新疆阿尔泰山南缘玛音鄂博断裂南侧变质基性岩的发现及其地质意义

周刚; 张招崇; 杨文平; 谷高中; 张小林; 罗世宾; 王祥

新疆阿尔泰山南缘玛音鄂博断裂南侧变质基性岩的发现及其地质意义

周刚^{1, 2,},
张招崇³,
杨文平²,
谷高中²,
张小林²,
罗世宾²,
王祥²

1.
中国地质科学院研究生部, 北京 100037
2.
新疆地矿局第四地质大队, 新疆阿勒泰 836500
3.
中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083

基金项目:

新疆维吾尔自治区1∶5万区调项目 XJQDW2003-03

国家“305”项目 2001BA609A-07-02

详细信息

作者简介:
周刚(1966-), 男, 高级工程师, 在职博士研究生, 主要研究方向为岩浆作用与成矿.E-mail: xazhougang@126.com

中图分类号: P588.3
计量
- 文章访问数: 3824
- HTML全文浏览量: 85
- PDF下载量: 3
- 被引次数: 0
出版历程
- 收稿日期: 2005-07-02
- 刊出日期: 2005-11-25

Metabasic Rock on the South Side of Mayin'ebo Fault in the South Margin of Altay Mountains, Xinjiang, and Its Geological Implications

1.
Graduate School, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
No.4 Geological Team of Xinjiang Bureau of Geology and Mineral Resources, Altay 836500, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 位于额尔齐斯-玛音鄂博大断裂带南侧的阿热勒托别变质基性岩产于下石炭统姜巴斯套组一套细碎屑沉积岩中.岩石组成以变质玄武岩为主, 它们具有相对高的TiO₂、MgO和低SiO₂、K₂O的特点; 在稀土元素组成上, 显示轻稀土弱富集的配分模式, 无明显Eu异常; 微量元素组成显示大离子亲石元素富集, 并具有明显的正Th异常和弱的Nb负异常、高的Nb含量(> 2×10^-6) 以及HFSE基本上和MORB相当的特点; 其Zr/Nb比值落在MORB范围之内, 而Ti/V比值略比MORB高, 表明其为MORB源的亏损地幔在相对较低熔融程度下熔融的产物.其ε_Nd(t) 值为+7.40~+8.35, 略低于MORB, 但高于洋岛以及大陆板内玄武岩.因此该变质基性岩总体上兼有火山弧和洋中脊玄武岩特征, 因而其可能形成于弧后环境, 代表了弧后盆地扩张早期的产物.
- 变质基性岩 /
- 地球化学 /
- 弧后盆地 /
- 额尔齐斯-玛音鄂博缝合带
Abstract: The Areletuobie metabasic rocks occur in the Lower Carboniferous Jiangbasitao Formation, which consists of sedimentary fine clastic sequences on the south side of the Ertix-Mayin'ebo deep-large fault that marks the boundary between the Altay and Junggar orogenic belts. The metabasic rocks display relatively high TiO₂ (1.15%-2.20%) and MgO contents (7.03%-9.54%), and relatively low SiO₂ (45.72%-48.31%) and K₂O contents (0.13%-0.41%). They exhibit slight LREE enrichment on the chondrite-normalized REE patterns without Eu anomalies. Their MORB-normalized trace element patterns are characterized by large ion lithophile element (LILE) enrichment with significantly positive Th anomalies, slightly negative Nb anomalies and high Nb concentrations (2.6×10^-6-8.7×10^-6), whereas their high field strength element (HFSE) contents resemble those of MORB. The Zr/Nb ratios range from 18.9 to 32.7, similar to those of MORB. In contrast, their Ti/V ratios are higher than those of MORB. All of these features suggest that they were generated by relatively low degrees of melting of MORB-like depleted mantle source. Their ε_Nd(t) values range from 7.40 to 8.35, lower than those of MORB, but higher than those rocks derived from oceanic island and intracontinental basalts. Consequently, the metabasic rocks have the somewhat transitional features of the volcanic rocks between a volcanic arc and an oceanic island. It is therefore inferred that they were formed from a back-arc basin, and represent the products in the early stage of back-arc basin spreading.
- metabasic rock /
- geochemistry /
- back-arc basin /
- Ertix-Mayin'ebo suture zone

