 779 18 786 10 789 9 99.6 G8-106 214.51 468.61 0.46 0.06668 0.00152 1.25780 0.02628 0.13681 0.00193 828 22 827 12 827 11 100.0 G8-107 336.22 955.63 0.35 0.12004 0.00155 5.86599 0.06999 0.35439 0.00427 1957 10 1956 10 1956 20 100.1 G8-108 262.15 401.75 0.65 0.07183 0.00159 1.62954 0.03290 0.16452 0.00235 981 20 982 13 982 13 100.0 G8-109 129.92 110.16 1.18 0.12859 0.00341 6.73217 0.16753 0.37968 0.00806 2079 20 2077 22 2075 38 100.2 G8-110 293.21 257.41 1.14 0.06760 0.00264 1.29115 0.04622 0.13852 0.00297 856 40 842 20 836 17 100.7 G8-111 352.06 503.76 0.70 0.06013 0.00242 0.56462 0.02073 0.06809 0.00138 608 45 455 13 425 8 107.1 G8-112 152.63 200.81 0.76 0.07291 0.00276 1.42655 0.04921 0.14191 0.00305 1011 37 900 21 855 17 105.3 G8-113 131.52 187.96 0.70 0.11894 0.00284 5.56174 0.12347 0.33913 0.00634 1940 18 1910 19 1882 31 103.1 G8-114 251.20 525.73 0.48 0.07324 0.00216 1.72497 0.04669 0.17081 0.00305 1021 28 1018 17 1017 17 100.4 G8-115 988.79 1639.06 0.60 0.06408 0.00141 0.48906 0.00972 0.05535 0.00073 744 21 404 7 347 4 116.4 G8-116 315.05 174.08 1.81 0.06495 0.00281 1.13564 0.04520 0.12680 0.00285 773 47 770 21 770 16 100.0 G8-117 520.28 438.25 1.19 0.17624 0.00202 9.98631 0.10609 0.41095 0.00496 2618 9 2434 10 2219 23 118.0 G8-118 1210.60 2135.02 0.57 0.11765 0.00123 2.19712 0.01983 0.13544 0.00138 1921 8 1180 6 819 8 144.1 G8-119 474.66 534.16 0.89 0.06678 0.00129 1.26680 0.02244 0.13758 0.00175 831 18 831 10 831 10 100.0 G8-120 779.36 1589.97 0.49 0.13208 0.00136 4.17041 0.03789 0.22901 0.00239 2126 8 1668 7 1329 13 160.0 G8-121 157.18 489.74 0.32 0.07660 0.00161 1.98728 0.03823 0.18817 0.00265 1111 18 1111 13 1111 14 100.0 G8-122 771.92 1989.11 0.39 0.05297 0.00177 0.29002 0.00885 0.03971 0.00065 328 40 259 7 251 4 103.2 G8-123 77.19 252.37 0.31 0.07598 0.00250 1.93387 0.05831 0.18460 0.00365 1095 31 1093 20 1092 20 100.3 G8-124 439.38 633.88 0.69 0.06909 0.00171 1.31639 0.02984 0.13819 0.00208 901 24 853 13 834 12 102.3 G8-125 167.12 321.28 0.52 0.10953 0.00199 4.84325 0.08171 0.32071 0.00470 1792 14 1792 14 1793 23 99.9 G8-126 272.03 581.53 0.47 0.06644 0.00161 1.24496 0.02768 0.13590 0.00199 820 24 821 13 821 11 100.0 G8-127 465.65 318.29 1.46 0.06472 0.00195 1.10924 0.03060 0.12430 0.00209 765 31 758 15 755 12 100.4 G8-128 138.78 250.56 0.55 0.05939 0.00335 0.57473 0.02967 0.07018 0.00189 581 66 461 19 437 11 105.5 G8-129 270.09 527.91 0.51 0.08105 0.00163 2.33546 0.04311 0.20901 0.00293 1223 17 1223 13 1224 16 99.9 G8-130 332.80 327.12 1.02 0.13192 0.00175 7.08375 0.08736 0.38949 0.00487 2124 10 2122 11 2120 23 100.2 G8-131 686.74 1452.42 0.47 0.06692 0.00154 0.95344 0.01994 0.10334 0.00144 835 22 680 10 634 8 107.3 G8-132 242.47 280.26 0.87 0.10326 0.00220 4.08355 0.08031 0.28685 0.00459 1684 17 1651 16 1626 23 103.6 G8-133 85.37 146.14 0.58 0.07198 0.00614 1.34405 0.10923 0.13542 0.00351 985 180 865 47 819 20 105.6 G8-134 523.85 735.45 0.71 0.05905 0.00214 0.56269 0.01866 0.06912 0.00128 569 41 453 12 431 8 105.1 G8-135 953.91 1199.78 0.80 0.12183 0.00118 4.29712 0.03722 0.25584 0.00258 1983 8 1693 7 1469 13 135.0 G8-136 113.00 219.26 0.52 0.06132 0.00246 0.91218 0.03369 0.10790 0.00221 650 45 658 18 661 13 99.5 G8-137 234.57 500.11 0.47 0.14896 0.00203 8.60252 0.11016 0.41889 0.00551 2334 10 2297 12 2255 25 103.5 表 3 四石厂剖面样品碎屑锆石Lu-Hf测定结果Table Supplementary Table Lu-Hf isotopic compositions of detrital zircons from Sishichang Profile样品 年龄(Ma) 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ 176Hf/177Hf(t) εHf(0) εHf(t) 2σ TDM(Ma) TDMC(Ma) fLu/Hf G8-1 1736 0.043433 0.000777 0.000955 0.000015 0.281448 0.000029 0.281416 -46.8 -9.3 1.0 2518 3023 -0.97 G8-2 431 0.086351 0.002160 0.001857 0.000049 0.282488 0.000035 0.282473 -10.0 -1.1 1.2 1105 1488 -0.94 G8-3 1977 0.037863 0.001038 0.000850 0.000023 0.281251 0.000026 0.281219 -53.8 -10.8 0.9 2778 3303 -0.97 G8-4 1203 0.058889 0.001203 0.001330 0.000030 0.281820 0.000023 0.281790 -33.7 -8.1 0.8 2027 2532 -0.96 G8-5 862 0.036347 0.000319 0.000771 0.000006 0.281839 0.000034 0.281826 -33.0 -14.4 1.2 1972 2664 -0.98 G8-6 2055 0.053166 0.000777 0.001152 0.000019 0.281495 0.000026 0.281450 -45.2 -0.8 0.9 2466 2734 -0.97 G8-8 816 0.083941 0.000608 0.001832 0.000017 0.281889 0.000038 0.281861 -31.2 -14.2 1.3 1958 2616 -0.94 G8-9 433 0.154276 0.001069 0.003652 0.000022 0.282535 0.000033 0.282505 -8.4 0.1 1.2 1091 1415 -0.89 G8-10 2450 0.029321 0.000121 0.000577 0.000003 0.280975 0.000030 0.280948 -63.6 -9.6 1.1 3129 3594 -0.98 G8-11 1995 0.070642 0.001973 0.001440 0.000044 0.281436 0.000037 0.281381 -47.2 -4.6 1.3 2566 2929 -0.96 G8-14 407 0.192146 0.003845 0.004228 0.000076 0.282975 0.000035 0.282943 7.2 15.0 1.2 429 439 -0.87 G8-15 813 0.063545 0.001186 0.001527 0.000038 0.281973 0.000027 0.281950 -28.3 -11.1 1.0 1824 2421 -0.95 G8-16 837 0.097396 0.002088 0.001727 0.000032 0.282497 0.000039 0.282470 -9.7 7.8 1.4 1088 1236 -0.95 G8-19 1186 0.105770 0.000836 0.002165 0.000021 0.282088 0.000028 0.282040 -24.2 0.4 1.0 1690 1982 -0.93 G8-23 1282 0.172407 0.002668 0.003792 0.000073 0.282256 0.000048 0.282165 -18.2 7.0 1.7 1516 1636 -0.89 G8-24 1834 0.026602 0.000580 0.000571 