Petrogenesis of the Late-Carboniferous Granites of Dalaimiao, Inner Mongolia and Its Implications for the Tectonic Transformation of Northern Margin of Xing'an-Mongolian Orogenic Belt
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摘要: 达来庙岩体出露于内蒙古苏左旗北部中蒙边境一带，是二连-东乌旗晚古生代岛弧岩浆岩带的重要组成部分，对其开展研究可有效丰富对兴蒙造山带北缘构造演化的认识.野外观察、锆石U-Pb年代学、岩石地球化学及同位素地球化学研究结果表明，岩体由中部的中细粒黑云二长花岗岩和边部的中粒黑云二长花岗岩组成，岩石侵位年龄为301.2±2.1 Ma（MSWD=1.2，2σ）.岩体总体上具有富硅、贫铁、弱过铝质的特征，但中细粒花岗岩相对富钠，中粒花岗岩钾含量则明显升高.两类花岗岩均富Rb、Th、U、Pb，亏损Ba、Sr、P以及Nb、Ta等高场强元素，不过中粒花岗岩重稀土更加富集，Eu负异常也更显著.岩体具有亏损的Sr-Nd-Hf同位素组成，（87Sr/86Sr）i=0.703 6~0.707 5，εNd（t）=0.08~2.77，εHf（t）=4.70~11.50.岩石学及地球化学分析显示，达来庙岩体为幔源物质底侵形成的新生地壳部分熔融的产物，岩石成因类型为I型，但具有向A型花岗岩过渡的特征，岩体产出于造山晚期挤压隆升向陆内拉张的过渡阶段，其侵位指示了晚石炭世兴蒙造山带北缘构造应力场从挤压向拉张转变的具体时限.Abstract: The Dalaimiao pluton crops out in the northern of Suzuoqi, near the border areas between China and Mongolia, which is referred as an important component of the Erenhot-East Ujimqin Late Paleozoic arc magmatic belt and its petrogenesis can provide insights into the tectonic evolution of the northern margins of Xing'an-Mongolian orogenic belt. Based on field investigation, geochronology and geochemistry, it is found that the pluton lithologically consists of medium-fine grained biotite granites in the center and medium-grained granites on the margin. Zircon U-Pb dating yields a weighted mean age of 301.2±2.1 Ma (MSWD=1.2, 2σ), indicating these granites were generated during a Late Carboniferous magmatic event. All of these granites are highly siliceous, Fe-poor, slightly peraluminous, and show enrichments in Rb, Th, U, Pb and depletions in Ba, Sr, P, Nb and Ta. The medium-fine grained biotite granites are Na-rich, and have high concentrations of heavy rare earth elements (REE), whereas the medium-grained granites show higher K2O contents, more significant elemental differentiation and negative europium anomalies. Dalaimiao pluton shows depleted isotopic compositions with (87Sr/86Sr)i=0.703 6-0.707 5, εNd(t)=0.08-2.77, and positive εHf(t) values of 4.70-11.50. Integrated geochronology and geochemical data suggest the Dalaimiao pluton is genetically classified as I-type granites, with some geochemical features of A-type granites. The Dalaimiao granites derived from partial melting of juvenile crust which were generated by the underplating of mantle material, and were formed in a tectonic transitional stage from compression uplift to intracontinental extension. Emplacement of Dalaimiao pluton provides more detailed constraints on the specific timing of tectonic variation in the northern margins of Xing'an-Mongolian orogenic belt during the Late Carboniferous.