HTML全文

图 1 阿热勒托别变质基性岩的位置及地质剖面

Fig. 1. Simplified geological map and section of the Areletuobie metabasic rocks

下载: 全尺寸图片幻灯片

图 2 阿热勒托别变质基性岩岩石的(Zr/TiO₂) ×10^-4-Nb/Y定名图(Winchester and Floyd, 1977)

+.阿热勒托别变质基性岩; ◆.卡拉麦里蛇绿岩带中玄武岩; △.阿尔曼太蛇绿岩带中玄武岩; □.库尔提蛇绿岩中玄武岩

Fig. 2. (Zr/TiO₂) ×10^-4 vs. Nb/Y diagram of the Areletuobie metabasic rocks

下载: 全尺寸图片幻灯片

图 3 阿热勒托别变质基性岩岩石的(FeO^*/MgO) -SiO₂图解(底图据Miyashiro, 1974)

Fig. 3. (FeO^*/MgO) -SiO₂ diagram of the Areletuobie metabasic rocks

下载: 全尺寸图片幻灯片

图 4 阿热勒托别变质基性岩稀土元素配分曲线(标准化数据据Sun and McDonough, 1989)

Fig. 4. Chondrite-normalized REE patterns of the Areletuobie metabasic rocks

下载: 全尺寸图片幻灯片

图 5 阿热勒托别变质基性岩微量元素MORB标准化曲线(标准化数据据Sun and McDonough, 1989)

Fig. 5. MORB-normalized trace element patterns of the Areletuobie metabasic rocks

下载: 全尺寸图片幻灯片

表 1 阿热勒托别变质基性岩的主元素(%)和微量元素(10^-6) 成分

Table 1. Major and trace element data of the Areletuobie metabasic rocks

表 2 阿热勒托别变质基性岩Sm-Nd同位素及模式年龄

Table 2. Sm-Nd isotopic compositions of the Areletuobie metabasic rocks and their modal ages

参考文献(64)