0.000016 0.281312 0.000020 0.281292 -51.6 -11.5 0.7 2676 3235 -0.98 G8-25 469 0.073703 0.001786 0.001934 0.000043 0.281910 0.000032 0.281893 -30.5 -20.8 1.1 1933 2752 -0.94 G8-26 1845 0.030683 0.000448 0.000660 0.000010 0.281354 0.000023 0.281331 -50.2 -9.9 0.8 2626 3142 -0.98 G8-27 617 0.094754 0.000919 0.002064 0.000017 0.282192 0.000034 0.282168 -20.5 -7.8 1.2 1538 2056 -0.94 G8-28 960 0.026403 0.000239 0.000597 0.000006 0.282117 0.000038 0.282106 -23.2 -2.3 1.3 1582 1980 -0.98 G8-30 1808 0.041449 0.000517 0.000919 0.000012 0.281549 0.000032 0.281517 -43.3 -4.1 1.1 2378 2749 -0.97 G8-31 460 0.078632 0.003314 0.001932 0.000073 0.282744 0.000038 0.282727 -1.0 8.5 1.3 739 897 -0.94 G8-32 475 0.102099 0.000252 0.002480 0.000012 0.282058 0.000050 0.282036 -25.3 -15.6 1.8 1749 2435 -0.93 G8-33 1546 0.246943 0.002195 0.005407 0.000048 0.281997 0.000047 0.281839 -27.4 1.4 1.7 1996 2199 -0.84 G8-35 1058 0.027364 0.000078 0.000625 0.000004 0.282027 0.000027 0.282015 -26.3 -3.4 1.0 1707 2122 -0.98 G8-36 862 0.047266 0.000276 0.001107 0.000006 0.281859 0.000031 0.281842 -32.3 -13.9 1.1 1961 2630 -0.97 G8-38 440 0.092821 0.002126 0.002272 0.000045 0.282572 0.000030 0.282554 -7.1 2.0 1.1 995 1302 -0.93 G8-39 467 0.076056 0.000455 0.001804 0.000015 0.282557 0.000045 0.282541 -7.6 2.1 1.6 1005 1314 -0.95 G8-40 873 0.056801 0.000975 0.001340 0.000020 0.282288 0.000030 0.282266 -17.1 1.4 1.1 1373 1675 -0.96 G8-41 793 0.160736 0.001068 0.003859 0.000032 0.282127 0.000045 0.282070 -22.8 -7.3 1.6 1713 2165 -0.88 G8-42 2157 0.041180 0.000687 0.000952 0.000018 0.281540 0.000047 0.281501 -43.6 3.3 1.7 2392 2547 -0.97 G8-43 1046 0.008928 0.000123 0.000112 0.000002 0.282137 0.000015 0.282135 -22.4 0.6 0.5 1534 1858 -1.00 G8-47 459 0.129884 0.000799 0.002956 0.000014 0.282314 0.000031 0.282289 -16.2 -7.0 1.1 1396 1883 -0.91 G8-48 491 0.046978 0.000526 0.001213 0.000020 0.281963 0.000032 0.281952 -28.6 -18.2 1.1 1823 2611 -0.96 G8-50 2023 0.078537 0.000944 0.001980 0.000020 0.281645 0.000027 0.281569 -39.8 2.7 1.0 2309 2485 -0.94 G8-51 868 0.061208 0.000591 0.001653 0.000019 0.282229 0.000022 0.282202 -19.2 -1.0 0.8 1467 1821 -0.95 G8-52 1828 0.039611 0.000228 0.000912 0.000005 0.281237 0.000041 0.281206 -54.3 -14.7 1.4 2801 3431 -0.97 G8-53 426 0.188594 0.001290 0.004204 0.000019 0.283086 0.000036 0.283053 11.1 19.3 1.3 256 175 -0.87 G8-54 1521 0.050421 0.000249 0.001244 0.000005 0.281876 0.000028 0.281840 -31.7 0.9 1.0 1945 2211 -0.96 G8-55 834 0.060797 0.001149 0.001585 0.000029 0.281892 0.000030 0.281867 -31.1 -13.6 1.1 1941 2592 -0.95 G8-56 2564 0.043418 0.000689 0.001052 0.000015 0.281177 0.000041 0.281125 -56.4 -0.7 1.5 2894 3115 -0.97 G8-57 657 0.123819 0.001111 0.002333 0.000021 0.282094 0.000038 0.282066 -24.0 -10.5 1.3 1689 2259 -0.93 G8-58 419 0.058517 0.001301 0.001363 0.000038 0.282334 0.000025 0.282323 -15.5 -6.7 0.9 1309 1832 -0.96 G8-59 842 0.059104 0.000896 0.001308 0.000020 0.282183 0.000018 0.282162 -20.8 -3.0 0.6 1520 1929 -0.96 G8-60 2624 0.022016 0.000197 0.000547 0.000006 0.280922 0.000024 0.280895 -65.4 -7.5 0.9 3196 3593 -0.98 G8-61 679 0.044763 0.001544 0.001100 0.000044 0.282390 0.000024 0.282376 -13.5 1.0 0.8 1221 1551 -0.97 G8-62 989 0.028949 0.000636 0.000629 0.000015 0.281858 0.000024 0.281846 -32.3 -10.9 0.9 1939 2541 -0.98 G8-63 843 0.054597 0.000512 0.001241 0.000011 0.282010 0.000040 0.281991 -26.9 -9.0 1.4 1758 2311 -0.96 G8-64 889 0.064048 0.000645 0.001652 0.000018 0.282313 0.000020 0.282286 -16.2 2.5 0.7 1348 1620 -0.95 G8-65 501 0.048003 0.000831 0.001079 0.000014 0.282538 0.000049 0.282528 -8.3 2.4 1.7 1013 1322 -0.97 G8-67 966 0.108626 0.002046 0.002220 0.000041 0.282432 0.000037 0.282392 -12.0 7.9 1.3 1197 1329 -0.93 G8-68 1855 0.067269 0.001459 0.001308 0.000034 0.281672 0.000025 0.281626 -38.9 0.9 0.9 2231 2471 -0.96 G8-69 1801 0.059913 0.000826 0.001368 0.000015 0.281723 0.000030 0.281676 -37.1 1.4 1.1 2164 2394 -0.96 G8-70 916 0.112666 0.000649 0.002464 0.000012 0.281946 0.000036 0.281903 -29.2 -10.5 1.3 1910 2460 -0.93 G8-71 2422 0.027002 0.000278 0.000558 0.000005 0.281160 0.000028 0.281134 -57.0 -3.6 1.0 2880 3194 -0.98 G8-73 712 0.154782 0.002056 0.003493 0.000036 0.282488 0.000043 0.282441 -10.1 4.0 1.5 1157 1383 -0.89 G8-74 448 0.062503 0.000913 0.001238 0.000020 0.282286 0.000041 0.282276 -17.2 -7.7 1.4 1371 1919 -0.96 G8-75 454 0.066108 0.001301 0.001584 0.000030 0.281816 0.000050 0.281803 -33.8 -24.3 1.8 2046 2958 -0.95 G8-76 941 0.068851 0.000625 0.001444 0.000007 0.282178 0.000031 0.282153 -21.0 -1.1 1.1 1531 1886 -0.96 G8-78 2393 0.033979 0.001030 0.000720 0.000026 0.281694 0.000026 0.281661 -38.1 14.4 0.9 2167 2013 -0.98 G8-79 448 0.018712 0.001659 0.000434 0.000040 0.282020 0.000020 0.282016 -26.6 -16.9 0.7 1708 2494 -0.99 G8-80 2703 0.092976 0.000579 0.002082 0.000013 0.281083 0.000045 0.280975 -59.7 -2.8 1.6 3104 3357 -0.94 G8-81 910 0.071978 0.001350 0.001573 0.000032 0.282493 0.000046 0.282466 -9.9 9.3 1.6 1090 1198 -0.95 G8-82 837 0.072007 0.001381 0.001715 0.000023 0.282038 0.000039 0.282011 -26.0 -8.4 1.4 1741 2270 -0.95 G8-83 373 0.154693 0.002161 0.003531 0.000049 0.282839 0.000045 