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Key words:
- granites /
- Late Paleozoic /
- Xing-Meng orogenic belt /
- petrogenesis /
- transformation of tectonic setting /
- geochemistry
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图 1 达来庙岩体构造位置(a)及地质简图(b)
图a据Xiao et al.(2003)；图b据内蒙古自治区地质调查院, 2008, 1:25万巴音乌拉幅、吉尔嘎郎图幅、阿巴嘎旗幅区域地质调查报告；1.中粒黑云二长花岗岩；2.中细粒黑云二长花岗岩；3.流纹斑岩；4.巴彦呼舒组；5.宝力高庙组；6.白音高老组
Fig. 1. Diagrams showing tectonic location (a) and geological sketch (b) of the Dalaimiao pluton
图 2 达来庙岩体野外特征及岩性岩相学显微照片
a、c.中细粒黑云二长花岗岩；b、d.中粒黑云二长花岗岩
Fig. 2. Field outcrop and microphotographs of the Dalaimiao pluton
图 3 达来庙岩体被测锆石CL图像、LA-ICP-MS分析点位及U-Pb谐和图
Fig. 3. CL images, localities of the points for LA-ICP-MS measurements and the U-Pb concordia diagrams of zircons from the Dalaimiao pluton
图 4 达来庙岩体主量元素关系
a.SiO2-K2O关系，底图据Le Maitre et al.(1989)；b.A/CNK-A/NK关系，底图据Maniar and Piccoli(1989)；浅色符号为二连-东乌旗晚古生代岩浆岩带收集资料，数据来源：云飞等(2011)、Zhang et al.(2011, 2015)、许立权等(2012)、程银行等(2012, 2014)、何付兵等(2013)、李可等(2014)、Tong et al.(2015)、刘锐等(2016)、王树庆等(2017)、以及作者未发表数据
Fig. 4. Major element variation diagrams for the Dalaimiao pluton
图 5 达来庙岩体微量元素原始地幔标准化蛛网图(a)及稀土元素球粒陨石标准化配分曲线(b)
原始地幔标准化值据McDonough and Sun(1995)，球粒陨石标准化值据Boynton(1984)
Fig. 5. Primitive mantle-normalized trace element spidergrams (a) and chondrite-normalized REE distribution patterns (b) for the Dalaimiao pluton
图 6 达来庙岩体(87Sr/86Sr)i-εNd(t)关系(a)和T-εHf(t)关系(b)
二连-东乌旗岩浆岩带数据及图例同图 4，贺根山蛇绿岩数据引自Miao et al.(2008)；内蒙北部弧岩浆岩及二连-东乌旗早二叠世碱性花岗岩数据引自Zhang et al.(2015)；兴蒙造山带东段及燕山褶冲带数据引自Yang et al.(2006)、Xiao et al.(2004)、Chen et al.(2009)；DM.亏损地幔；LC.下地壳；UC.上地壳；EMI.I型富集地幔；EMII.II型富集地幔；数据来源Wu et al.(2000)
Fig. 6. (87Sr/86Sr)i-εNd(t) diagram (a) and T-εHf(t) plot (b) of the Dalaimiao pluton
图 7 达来庙岩体岩石类型判别图
图据Whalen et al.(1987)；OGT.未分异的I、S、M型花岗岩区；FG.分异的I型花岗岩区；A.A型花岗岩区，图例同图 4
Fig. 7. Granite type discrimination diagrams of the Dalaimiao pluton
图 8 达来庙岩体构造判别图解
图据Pearce et al.(1984)；图例同图 4；syn-/post-COLG.同/后碰撞花岗岩；WPG.板内花岗岩；VAG.火山弧花岗岩；ORG.洋脊花岗岩
Fig. 8. Tectonic discrimination diagrams of the Dalaimiao pluton
表 1 达来庙岩体LA-ICP-MS锆石U-Pb定年结果
Table 1. LA-ICP-MS zircon U-Pb dating results of the Dalaimiao pluton