[1]	Cai, W. J., 1986. Preliminary study on plate tectonics of northern East Junggar in Xinjiang. Contributions to the project of plate tectonics in northern China. Geological Publishing House, Beijing, 1 - 26 (in Chinese).
[2]	Cao, R. L. 1994. Ophiolite and mafic-ultramafic complex rocks of northern Xinjiang. Xinjiang Geol., 12 (1): 25 - 31 (in Chinese with English abstract).
[3]	Cao, R.L., Zhu, S. H., Zhu, X. K., et al., 1993. Plate and terrain tectonics of northern Xinjiang. In: Tu, G. Z., ed., New improvement of solid geosciences in northern Xinjiang. Science Press, Beijing, 11 - 26 (in Chinese).
[4]	Chen, Z. F., Cheng, S. D., Liang, Y. H., 1997. Openingclosing tectonics of Xinjiang and mineralization. Xinjiang Technol. and Sanitation Press, Urumchi (in Chinese).
[5]	Davidson, J.P., 1996. Deciphering mantle and crustal signatures in subduction zone magmatism. Subduction top to bottom. Geophysical Monograph 96. American Geophysical Union, Washington, DC, 251 - 262.
[6]	Elliott, T., Plank, T., Zindler, A., et al., 1997. Element transport from slab to volcanic front at the Mariana arc. J. Geophys. Res., 102(14): 991;102(15): 19.
[7]	Ewart, A., Collerson, K.D., Regelous, M., et al., 1998. Geochemical evolution within the Tonga-Kermadec-Lau arcback-arc systems; the role of varying mantle wedge composition in space and time. J. Petrol., 39 (3): 331 - 368. doi: 10.1093/petroj/39.3.331
[8]	Fretzdorff, S., Livermore, R.A., Devey, C. W., et al., 2002. Petrogenesis of the back-arc east Scotia ridge, south Atlantic Ocean. J. Petrol., 43 (8): 1435 - 1467. doi: 10.1093/petrology/43.8.1435
[9]	Gamble, J.A., Wright, I.C., Woodhead, J.D., et al., 1995. Arc and back-arc geochemistry in the southern Kermadec arc-Ngatoro basin and offshore Taupo volcanic zone, S W Pacific. In: Smellie, J.L., ed., Volcanism assciated with extension at consuming plate margins. Geol. Soc., Special Publication, 193 - 212.
[10]	Gribble, R. F., Stern, R.J., Bloomer, S. H., et al., 1996. MORB mantle and subduction components interact to generate basalts in the southern Mariana trough backarc basin. Geochimica et Cosmochimica, 60: 2153 - 2166. doi: 10.1016/0016-7037(96)00078-6
[11]	Gribble, R.F., Stern, R.J., Newman, S. et al., 1998. Chemical and isotopic composition of lavas from the northern Mariana trough: Implications for magma genesis in back-arc basins. J. Petrol., 39 (1): 125 - 154. doi: 10.1093/petroj/39.1.125
[12]	Hawkesworth, C.J., Gallagher, K., Hergt, J. M., et al., 1993. Mantle and slab contributions in arc magmas. Annu. Rev. Earth Planet. Sci., 21: 175 - 204. doi: 10.1146/annurev.ea.21.050193.001135
[13]	He, G.Q., Li, M.S., Liu, D.Q., et al., 1994. Paleozoic crustal evolution and mineralization in Xinjiang of China. Xinjiang Peopleʾs Publishing House, Urumchi (in Chinese).
[14]	Hollings, P., Kerrich, R., 2004. Geochemical systematics of tholeiites from the 2.86 Ga Pickle Crow assemblage, northwestern Ontario: Arc basalts with positive and negative Nb-Hf anomalies. Precambrian Research, 134: 1 - 20. doi: 10.1016/j.precamres.2004.05.009
[15]	Huang, J.H., Jin, Z.D., Li, F.C., 1999. Sm-Nd isotopes and age of the Hongguleleng ophiolite. Chinese Sci. Bull., 44(9): 1004 - 1006 (in Chinese). doi: 10.1360/csb1999-44-9-1004
[16]	Huang, Y., Hawkesworth, C., Smith, I., et al., 2000. Geochemistry of Late Cenozoic basaltic volcanismin Northland and Coromandel, New Zealand: Implications for mantle enrichment processes. Chem. Geol., 164: 219 - 238. doi: 10.1016/S0009-2541(99)00145-X
[17]	Jin, C. W., Huang, X., Xu, Y.S., et al. 2001. HonggulelengAermantai ophiolite and its relationship with mineralization. The basic studies of metallic mineral resources in Xinjiang. Science Press, Beijing, 27 - 51 (in Chinese).
[18]	Li, J.Y., 1995. Main characteristics and emplacement processes of the East Junggar ophiolite. Acta Petrologica Sinica, 11 (Suppl. ): 73 - 84 (in Chinese with English abstract).
[19]	Liu, D.Q., Tang, Y.L., Zhou, R. H., 1993. Devonian intraoceanic arc and bonite in North Junggar, Xinjiang. Xinjiang Geol., 11 (1): 1 - 12 (in Chinese with English abstract).
[20]	Liu, W., Zhang, X.B., 1993. The characteristics and geological significance of Ulungar-Zhaisangpo tectonic mélange belt. In: Tu, G.Z., ed., New improvement of solid geosciences in northern Xinjiang. Science Press, Beijing, 217 - 228 (in Chinese).