0.282814 2.4 9.7 1.6 628 755 -0.89 G8-84 801 0.085298 0.000798 0.002020 0.000019 0.281998 0.000047 0.281968 -27.4 -10.8 1.7 1812 2388 -0.94 G8-85 450 0.042346 0.000538 0.000965 0.000011 0.282234 0.000017 0.282226 -19.0 -9.4 0.6 1434 2028 -0.97 G8-87 684 0.067044 0.001114 0.001636 0.000023 0.281846 0.000042 0.281825 -32.8 -18.4 1.5 2008 2775 -0.95 G8-90 817 0.040854 0.000361 0.000977 0.000011 0.281921 0.000032 0.281906 -30.1 -12.6 1.1 1870 2516 -0.97 G8-91 3142 0.051613 0.000439 0.001245 0.000006 0.280742 0.000027 0.280666 -71.8 -3.6 1.0 3499 3742 -0.96 G8-92 2437 0.058969 0.001284 0.001365 0.000027 0.281158 0.000028 0.281095 -57.1 -4.7 1.0 2943 3273 -0.96 G8-93 431 0.126391 0.001536 0.002849 0.000038 0.282742 0.000041 0.282719 -1.1 7.6 1.5 761 935 -0.91 G8-94 592 0.083102 0.001833 0.001897 0.000041 0.281815 0.000033 0.281794 -33.8 -21.6 1.2 2065 2897 -0.94 G8-96 823 0.153655 0.003264 0.004133 0.000074 0.282297 0.000043 0.282233 -16.8 -0.9 1.5 1469 1781 -0.88 G8-97 2496 0.076838 0.000364 0.001722 0.000011 0.280862 0.000026 0.280780 -67.5 -14.5 0.9 3378 3937 -0.95 G8-98 483 0.089761 0.000845 0.002230 0.000025 0.282364 0.000021 0.282343 -14.4 -4.5 0.7 1297 1747 -0.93 G8-99 479 0.042552 0.000483 0.001141 0.000011 0.282676 0.000024 0.282665 -3.4 6.8 0.9 819 1025 -0.97 G8-100 459 0.036841 0.000489 0.000882 0.000012 0.282474 0.000018 0.282466 -10.5 -0.7 0.7 1097 1487 -0.97 G8-102 1022 0.109357 0.000757 0.002397 0.000014 0.282519 0.000031 0.282473 -8.9 12.1 1.1 1076 1107 -0.93 G8-106 827 0.052863 0.002845 0.001243 0.000065 0.282049 0.000042 0.282030 -25.6 -8.0 1.5 1703 2233 -0.96 G8-107 1957 0.060687 0.001472 0.001405 0.000036 0.281526 0.000029 0.281473 -44.1 -2.2 1.0 2440 2747 -0.96 G8-108 982 0.093630 0.000653 0.002129 0.000017 0.282253 0.000038 0.282213 -18.4 2.0 1.3 1453 1723 -0.94 G8-110 836 0.060776 0.000902 0.001475 0.000021 0.281846 0.000042 0.281822 -32.8 -15.1 1.5 1999 2689 -0.96 G8-111 425 0.080838 0.000401 0.001981 0.000011 0.282493 0.000029 0.282478 -9.9 -1.1 1.0 1101 1482 -0.94 G8-116 770 0.130147 0.002037 0.003157 0.000035 0.282143 0.000035 0.282098 -22.2 -6.9 1.3 1656 2118 -0.90 G8-119 831 0.116095 0.003088 0.002831 0.000073 0.281794 0.000033 0.281750 -34.6 -17.8 1.2 2149 2852 -0.91 G8-121 1111 0.010109 0.000419 0.000272 0.000007 0.282251 0.000030 0.282246 -18.4 6.0 1.1 1385 1566 -0.99 G8-123 1095 0.096407 0.004000 0.002629 0.000151 0.282331 0.000049 0.282277 -15.6 6.8 1.8 1358 1505 -0.92 G8-124 834 0.070693 0.000860 0.001745 0.000022 0.281986 0.000028 0.281959 -27.8 -10.4 1.0 1816 2388 -0.95 G8-126 821 0.078862 0.003923 0.001620 0.000076 0.282324 0.000046 0.282299 -15.8 1.4 1.6 1332 1634 -0.95 G8-128 437 0.094123 0.000558 0.002116 0.000011 0.282301 0.000042 0.282284 -16.6 -7.6 1.5 1382 1908 -0.94 G8-129 1223 0.084444 0.007123 0.001766 0.000155 0.281983 0.000014 0.281942 -27.9 -2.2 0.5 1821 2177 -0.95 G8-130 2124 0.080416 0.001463 0.001972 0.000040 0.281509 0.000040 0.281429 -44.7 0.0 1.4 2500 2732 -0.94 G8-131 634 0.096055 0.002156 0.002254 0.000040 0.282394 0.000039 0.282367 -13.4 -0.3 1.4 1253 1599 -0.93 G8-132 1684 0.056122 0.001783 0.001307 0.000033 0.281885 0.000032 0.281844 -31.4 4.7 1.2 1935 2094 -0.96 G8-136 661 0.058031 0.000842 0.001305 0.000016 0.282470 0.000032 0.282454 -10.7 3.3 1.1 1115 1388 -0.96 
图 6 碎屑锆石年龄谐和图和年龄频谱图图a和图b为本文样品G8；图c和图d邹思远等(2013)Fig. 6. Concordia plots, histograms and relative probability plots of detrital zircons U-Pb ages
图 8 碎屑锆石典型锆石CL图图中圆圈代表原位测试点，直径为32μm.红色数字为U-Pb年龄，绿色数字为εHf(t)值Fig. 8. Typical CL images of detrital zircons
图 9 碎屑锆石Hf同位素特征a.本文碎屑锆石Hf同位素组成；b.文献中报道的Hf同位素数据汇总，据Long et al.(2010)、龙晓平等(2011)、Ge et al.(2012a, 2012b, 2013a, 2013b)和Lei et al.(2012)Fig. 9. Hf isotope data of detrital zircons3.2 测试结果
在样品G8的137个碎屑锆石中共获得119个有效U-Pb年龄(图 6).从年龄频谱图上看(图 6)，有效年龄集中分布在407~501Ma、755~873Ma、889~1129Ma、1792~2079Ma、2393~2496Ma等5个区间，该5个年龄段约占有效数据点的74.8%，其中主要区间为407~501Ma、755~873Ma.
锆石颗粒大部分呈柱状或圆柱状(图 8)，长为0.05~0.15mm，长宽比小于4:1，分选磨圆较好.结合Th/U比值(图 7)、CL图(图 8)，407~501Ma锆石颗粒均有明显的环带结构，显示出明显的岩浆起源特征.大部分755~873Ma、889~1129Ma锆石颗粒CL图也呈明显的环带，应为岩浆成因.而1792~2079Ma锆石颗粒显示两种特征，有振荡环带的锆石和均质、溶蚀、扇状分带锆石，显示锆石既有岩浆成因也有变质成因.而2393~2496Ma锆石颗粒大多显示出均质、溶蚀特点，绝大部分应为变质成因.
119个有效年龄数据中，共得到96个有效的Hf同位素分析结果(图 9).在5组年龄峰中，80%以上的755~873Ma、2393~2496Ma年龄组锆石εHf(t)小于0，说明该期锆石多为古老地壳重新熔融的产物.而407~501Ma、889~1129Ma锆石εHf(t)表现出较多的正值，说明虽然该期锆石大部分为古老地壳重熔的产物，但新生的地壳物质也显著增多.
4. 讨论
4.1 潜在物源区锆石年代学特征及构造热事件
研究表明，2500Ma左右发生了一次全球性的地壳增生事件(Zhao et al., 2002)，在全球多地都有这一期的岩浆记录(Shu et al., 2011).在塔里木盆地及周缘地区已获得部分该时期的年龄，主要分布在库鲁克塔格地区(龙晓平等, 2011; Shu et al., 2011).本文样品获得的2500Ma左右的锆石年龄峰可能正是这次地壳增生事件的记录.
1792~2079Ma年龄峰常与Columbia超大陆汇聚的构造热事件相关(Shu et al., 2011).该期构造事件在塔里木盆地内有着广泛的记录，是塔里木盆地重要的地壳增生和岩浆事件，目前该期年龄的结晶岩主要出露在库鲁克塔格和塔西南铁克里克(王超, 2011; Zhang et al., 2012).
889~1129Ma年龄峰比Greenville造山事件略晚，常与Rodinia超大陆汇聚事件相关(Shu et al., 2011).该期构造事件在塔里木盆地内分布较少，主要出露在盆地腹部、库鲁克塔格地区(Li et al., 2005; Shu et al., 2011)，目前盆地内已发表的该阶段年龄相对概率很低(Zhang et al., 2013).昆仑造山带目前还没有发现该期年龄(毕华等, 1999)，阿尔金造山带也不存在大量的该期岩浆事件.
研究表明，新元古代期间发生的Rodinia超大陆裂解事件在塔里木盆地留下大量的印记，在盆地腹部、库鲁克塔格、阿克苏、铁克里克等都广泛分布有双峰式火山、基性岩墙群、碱性花岗岩等，并伴随着“雪球”事件和冰碛岩(Shu et al., 2011;王超, 2011).这次裂解事件的持续时间为680~840Ma(Shu et al., 2011)，这一时间范围与本文样品碎屑锆石755~873Ma年龄峰基本吻合.