点号 Pb(10-6) U(10-6) Th/U 同位素比值 年龄(Ma) 207Pb/235U 1σ 206Pb/238U 1σ 207Pb/206Pb 1σ 206Pb/238U 1σ 207Pb/235U 1σ 样品：14NM14；采样位置：E112°42′22″，N44°30′10″ 14NM14-01 98 1 746 0.75 0.495 78 0.006 58 0.047 76 0.000 49 0.075 28 0.000 92 301 3 409 5 14NM14-02 24 450 0.48 0.486 71 0.014 44 0.047 84 0.000 49 0.073 79 0.001 98 301 3 403 12 14NM14-03 36 733 0.51 0.348 05 0.005 94 0.047 60 0.000 47 0.053 03 0.000 84 300 3 303 5 14NM14-04 83 1 592 0.85 0.532 02 0.009 37 0.044 38 0.000 44 0.086 94 0.001 48 280 3 433 8 14NM14-05 55 1 116 0.49 0.352 15 0.005 47 0.047 81 0.000 47 0.053 42 0.000 75 301 3 306 5 14NM14-06 42 887 0.38 0.345 21 0.005 95 0.047 74 0.000 47 0.052 44 0.000 85 301 3 301 5 14NM14-07 42 883 0.42 0.345 52 0.006 60 0.047 46 0.000 47 0.052 81 0.000 93 299 3 301 6 14NM14-08 34 721 0.32 0.344 15 0.006 50 0.047 59 0.000 47 0.052 45 0.000 93 300 3 300 6 14NM14-09 24 551 0.06 0.349 76 0.007 65 0.047 74 0.000 48 0.053 14 0.001 10 301 3 305 7 14NM14-10 44 883 0.50 0.353 02 0.006 02 0.047 99 0.000 48 0.053 35 0.000 84 302 3 307 5 14NM14-11 54 1 045 0.64 0.344 96 0.005 34 0.048 01 0.000 47 0.052 11 0.000 74 302 3 301 5 14NM14-12 50 918 0.86 0.650 98 0.013 71 0.044 00 0.000 45 0.107 29 0.002 22 278 3 509 11 14NM14-13 14 278 0.42 0.348 32 0.011 82 0.048 36 0.000 49 0.052 24 0.001 75 304 3 303 10 14NM14-14 17 346 0.39 0.347 17 0.009 73 0.048 27 0.000 49 0.052 17 0.001 38 304 3 303 8 14NM14-15 61 1 259 0.47 0.341 36 0.006 98 0.046 04 0.000 46 0.053 78 0.001 12 295 3 298 6 14NM14-16 28 574 0.32 0.350 94 0.007 91 0.048 87 0.000 49 0.052 09 0.001 12 308 3 305 7 
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表 2 达来庙岩体主量(%)、微量和稀土元素(10-6)组成及相关地球化学参数
Table 2. Major (%), trace and rare earth (10-6) element contents and related geochemical parameters of the Dalaimiao pluton
岩性 中细粒二长花岗岩 中粒二长花岗岩 样品号 14SZ14 14SZ15 14SZ16 14SZ17 14SZ18 SiO2 71.00 71.08 72.97 71.70 71.55 TiO2 0.37 0.36 0.29 0.35 0.33 Al2O3 14.46 14.52 14.44 14.18 14.36 Fe2O3T 2.65 2.41 1.73 2.36 2.53 MnO 0.05 0.05 0.04 0.04 0.05 MgO 0.90 0.88 0.54 0.54 0.57 CaO 1.79 1.88 0.81 1.30 1.38 Na2O 3.99 4.14 4.36 3.30 3.72 K2O 3.62 3.48 3.66 5.50 4.67 P2O5 0.17 0.12 0.20 0.15 0.10 LOI 1.01 1.08 0.95 0.59 0.74 ALK 7.61 7.62 8.02 8.8 8.39 K2O/Na2O 0.91 0.84 0.84 1.67 1.26 AR 2.76 2.74 3.22 2.49 2.79 A/CNK 1.05 1.04 1.14 1.03 1.05 A/NK 1.38 1.37 1.30 1.24 1.28 Sc 7.37 7.98 4.95 7.65 6.87 V 35 33.4 20.1 27.8 25.9 Cr 10.8 9.64 5.77 7.37 4.66 Co 4.77 4.34 2.38 2.57 2.78 Ni 5.42 4.71 3.44 4.24 3.28 Cu 6.72 7.84 4.2 5.75 7.13 Ga 14.4 14.5 14.1 18.2 18.9 Zn 42.5 37.8 23 31.2 35.2 Cs 0.98 1.48 2.87 3.26 5.43 Rb 91 110 145 188 200 Sr 255 237 129 159 130 Ba 674 493 423 443 260 Th 8.19 6.59 14.5 18.2 15 U 1.66 1.18 3.11 2.78 2.31 Nb 6.58 6.34 9.61 19 16.8 Ta 0.56 0.55 1.13 2.26 1.53 Pb 12.1 11.7 14 21 16.1 Zr 148 130 134 210 220 Hf 4.43 3.9 4.35 7.22 7.61 Y 16.8 16.8 19.5 68 43 