早古生代岩浆活动广泛发育于塔里木盆地及周缘造山带中(高俊等, 2009;陈宣华等, 2009)，主要与昆仑洋、阿尔金洋、Terskey洋、南天山洋的俯冲闭合造山有关(高俊等, 2006, 2009).前人对周缘多个造山带该期结晶岩U-Pb年龄进行了诸多统计(彭守涛, 2007；李忠和彭守涛, 2013;郭春涛, 2014)(图 10)，西昆仑造山带、阿尔金造山带结晶岩年龄主要集中于430Ma以上，而中天山造山带、南天山造山带结晶岩年龄大部分小于440Ma.近年来发现的塔里木盆地东北缘岛弧结晶岩年龄主要集中于387~458Ma(朱志新等, 2008; Ge et al., 2012a; Lin et al., 2013;贾晓亮等, 2013;郭瑞清等, 2013)(图 11a).
图 10 塔里木盆地周缘造山带古生代结晶岩U-Pb年龄直方图Fig. 10. The U-Pb isotopic age histograms of the Paleozoic crystalline rocks of the orogenic belts adjacent to the Tarim basin
图 11 样品与潜在物源区构造热事件年龄对比a.塔里木盆地已发表前二叠纪结晶岩频谱图(Zhang et al., 2013；郭春涛, 2014；李忠等, 2015)；b.柯坪地区乌什剖面上石炭统样品G4碎屑锆石(郭春涛等, 2015)；c.本文碎屑锆石样品；d.柯坪地区大湾沟库普库兹满组碎屑锆石(邹思远等, 2013)Fig. 11. Comparison of the ages between the samples and possible source areas4.2 物源体系
4.2.1 塔里木盆地物源区
图 11为本文样品碎屑锆石U-Pb年龄与潜在物源区的年龄对比图.不难看出，本文样品的年龄分布特征与塔里木盆地基底的构造热事件年龄吻合度较高，都存在明显的~800Ma、~1800Ma、~2500Ma的峰值年龄，说明盆地内古隆起可能是潜在的物源区.
近些年，国内外学者对塔里木盆地出露的前寒武系结晶岩和变质岩进行了诸多Hf同位素特征研究(Long et al., 2010;龙晓平等, 2011; Ge et al., 2012a, 2012b, 2013a, 2013b; Lei et al., 2012)(图 9).图 9显示，G8样品中407~501Ma、755~873Ma年龄锆石的εHf(t)与文献中报道的εHf(t)特征基本一致，大部分为负值，少量为正值，二阶段模式年龄大部分小于2.5Ga；1792~2079Ma、2393~2496Ma年龄锆石的εHf(t)正值、负值均有，且比较散乱，二阶段模式年龄大部分小于3.5Ga，与文献中报道的εHf(t)特征基本一致.889~1129Ma年龄锆石的εHf(t)正值、负值均有，以正值为主，前文分析了该期年龄在塔里木盆地出露较少(Zhang et al., 2013)，所以文献中报道的该年龄段的εHf(t)非常少.从图中可知，康克林组碎屑锆石εHf(t)特征总体与塔里木基底结晶岩的εHf(t)相似，说明研究区物源可能是盆内的古隆起.
碎屑组分和重矿物方面.碎屑组分样品基本都落入陆块物源区和成熟岩石与稳定构架合并处，说明研究区的物源主要为成熟的克拉通物质，来自塔里木盆地内部.重矿物组合显示稳定重矿物占优势，不含不稳定重矿物，源区母岩类型以沉积岩和低级变质岩为主.而古流向显示物源主要来自偏南方(Carroll et al., 1995, 2001).这一切均印证了盆地内古隆起作为物源区的可能性.
4.2.2 西昆仑造山带、阿尔金造山带物源区
虽然早二叠世南天山洋可能已经闭合(王作勋等, 1990;郝杰和刘小汉, 1993；高俊等, 2006, 2009; Charvet et al., 2007)，但样品碎屑组分和重矿物均不支持有来自北侧造山带的信息(图 2，图 5).同时，南天山造山带、中天山造山带、塔里木北缘东部岛弧结晶岩U-Pb年龄分布偏小(图 10，图 11a)，有大量的小于420Ma的结晶岩，而样品碎屑锆石中基本不含小于420Ma的年龄，碎屑锆石特征也不支持有来自北侧造山带的物源.
年代学对比不能排除来自阿尔金和西昆仑再旋回沉积的可能性，特别是研究地层中发现有大量的407~501Ma的碎屑锆石，这并非塔里木陆块结晶岩物源所能解释的，而这与已经揭示的400~500Ma阿尔金和西昆仑岩浆-变质地体可以对比(图 10)，他们可能在晚泥盆世之前就堆积在塔里木陆块(李忠等, 2015)，以致志留系(Liu et al., 2012)、泥盆系(Liu et al., 2012;郭春涛, 2014)、石炭系(图 11b)、二叠系(图 11c)含有大量的400~500Ma的碎屑锆石，之后再剥蚀、搬运至研究区.
综上所述，四石厂地区下二叠统康克林组砂岩的物源主要为塔里木盆地内的古隆起，同时还可能有来自阿尔金造山带、西昆仑造山带再旋回沉积的贡献.
4.3 南天山造山带隆升时间
虽然关于南天山洋洋盆闭合时间的争议很大(郝杰和刘小汉, 1993;高长林等, 1995;高俊等, 2006, 2009; Charvet et al., 2007; Zhang et al., 2007)，然而早-中泥盆世的结论年代久远，新的放射虫资料已否定该论断(Wang et al., 2011)；二叠纪末-三叠纪初的结论来源于数据的误判(高俊等)；郝杰和刘小汉(1993)并没有确凿的证据支持晚石炭世-早二叠世.实际上，越来越多的证据表明其闭合于晚泥盆-早石炭世(Carroll et al., 1995；高俊等, 2006, 2009; Charvet et al., 2007; Wang et al., 2011)，特别是造山带高压增生楔内榴辉岩的峰期变质年龄(高俊等, 2006, 2009)、放射虫最小年龄(Wang et al., 2011).然而直至早二叠世紧邻南天山的四石厂地区物源依然以盆内古隆起为主，没有记录到造山事件的沉积学响应，说明虽然洋盆已经闭合，但可能并没有隆升造山，洋盆闭合事件对塔里木盆地西北缘构造格局和物源体系影响较小.
邹思远等(2013)对柯坪地区印干村大湾沟剖面(图 1b)的沉积岩层进行了碎屑锆石U-Pb定年测试.样品Yg050413取自开派兹雷克组最下层玄武岩与库普库兹满组最上层玄武岩之间的厚层沉积岩，岩性为粉砂岩，详细取样及测试见邹思远等(2013).前人对开派兹雷克组玄武岩进行了众多研究，其年龄主要集中于288.4Ma、272.9Ma、287.2Ma(Li et al., 2011)、288.9Ma(Yu et al., 2011).邹思远等(2013)通过研究碎屑锆石认为大湾开派兹雷克组的火成岩的持续时间为291~284Ma，而样品Yg050413取自开派兹雷克组最底层玄武岩之下，所以其时代应为早二叠世萨克马尔期或更早.
Yg050413测试结果见图 6、图 11d，锆石年龄主要可分为4组：266~301Ma、313~400Ma、407~498Ma、736~851Ma.266~301Ma年龄组所占比例最大，可能来源于更早时间喷发的库普库兹满组玄武岩(邹思远等, 2013).
313~400Ma年龄组约占总有效数据的13%，邹思远等(2013)并没有探讨该部分锆石的来源.塔里木盆地、阿尔金造山带内部几乎不存在300~400Ma的构造热事件，相应地该期结晶岩极少分布(图 10).石炭纪-二叠纪西昆仑地区为古特提斯洋(毕华等, 1999)，该期结晶岩少有揭露.古地理特征上，也不支持有来自西昆仑、阿尔金地区的物源.
南天山造山带、中天山造山带可能成为313~400Ma年龄组的潜在物源区.在伊犁-中天山地块南缘、塔里木北缘发育一系列与俯冲闭合有关的结晶岩，南天山造山带内结晶岩年龄主要集中于290~350Ma、360~450Ma，中天山造山带内结晶岩年龄主要集中于290~370Ma、370~460Ma(图 10).早二叠世萨克马尔期，闭合后的南天山洋可能隆升造山，这些结晶岩逐渐成为塔里木西北缘的重要物源.
407~498Ma年龄组峰值为422Ma，邹思远等(2013)认为其来自之前地层的剥蚀.但其与柯坪地区志留系(Liu et al., 2012)、泥盆系(Liu et al., 2012;郭春涛, 2014)、石炭系(郭春涛, 2014；郭春涛等，2015)(图 11b)、二叠系(郭春涛, 2014)(图 11c)碎屑锆石同期年龄峰相比明显偏小，也比阿尔金造山带、西昆仑造山带结晶岩年龄整体偏小(图 10)，显示其可能另有物源区，可能为南天山造山带、中天山造山带(图 10)，与313~400Ma年龄组具有一致的物源区.
同时，开派兹雷克组之下的库普库兹满组沉积环境为陆相，古流向为西北方向，显示有来自天山造山带的物源(Carroll et al., 2001).碎屑组分以酸性喷出岩岩屑、棱角状单晶石英和钾长石为主(Carroll et al., 2001)，Dickinson三角图投点基本都落入岛弧物源区(图 5)，其物源应以岩浆弧物源区为主，可能为闭合造山后的南天山(Carroll et al., 2001).因此，库普库兹满组砂岩可能具有盆地和造山带双重物源.
物源结构的显著转变昭示了构造格局的巨大变革.虽然南天山洋可能在早石炭世已经闭合，但直到早二叠世阿瑟尔期仍然没有大规模隆升.直至萨克马尔期，才可能开始隆升并成为塔里木盆地西北缘的一个重要物源区.康克林组至开派兹雷克组完整地记录了这次转变事件.
5. 结论
(1) 下二叠统四石厂地区康克林组砂岩碎屑锆石定年结果显示5组年龄：407~501Ma、755~873Ma、889~1129Ma、1792~2079Ma、2393~2496Ma，主要反映了5期构造热事件.
(2) 下二叠统康克林组物源以塔里木盆内古隆起为主物源，同时盆地内与昆仑造山带、阿尔金造山带相关的前二叠纪沉积的剥蚀，也可能是一个重要的物源区.
(3) 早二叠世从阿瑟尔期至萨克马尔期，柯坪地区的物源结构发生重大变化，由盆地内古隆起单一物源转变为盆内和造山带双重物源.已经闭合的南天山洋在萨克马尔期开始隆升造山，成为塔里木西北缘的一个重要物源区.
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图 1 四石厂地区地质简图及碎屑锆石样品位置
Fig. 1. Geological sketch map of Sishichang area and the position of detrial zircon samples
图 2 四石厂康克林组剖面柱状图及样品采集
据周志毅等(2001)修改
Fig. 2. The depositional column of Kangkelin Formation and position of samples in the Sishichang outcrop
图 3 康克林组砂岩镜下特征
Q.总的石英；Qm.单晶石英；Qp.多晶石英；F.总的长石；K.钾长石；P.斜长石；Lv.(变质)结晶岩岩屑；Ls.(变质)沉积岩岩屑；Lt.总岩屑；L.不稳定复晶岩屑
Fig. 3. Microscopic features of sandstones of the Kangkelin Formation
图 4 四石厂剖面主要岩性和沉积构造
a.克兹尔塔格组与康克林组之间不整合接触；b.康克林组底砾岩；c.楔状体和平行层理；d.双向交错层理；e.分选磨圆较差砾岩；f.水下河道；g.生物碎屑；h.化石；i.薄层状灰岩
Fig. 4. Lithologic and sedimentary structure photographs of the Sishichang outcrop
图 5 砂岩碎屑组分与物源类型三角图
底图据Dickinson and Suczek(1979).1.本文康克林组样品；2.康克林组样品，据Carroll et al.(2001)；3.库普库兹满组样品，据Carroll et al.(2001).Q.总的石英；Qm.单晶石英；Qp.多晶石英；F.总的长石；K.钾长石；P.斜长石；Lv.(变质)结晶岩岩屑；Ls.(变质)沉积岩岩屑；Lt.总岩屑；L.不稳定复晶岩屑
Fig. 5. Triangular plots showing sandstone fragment components and provenance
图 6 碎屑锆石年龄谐和图和年龄频谱图
图a和图b为本文样品G8；图c和图d邹思远等(2013)
Fig. 6. Concordia plots, histograms and relative probability plots of detrital zircons U-Pb ages
图 8 碎屑锆石典型锆石CL图
图中圆圈代表原位测试点，直径为32μm.红色数字为U-Pb年龄，绿色数字为εHf(t)值
Fig. 8. Typical CL images of detrital zircons
图 9 碎屑锆石Hf同位素特征
a.本文碎屑锆石Hf同位素组成；b.文献中报道的Hf同位素数据汇总，据Long et al.(2010)、龙晓平等(2011)、Ge et al.(2012a, 2012b, 2013a, 2013b)和Lei et al.(2012)
Fig. 9. Hf isotope data of detrital zircons
图 10 塔里木盆地周缘造山带古生代结晶岩U-Pb年龄直方图
据彭守涛(2007)、李忠和彭守涛(2013)、郭春涛(2014).a.西昆仑造山带；b.阿尔金造山带；c.中天山造山带；d.南天山造山带
Fig. 10. The U-Pb isotopic age histograms of the Paleozoic crystalline rocks of the orogenic belts adjacent to the Tarim basin
图 11 样品与潜在物源区构造热事件年龄对比
a.塔里木盆地已发表前二叠纪结晶岩频谱图(Zhang et al., 2013；郭春涛, 2014；李忠等, 2015)；b.柯坪地区乌什剖面上石炭统样品G4碎屑锆石(郭春涛等, 2015)；c.本文碎屑锆石样品；d.柯坪地区大湾沟库普库兹满组碎屑锆石(邹思远等, 2013)
Fig. 11. Comparison of the ages between the samples and possible source areas
表 1 康克林组砂岩重矿物统计
Table 1. Heavy mineral statistics of sandstone samples in the Sishichang outcrop
样品 锆石 白钛石 金红石 锐钛矿 电气石 重晶石 铬尖晶石 AK1-06 70.0 8.3 5.4 5.4 9.3 0.5 1.2 AK2-16 75.8 6.5 1.6 0.4 11.6 4.0 0.1 注：重矿物含量为体积百分比，%. 
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表 2 四石厂剖面样品碎屑锆石U-Pb年龄测定结果
Table 2. U-Pb isotopic compositions of detrital zircons from Sishichang Profile
测试点 Th
(10-6)U
(10-6)Th/
U同位素比值 表面年龄(Ma) 谐和度
(%)207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 207Pb/206Pb ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ G8-1 233.21 492.81 0.47 0.10626 0.00148 4.51169 0.05793 0.30811 0.00386 1736 11 1733 11 1731 19 100.3 G8-2 1408.49 729.89 1.93 0.05554 0.00169 0.52870 0.01468 0.06908 0.00112 434 34 431 10 431 7 100.0 G8-3 83.09 139.42 0.60 0.12140 0.00231 5.99561 0.10612 0.35838 0.00574 1977 14 1975 15 1974 27 100.2 G8-4 83.77 282.21 0.30 0.08024 0.00178 2.26454 0.04591 0.20479 0.00312 1203 19 1201 14 1201 17 100.2 G8-5 190.28 344.28 0.55 0.07002 0.00176 1.38062 0.03164 0.14307 0.00221 929 24 881 13 862 12 102.2 G8-6 278.18 561.14 0.50 0.12688 0.00151 6.57148 0.07254 0.37585 0.00451 2055 9 2056 10 2057 21 99.9 G8-7 465.64 584.74 0.80 0.07730 0.00524 2.08761 0.13783 0.19586 0.00297 1129 139 1145 45 1153 16 97.9 G8-8 361.05 719.54 0.50 0.06637 0.00128 1.23448 0.02180 0.13496 0.00176 818 18 816 10 816 10 100.0 G8-9 570.87 525.21 1.09 0.05848 0.00182 0.56052 0.01591 0.06955 0.00115 548 34 452 10 433 7 104.4 G8-10 327.18 222.29 1.47 0.15947 0.00209 10.16686 0.12589 0.46262 0.00623 2450 10 2450 11 2451 27 100.0 G8-11 130.12 362.01 0.36 0.12263 0.00163 6.11968 0.07555 0.36211 0.00458 1995 10 1993 11 1992 22 100.2 G8-12 12961.52 1989.66 6.51 0.50744 0.01861 26.00374 0.82490 0.37184 0.01453 4263 26 3347 31 2038 68 209.2 G8-13 227.67 669.36 0.34 0.20167 0.00169 15.38139 0.12291 0.55340 0.00601 2840 8 2839 8 2839 25 100.0 G8-14 332.48 488.32 0.68 0.05488 0.00190 0.49291 0.01573 0.06516 0.00113 407 41 407 11 407 7 100.0 G8-15 257.89 392.33 0.66 0.06624 0.00147 1.22772 0.02494 0.13448 0.00189 814 21 813 11 813 11 100.0 G8-16 703.57 814.70 0.86 0.06944 0.00118 1.32745 0.02053 0.13869 0.00170 912 15 858 9 837 10 102.5 G8-17 847.47 1245.67 0.68 0.16308 0.00153 7.64361 0.06471 0.34005 0.00368 2488 8 2190 8 1887 18 131.8 G8-18 510.95 1047.06 0.49 0.07007 0.00210 1.12066 0.03045 0.11604 0.00204 930 29 763 15 708 12 107.8 G8-19 383.51 689.66 0.56 0.07955 0.00197 2.20132 0.04962 0.20077 0.00332 1186 21 1181 16 1179 18 100.6 G8-20 976.05 1184.89 0.82 0.06973 0.00127 0.99041 0.01629 0.10305 0.00129 920 16 699 8 632 8 110.6 G8-21 487.79 1169.08 0.42 0.08618 0.00129 2.74711 0.03745 0.23127 0.00282 1342 12 1341 10 1341 15 100.1 G8-22 338.59 234.45 1.44 0.08499 0.00281 2.66630 0.08095 0.22761 0.00486 1315 29 1319 22 1322 26 99.5 G8-23 