Zr+Nb+Ce+Y 215.98 175.54 210.91 374.40 331.10 104 Ga/Al 1.88 1.89 1.84 2.42 2.49 La 18.3 8.78 18.2 29.2 10.8 Ce 44.6 22.4 47.8 77.4 51.3 Pr 5.88 3.36 5.76 11.4 5.65 Nd 23 14.2 21.6 45.8 24.7 Sm 4.6 3.44 4.23 10.9 6.81 Eu 0.97 0.75 0.63 0.87 0.66 Gd 4.11 3.31 4.15 11 7.04 Tb 0.63 0.54 0.65 2.00 1.32 Dy 3.29 3.11 3.6 12.4 7.7 Ho 0.61 0.6 0.74 2.46 1.65 Er 1.71 1.73 2.1 7.28 4.65 Tm 0.26 0.26 0.32 1.13 0.7 Yb 1.72 1.63 2.14 7.19 4.63 Lu 0.26 0.24 0.33 1.05 0.71 ∑REE 109.94 64.35 112.25 220.08 128.32 LR/HR 7.73 4.63 7.00 3.94 3.52 (La/Yb)N 7.17 3.63 5.73 2.74 1.57 (La/Sm)N 2.50 1.61 2.71 1.69 1.00 (Gd/Yb)N 1.93 1.64 1.56 1.23 1.23 δEu 0.67 0.67 0.45 0.24 0.29
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表 3 达来庙岩体Sr-Nd同位素组成
Table 3. Sr-Nd isotopic compositions of the Dalaimiao pluton
样品 年龄(Ma) 87Rb/86Sr 87Sr/86Sr (87Sr/86Sr)i 147Sm/144Nd 143Nd/144Nd (143Nd/144Nd)i εNd T2DM(Ga) 14SZ14 301 1.032 6 0.708 030 0.703 60 0.126 5 0.512 641 0.512 391 2.77 0.84 14SZ15 301 1.343 2 0.710 180 0.704 43 0.153 2 0.512 612 0.512 310 1.17 0.97 14SZ17 301 3.425 9 0.722 180 0.707 51 0.150 5 0.512 681 0.512 384 2.62 0.85 14SZ18 301 4.459 0 0.725 448 0.706 35 0.174 4 0.512 598 0.512 254 0.08 1.05
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表 4 达来庙岩体锆石Hf同位素分析结果
Table 4. Zircon Hf isotopic compositions of the Dalaimiao pluton
点号 年龄(Ma) 176Yb/177Hf 176Lu/177Hf 176Hf/177Hf 2σ (176Hf/177Hf)i εHf(t) 2σ TDM(Ga) T2DM(Ga) fLu/Hf 14SZ14.3 300 0.054 8 0.001 414 0.282 860 0.000 016 0.282 852 9.0 0.6 0.56 0.89 -0.96 14SZ14.5 301 0.122 7 0.003 037 0.282 833 0.000 021 0.282 816 7.8 0.7 0.63 1.00 -0.91 14SZ14.6 301 0.069 4 0.001 800 0.282 810 0.000 017 0.282 800 7.2 0.6 0.64 1.05 -0.95 14SZ14.7 299 0.063 9 0.001 606 0.282 932 0.000 017 0.282 923 11.5 0.6 0.46 0.66 -0.95 14SZ14.8 300 0.084 7 0.002 183 0.282 788 0.000 019 0.282 776 6.3 0.7 0.68 1.13 -0.93 14SZ14.9 301 0.067 2 0.001 733 0.282 818 0.000 022 0.282 808 7.5 0.8 0.63 1.03 -0.95 14SZ14.10 302 0.090 3 0.002 224 0.282 861 0.000 018 0.282 848 9.0 0.6 0.57 0.90 -0.93 14SZ14.11 302 0.051 0 0.001 422 0.282 863 0.000 029 0.282 855 9.2 1.0 0.56 0.87 -0.96 14SZ14.13 304 0.048 5 0.001 289 0.282 735 0.000 024 0.282 728 4.7 0.8 0.74 1.28 -0.96 14SZ14.14 304 0.057 7 0.001 497 0.282 749 0.000 024 0.282 740 5.2 0.8 0.72 1.24 -0.95 14SZ14.15 295 0.086 9 0.002 067 0.282 840 0.000 019 0.282 829 8.1 0.7 0.60 0.97 -0.94 14SZ14.16 308 0.065 1 0.001 520 0.282 785 0.000 024 0.282 776 6.5 0.8 0.67 1.12 -0.95
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