243.06 682.05 0.36 0.08353 0.00126 2.51053 0.03474 0.21805 0.00265 1282 12 1275 10 1272 14 100.8 G8-24 89.36 105.81 0.84 0.11213 0.00344 4.95293 0.14056 0.32046 0.00731 1834 23 1811 24 1792 36 102.3 G8-25 270.31 577.58 0.47 0.05738 0.00202 0.59641 0.01922 0.07541 0.00138 506 40 475 12 469 8 101.3 G8-26 54.76 57.02 0.96 0.11280 0.00383 5.14837 0.16236 0.33110 0.00828 1845 26 1844 27 1844 40 100.1 G8-27 807.55 1183.92 0.68 0.06745 0.00124 0.93432 0.01559 0.10049 0.00125 852 16 670 8 617 7 108.6 G8-28 718.39 794.14 0.90 0.07020 0.00126 1.55443 0.02547 0.16063 0.00204 934 16 952 10 960 11 99.2 G8-29 1012.39 1144.38 0.88 0.11985 0.00277 4.77429 0.09542 0.28891 0.00334 1954 42 1780 17 1636 17 119.4 G8-30 151.63 202.69 0.75 0.11050 0.00201 4.93474 0.08286 0.32395 0.00484 1808 14 1808 14 1809 24 99.9 G8-31 611.26 784.49 0.78 0.05649 0.00172 0.57609 0.01613 0.07397 0.00119 472 34 462 10 460 7 100.4 G8-32 414.23 728.24 0.57 0.05685 0.00156 0.59881 0.01501 0.07641 0.00116 486 30 476 10 475 7 100.2 G8-33 306.61 1341.56 0.23 0.09590 0.00141 3.49932 0.04715 0.26471 0.00329 1546 11 1527 11 1514 17 102.1 G8-34 674.50 1762.35 0.38 0.14979 0.00138 7.37290 0.06163 0.35706 0.00379 2344 8 2158 7 1968 18 119.1 G8-35 120.84 169.78 0.71 0.07462 0.00208 1.82173 0.04664 0.17709 0.00305 1058 26 1053 17 1051 17 100.7 G8-36 93.97 121.25 0.78 0.06890 0.00318 1.35907 0.05792 0.14309 0.00349 896 49 871 25 862 20 101.0 G8-37 149.66 407.67 0.37 0.06767 0.00142 1.34025 0.02565 0.14366 0.00195 858 19 863 11 865 11 99.8 G8-38 763.08 825.27 0.92 0.05635 0.00127 0.54913 0.01130 0.07069 0.00093 466 24 444 7 440 6 100.9 G8-39 253.13 427.29 0.59 0.05627 0.00173 0.58216 0.01646 0.07505 0.00120 463 35 466 11 467 7 99.8 G8-40 187.37 420.25 0.45 0.06814 0.00130 1.36243 0.02370 0.14504 0.00187 873 17 873 10 873 11 100.0 G8-41 414.62 347.26 1.19 0.06520 0.00167 1.17602 0.02760 0.13083 0.00200 781 25 789 13 793 11 99.5 G8-42 138.27 309.76 0.45 0.13442 0.00260 7.36128 0.13370 0.39721 0.00668 2157 14 2156 16 2156 31 100.0 G8-43 259.95 860.48 0.30 0.07417 0.00120 1.79655 0.02642 0.17570 0.00213 1046 13 1044 10 1043 12 100.3 G8-44 1163.24 1277.92 0.91 0.17754 0.00145 10.19038 0.07604 0.41632 0.00428 2630 8 2452 7 2244 19 117.2 G8-45 613.51 1799.10 0.34 0.15229 0.00130 7.56765 0.05872 0.36042 0.00370 2372 8 2181 7 1984 18 119.6 G8-46 199.35 414.69 0.48 0.07104 0.00446 0.82503 0.04880 0.08423 0.00178 959 132 611 27 521 11 117.3 G8-47 235.14 554.28 0.42 0.05614 0.00171 0.57078 0.01591 0.07374 0.00118 458 34 459 10 459 7 100.0 G8-48 203.60 548.86 0.37 0.05730 0.00194 0.62465 0.01935 0.07907 0.00139 503 38 493 12 491 8 100.4 G8-49 732.58 459.59 1.59 0.07325 0.00229 1.16460 0.03287 0.11531 0.00211 1021 29 784 15 704 12 111.4 G8-50 440.06 850.33 0.52 0.12458 0.00155 6.35098 0.07305 0.36974 0.00447 2023 10 2026 10 2028 21 99.8 G8-51 343.12 529.69 0.65 0.06780 0.00133 1.34728 0.02409 0.14413 0.00188 862 18 866 10 868 11 99.8 G8-52 259.26 294.57 0.88 0.11174 0.00187 5.06593 0.07854 0.32880 0.00465 1828 13 1830 13 1833 23 99.7 G8-53 761.56 847.29 0.90 0.05564 0.00179 0.52473 0.01548 0.06839 0.00115 438 37 428 10 426 7 100.5 G8-54 226.20 319.87 0.71 0.09464 0.00217 3.29883 0.06947 0.25279 0.00418 1521 18 1481 16 1453 22 104.7 G8-55 370.65 704.12 0.53 0.06630 0.00210 1.26315 0.03658 0.13818 0.00250 816 32 829 16 834 14 99.4 G8-56 187.96 338.93 0.55 0.17065 0.00210 11.52206 0.13515 0.48969 0.00639 2564 10 2566 11 2569 28 99.8 G8-57 283.06 284.86 0.99 0.06156 0.00235 0.91100 0.03192 0.10734 0.00217 659 42 658 17 657 13 100.2 G8-58 169.59 119.37 1.42 0.05810 0.00446 0.53776 0.03805 0.06712 0.00232 534 95 437 25 419 14 104.3 G8-59 661.03 1178.81 0.56 0.06709 0.00100 1.29062 0.01754 0.13953 0.00157 841 13 842 8 842 9 100.0 G8-60 141.02 127.26 1.11 0.17687 0.00378 12.20401 0.25173 0.50041 0.01010 2624 16 2620 19 2616 43 100.3 G8-61 169.83 284.87 0.60 0.06210 0.00202 0.95146 0.02825 0.11111 0.00199 678 34 679 15 679 12 100.0 G8-62 463.01 701.82 0.66 0.07220 0.00115 1.65088 0.02401 0.16583 0.00197 992 13 990 9 989 11 100.1 G8-63 465.10 471.32 0.99 0.06684 0.00147 1.28751 0.02594 0.13971 0.00194 833 21 840 12 843 11 99.6 G8-64 299.36 348.51 0.86 0.06855 0.00191 1.39732 0.03579 0.14782 0.00243 885 27 888 15 889 14 99.9 G8-65 221.67 132.56 1.67 0.05762 0.00348 0.64196 0.03569 0.08079 0.00228 515 73 504 22 501 14 100.6 G8-66 217.13 296.64 0.73 0.05656 0.00262 0.58322 0.02490 0.07478 0.00166 474 56 467 16 465 10 100.4 G8-67 819.17 1043.75 0.78 0.07377 0.00132 1.64476 0.02676 0.16170 0.00205 1035 15 988 10 966 11 102.3 G8-68 208.72 1064.28 0.20 0.11344 0.00102 5.21484 0.04278 0.33339 0.00337 1855 8 1855 7 1855 16 100.0 G8-69 218.90 654.61 0.33 0.11010 0.00115 4.89341 0.04687 0.32232 0.00345 1801 9 1801 8 1801 17 100.0 G8-70 232.62 236.03 0.99 0.06975 0.00250 1.46819 0.04822 0.15266 0.00313 921 36 917 20 916 18 100.1 G8-71 42.86 41.98 1.02 0.15688 0.00551 9.80650 0.32929 0.45331 0.01359 2422 25 2417 31 2410 60 100.5 G8-72 268.40 236.05 1.14 0.10060 0.00275 3.61821 0.09063 0.26084 0.00505 1635 22 1554 20 1494 26 109.4 G8-73 178.19 334.03 0.53 0.06558 0.00205 1.05571 0.03015 0.11674 0.00204 793 32 732 15 712 12 102.8 G8-74 393.35 246.93 1.59 0.06099 0.00300 0.60597 0.02713 0.07205 0.00176 639 55 481 17 448 11 107.4 G8-75 412.44 469.83 0.88 0.05609 0.00220 0.56408 0.02029 0.07293 0.00142 456 46 454 13 454 9 100.0 G8-76 694.12 425.21 1.63 0.07039 0.00156 1.52474 0.03092 0.15708 0.00224 940 20 940 12 941 12 99.9 G8-77 275.18 323.15 0.85 0.11629 0.00202 5.46680 0.08809 0.34092 0.00498 1900 13 1895 14 1891 24 100.5 G8-78 154.83 313.36 0.49 0.15423 0.00255 9.42174 0.14768 0.44300 0.00688 2393 12 2380 14 2364 31 101.2 G8-79 23.67 417.95 0.06 0.05586 0.00260 0.55496 0.02365 0.07205 0.00162 447 56 448 15 448 10 100.0 G8-80 286.04 212.98 1.34 0.18549 0.00245 13.34156 0.17000 0.52161 0.00728 2703 10 2704 12 2706 31 99.9 G8-81 1169.12 1375.91 0.85 0.07240 0.00111 1.51282 0.02102 0.15153 0.00174 997 13 936 8 910 10 102.9 G8-82 398.72 510.47 0.78 0.06722 0.00135 1.28474 0.02351 0.13860 0.00181 845 18 839 10 837 10 100.2 G8-83 1698.56 1061.59 1.60 0.05652 0.00179 0.46431 0.01345 0.05957 0.00098 473 36 387 9 373 6 103.8 G8-84 205.56 256.63 0.80 0.06567 0.00218 1.19794 0.03650 0.13229 0.00246 796 34 800 17 801 14 99.9 G8-85 370.05 674.39 0.55 0.05554 0.00157 0.55353 0.01438 0.07227 0.00108 434 32 447 9 450 6 99.3 G8-86 29.58 36.31 0.81 0.04697 0.01135 0.62177 0.14617 0.09601 0.00540 48 402 491 92 591 32 83.1 G8-87 74.78 36.39 2.05 0.05496 0.01810 0.84859 0.27530 0.11199 0.00635 410 611 624 151 684 37 91.2 G8-88 961.99 1675.68 0.57 0.07088 0.00109 1.04328 0.01441 0.10675 0.00121 954 13 726 7 654 7 111.0 G8-89 283.91 278.33 1.02 0.06783 0.00242 1.33922 0.04383 0.14318 0.00283 863 37 863 19 863 16 100.0 G8-90 135.06 122.13 1.11 0.06648 0.00277 1.23952 0.04747 0.13520 0.00304 822 44 819 22 817 17 100.2 G8-91 141.40 164.86 0.86 0.24341 0.00307 21.06274 0.26568 0.62752 0.00911 3142 10 3141 12 3140 36 100.1 G8-92 272.17 283.46 0.96 0.15821 0.00200 10.00890 0.11978 0.45877 0.00591 2437 10 2436 11 2434 26 100.1 G8-93 757.11 965.14 0.78 0.05608 0.00343 0.53459 0.03165 0.06914 0.00108 456 140 435 21 431 6 100.9 G8-94 867.23 243.18 3.57 0.06303 0.00239 0.83532 0.02891 0.09611 0.00191 709 41 617 16 592 11 104.2 G8-95 1106.72 1696.40 0.65 0.07263 0.00131 0.97363 0.01582 0.09721 0.00120 1004 15 690 8 598 7 115.4 G8-96 338.46 439.54 0.77 0.06652 0.00149 1.24864 0.02568 0.13613 0.00190 823 21 823 12 823 11 100.0 G8-97 289.93 573.11 0.51 0.16387 0.00157 10.69450 0.09578 0.47329 0.00517 2496 8 2497 8 2498 23 99.9 G8-98 456.82 959.75 0.48 0.05691 0.00126 0.61013 0.01233 0.07775 0.00101 488 23 484 8 483 6 100.2 G8-99 216.16 244.92 0.88 0.05683 0.00254 0.60422 0.02470 0.07710 0.00169 485 52 480 16 479 10 100.2 G8-100 470.27 465.39 1.01 0.05600 0.00191 0.57032 0.01796 0.07386 0.00125 452 41 458 12 459 8 99.8 G8-101 474.07 743.48 0.64 0.11530 0.00133 3.93034 0.04055 0.24720 0.00271 1885 9 1620 8 1424 14 132.4 G8-102 424.04 700.07 0.61 0.07330 0.00189 1.70678 0.04029 0.16886 0.00271 1022 24 1011 15 1006 15 101.6 G8-103 224.12 511.49 0.44 0.05574 0.00203 0.56342 0.01889 0.07331 0.00131 442 43 454 12 456 8 99.6 G8-104 181.00 482.43 0.38 0.06883 0.00202 1.30131 0.03486 0.13710 0.00235 894 29 846 15 828 13 102.2 G8-105 414.04 669.66 0.62 0.06515 0.00128 1.16927 0.02102 0.13016 0.00166 779 18 786 10 789 9 99.6 G8-106 214.51 468.61 0.46 0.06668 0.00152 1.25780 0.02628 0.13681 0.00193 828 22 827 12 827 11 100.0 G8-107 336.22 955.63 0.35 0.12004 0.00155 5.86599 0.06999 0.35439 0.00427 1957 10 1956 10 1956 20 100.1 G8-108 262.15 401.75 0.65 0.07183 0.00159 1.62954 0.03290 0.16452 0.00235 981 20 982 13 982 13 100.0 G8-109 129.92 110.16 1.18 0.12859 0.00341 6.73217 0.16753 0.37968 0.00806 2079 20 2077 22 2075 38 100.2 G8-110 293.21 257.41 1.14 0.06760 0.00264 1.29115 0.04622 0.13852 0.00297 856 40 842 20 836 17 100.7 G8-111 352.06 503.76 0.70 0.06013 0.00242 0.56462 0.02073 0.06809 0.00138 608 45 455 13 425 8 107.1 G8-112 152.63 200.81 0.76 0.07291 0.00276 1.42655 0.04921 0.14191 0.00305 1011 37 900 21 855 17 105.3 G8-113 131.52 187.96 0.70 0.11894 0.00284 5.56174 0.12347 0.33913 0.00634 1940 18 1910 19 1882 31 103.1 G8-114 251.20 525.73 0.48 0.07324 0.00216 1.72497 0.04669 0.17081 0.00305 1021 28 1018 17 1017 17 100.4 G8-115 988.79 1639.06 0.60 0.06408 0.00141 0.48906 0.00972 0.05535 0.00073 744 21 404 7 347 4 116.4 G8-116 315.05 174.08 1.81 0.06495 0.00281 1.13564 0.04520 0.12680 0.00285 773 47 770 21 770 16 100.0 G8-117 520.28 438.25 1.19 0.17624 0.00202 9.98631 0.10609 0.41095 0.00496 2618 9 2434 10 2219 23 118.0 G8-118 1210.60 2135.02 0.57 0.11765 0.00123 2.19712 0.01983 0.13544 0.00138 1921 8 1180 6 819 8 144.1 G8-119 474.66 534.16 0.89 0.06678 0.00129 1.26680 0.02244 0.13758 0.00175 831 18 831 10 831 10 100.0 G8-120 779.36 1589.97 0.49 0.13208 0.00136 4.17041 0.03789 0.22901 0.00239 2126 8 1668 7 1329 13 160.0 G8-121 157.18 489.74 0.32 0.07660 0.00161 1.98728 0.03823 0.18817 0.00265 1111 18 1111 13 1111 14 100.0 G8-122 771.92 1989.11 0.39 0.05297 0.00177 0.29002 0.00885 0.03971 0.00065 328 40 259 7 251 4 103.2 G8-123 77.19 252.37 0.31 0.07598 0.00250 1.93387 0.05831 0.18460 0.00365 1095 31 1093 20 1092 20 100.3 G8-124 439.38 633.88 0.69 0.06909 0.00171 1.31639 0.02984 0.13819 0.00208 901 24 853 13 834 12 102.3 G8-125 167.12 321.28 0.52 0.10953 0.00199 4.84325 0.08171 0.32071 0.00470 1792 14 1792 14 1793 23 99.9 G8-126 272.03 581.53 0.47 0.06644 0.00161 1.24496 0.02768 0.13590 0.00199 820 24 821 13 821 11 100.0 G8-127 465.65 318.29 1.46 0.06472 0.00195 1.10924 0.03060 0.12430 0.00209 765 31 758 15 755 12 100.4 G8-128 138.78 250.56 0.55 0.05939 0.00335 0.57473 0.02967 0.07018 0.00189 581 66 461 19 437 11 105.5 G8-129 270.09 527.91 0.51 0.08105 0.00163 2.33546 0.04311 0.20901 0.00293 1223 17 1223 13 1224 16 99.9 G8-130 332.80 327.12 1.02 0.13192 0.00175 7.08375 0.08736 0.38949 0.00487 2124 10 2122 11 2120 23 100.2 G8-131 686.74 1452.42 0.47 0.06692 0.00154 0.95344 0.01994 0.10334 0.00144 835 22 680 10 634 8 107.3 G8-132 242.47 280.26 0.87 0.10326 0.00220 4.08355 0.08031 0.28685 0.00459 1684 17 1651 16 1626 23 103.6 G8-133 85.37 146.14 0.58 0.07198 0.00614 1.34405 0.10923 0.13542 0.00351 985 180 865 47 819 20 105.6 G8-134 523.85 735.45 0.71 0.05905 0.00214 0.56269 0.01866 0.06912 0.00128 569 41 453 12 431 8 105.1 G8-135 953.91 1199.78 0.80 0.12183 0.00118 4.29712 0.03722 0.25584 0.00258 1983 8 1693 7 1469 13 135.0 G8-136 113.00 219.26 0.52 0.06132 0.00246 0.91218 0.03369 0.10790 0.00221 650 45 658 18 661 13 99.5 G8-137 234.57 500.11 0.47 0.14896 0.00203 8.60252 0.11016 0.41889 0.00551 2334 10 2297 12 2255 25 103.5
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表 3 四石厂剖面样品碎屑锆石Lu-Hf测定结果
Table 3. Lu-Hf isotopic compositions of detrital zircons from Sishichang Profile
样品 年龄(Ma) 176Yb/177Hf 2σ 176Lu/177Hf 2σ 176Hf/177Hf 2σ 176Hf/177Hf(t) εHf(0) εHf(t) 2σ TDM(Ma) TDMC(Ma) fLu/Hf G8-1 1736 0.043433 0.000777 0.000955 0.000015 0.281448 0.000029 0.281416 -46.8 -9.3 1.0 2518 3023 -0.97 G8-2 431 0.086351 0.002160 0.001857 0.000049 0.282488 0.000035 0.282473 -10.0 -1.1 1.2 1105 1488 -0.94 G8-3 1977 0.037863 0.001038 0.000850 0.000023 0.281251 0.000026 0.281219 -53.8 -10.8 0.9 2778 3303 -0.97 G8-4 1203 0.058889 0.001203 0.001330 0.000030 0.281820 0.000023 0.281790 -33.7 -8.1 0.8 2027 2532 -0.96 G8-5 862 0.036347 0.000319 0.000771 0.000006 0.281839 0.000034 0.281826 -33.0 -14.4 1.2 1972 2664 -0.98 G8-6 2055 0.053166 0.000777 0.001152 0.000019 0.281495 0.000026 0.281450 -45.2 -0.8 0.9 2466 2734 -0.97 G8-8 816 0.083941 0.000608 0.001832 0.000017 0.281889 0.000038 0.281861 -31.2 -14.2 1.3 1958 2616 -0.94 G8-9 433 0.154276 0.001069 0.003652 0.000022 0.282535 0.000033 0.282505 -8.4 0.1 1.2 1091 1415 -0.89 G8-10 2450 0.029321 0.000121 0.000577 0.000003 0.280975 0.000030 0.280948 -63.6 -9.6 1.1 3129 3594 -0.98 G8-11 1995 0.070642 0.001973 0.001440 0.000044 0.281436 0.000037 0.281381 -47.2 -4.6 1.3 2566 2929 -0.96 G8-14 407 0.192146 0.003845 0.004228 0.000076 0.282975 0.000035 0.282943 7.2 15.0 1.2 429 439 -0.87 G8-15 813 0.063545 0.001186 0.001527 0.000038 0.281973 0.000027 0.281950 -28.3 -11.1 1.0 1824 2421 -0.95 G8-16 837 0.097396 0.002088 0.001727 0.000032 0.282497 0.000039 0.282470 -9.7 7.8 1.4 1088 1236 -0.95 G8-19 1186 0.105770 0.000836 0.002165 0.000021 0.282088 0.000028 0.282040 -24.2 0.4 1.0 1690 1982 -0.93 G8-23 1282 0.172407 0.002668 0.003792 0.000073 0.282256 0.000048 0.282165 -18.2 7.0 1.7 1516 1636 -0.89 G8-24 1834 0.026602 0.000580 0.000571 0.000016 0.281312 0.000020 0.281292 -51.6 -11.5 0.7 2676 3235 -0.98 G8-25 469 0.073703 0.001786 0.001934 0.000043 0.281910 0.000032 0.281893 -30.5 -20.8 1.1 1933 2752 -0.94 G8-26 1845 0.030683 0.000448 0.000660 0.000010 0.281354 0.000023 0.281331 -50.2 -9.9 0.8 2626 3142 -0.98 G8-27 617 0.094754 0.000919 0.002064 0.000017 0.282192 0.000034 0.282168 -20.5 -7.8 1.2 1538 2056 -0.94 G8-28 960 0.026403 0.000239 0.000597 0.000006 0.282117 0.000038 0.282106 -23.2 -2.3 1.3 1582 1980 -0.98 G8-30 1808 0.041449 0.000517 0.000919 0.000012 0.281549 0.000032 0.281517 -43.3 -4.1 1.1 2378 2749 -0.97 G8-31 460 0.078632 0.003314 0.001932 0.000073 0.282744 0.000038 0.282727 -1.0 8.5 1.3 739 897 -0.94 G8-32 475 0.102099 0.000252 0.002480 0.000012 0.282058 0.000050 0.282036 -25.3 -15.6 1.8 1749 2435 -0.93 G8-33 1546 0.246943 0.002195 0.005407 0.000048 0.281997 0.000047 0.281839 -27.4 1.4 1.7 1996 2199 -0.84 G8-35 1058 0.027364 0.000078 0.000625 0.000004 0.282027 0.000027 0.282015 -26.3 -3.4 1.0 1707 2122 -0.98 G8-36 862 0.047266 0.000276 0.001107 0.000006 0.281859 0.000031 0.281842 -32.3 -13.9 1.1 1961 2630 -0.97 G8-38 440 0.092821 0.002126 0.002272 0.000045 0.282572 0.000030 0.282554 -7.1 2.0 1.1 995 1302 -0.93 G8-39 467 0.076056 0.000455 0.001804 0.000015 0.282557 0.000045 0.282541 -7.6 2.1 1.6 1005 1314 -0.95 G8-40 873 0.056801 0.000975 0.001340 0.000020 0.282288 0.000030 0.282266 -17.1 1.4 1.1 1373 1675 -0.96 G8-41 793 0.160736 0.001068 0.003859 0.000032 0.282127 0.000045 0.282070 -22.8 -7.3 1.6 1713 2165 -0.88 G8-42 2157 0.041180 0.000687 0.000952 0.000018 0.281540 0.000047 0.281501 -43.6 3.3 1.7 2392 2547 -0.97 G8-43 1046 0.008928 0.000123 0.000112 0.000002 0.282137 0.000015 0.282135 -22.4 0.6 0.5 1534 1858 -1.00 G8-47 459 0.129884 0.000799 0.002956 0.000014 0.282314 0.000031 0.282289 -16.2 -7.0 1.1 1396 1883 -0.91 G8-48 491 0.046978 0.000526 0.001213 0.000020 0.281963 0.000032 0.281952 -28.6 -18.2 1.1 1823 2611 -0.96 G8-50 2023 0.078537 0.000944 0.001980 0.000020 0.281645 0.000027 0.281569 -39.8 2.7 1.0 2309 2485 -0.94 G8-51 868 0.061208 0.000591 0.001653 0.000019 0.282229 0.000022 0.282202 -19.2 -1.0 0.8 1467 1821 -0.95 G8-52 1828 0.039611 0.000228 0.000912 0.000005 0.281237 0.000041 0.281206 -54.3 -14.7 1.4 2801 3431 -0.97 G8-53 426 0.188594 0.001290 0.004204 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