[21]	Macdonald, R., Hawkesworth, C.J., Heath, E., 2000. The Lesser Antilles volcanic chain: A study in arc magmatism. Earth Sci. Rev., 49 (1 - 4): 1 - 76. doi: 10.1016/S0012-8252(99)00069-0
[22]	Mei, H.J., Yang, X.C., Wang, J.D., et al., 1993. The trace element geochemistry of Late Paleozoic volcanic rocks on the southern side of Ertix River and the evolutional history of tectonic setting. In: Tu, G.Z., ed., New improvement of solid geosciences in northern Xinjiang. Science Press, Beijing, 199 - 216 (in Chinese with English abstract).
[23]	Miyashiro, A., 1974. Volcanic rock series in island arcs and active continental margins. A m. J. Sci., 274: 317 - 327.
[24]	Pearce, J. A., Ernewein, M., Bloomer, S. H., et al., 1995. Geochemistry of Lau basin volcanic rocks. In: Smellie, J., ed., Volcanism associated with extension at consuming plate margins. Geol. Soc. London Special Publication, 53 - 75.
[25]	Pearce, J. A., Kempton, P. D., Nowell, G. M. et al., 1999. Hf-Nd element and isotope perspective on the nature and provenance of mantle and subduction components in western Pacific arc-basin systems. J. Petrol., 40 (11): 1579 - 1611. doi: 10.1093/petroj/40.11.1579
[26]	Pearce, J. A., Parkinson, I.J., 1993. Trace-element models for mantle melting: Application to volcanic arc petrogenesis. Geol. Soc. London Special Publication, 76: 373 - 403. doi: 10.1144/GSL.SP.1993.076.01.19
[27]	Pearce, J. A., Peate, D. W., 1995. Tectonic implications of the composition of volcanic arc magmas. Annu. Rev. Earth Planet. Sci., 23: 251 - 285. doi: 10.1146/annurev.ea.23.050195.001343
[28]	Sun, S.S., McDonough, W.F., 1989. Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes. In: Saunders, A.D., Norry, M.J., eds., Magmatismin the ocean basins. Geological Society London Special Publication, 42: 313 - 345.
[29]	Taylor, R.N., Lapierre, H., Vidal, P., et al., 1992. Igneous geochemistry and petrogenesis of the Izu-Bonin forearc basin. In: Maddox, E.M., ed., Proceedings of the ocean drilling program, Bonin arc-trench system, scientific results, 126: 405 - 430.
[30]	Wang, Z.H., Sun, S., Li, J.L., et al., 2003. Paleozoic tectonic evolution of the northern Xinjiang, China: Geochemical and geochronological constraints from the ophiolites. Tectonics, 22(2): 1014.
[31]	Wang, Z.X., Zhou, G.Z., Li, T., 2003. The consideration on ophiolite and interrelated issue in northern Xinjiang. Acta Petrologica Sinica, 19 (4): 683 - 691 (in Chinese with English abstract).
[32]	Wilson, M. 2001. Igneous petrogenesis. Chapman and Hall, London, 133.
[33]	Winchester, J.A., Floyd, P. A., 1977. Geological discrimination of different magma series and their differentiation products using immobile elements. Chemical Geology, 20: 325 - 343. doi: 10.1016/0009-2541(77)90057-2
[34]	Woodhead, J.D., Eggins, S.M., Gamble, J., 1993. High field strength and transition element systematics inisland arc and back-arc basin basalts: Evidence for multi-phase melt extraction and a depleted mantle wedge. Earth Planet. Sci. Lett., 114: 491 - 504. doi: 10.1016/0012-821X(93)90078-N
[35]	Xiao, X.C., Tang, Y. Q., Feng, Y. M., et al., 1992. Tectonics evolution of the northern Xinjiang and its adjacent region. Geological Publishing House, Beijing (in Chinese).
[36]	Xu, J.F., Chen, F.R., Yu, X.Y., et al., 2001a. Kuerti ophiolitein Altay area of northern Xinjiang: Magmatism of an ancient back-arc basin. Acta Petrologica et Mineralogica, 20 (3): 344 - 352 (in Chinese with English abstract).
[37]	Xu, J.F., Mei, H.J., Yu, X.Y., et al., 2001b. Late Paleozoic subduction-related adakites in the northern margin of Junggar: Partial melting products of subducting slab. Chinese Sci. Bull., 46(8): 684 - 688 (in Chinese). doi: 10.1360/csb2001-46-8-684
[38]	Yang, W.P., Zhou, G., Zhang, Z.C., et al., 2005. Discovery and the significance of the Xileketehalasu porphyry copper deposit in the south margin of the Altay copper deposit belt. Geology of China, 32: 107 - 114 (in Chinese with English abstract).
[39]	Zhang, C., Zhai, M. G., 1993. Ophiolitic belts and their genetic environment in western Junggar. In: Tu, G. Z., ed., New improvement of solid geosciences in northern Xinjiang. Science Press, Beijing, 53 - 78 (in Chinese).
[40]	Zhang, H.X., Niu, H.C., Hiroaki, S., et al., 2004. Late Paleozoic adakite and Nb-enriched basalt from northern Xinjiang: Evidence for the southward subduction of the paleoAsian Ocean. Geological Journal of China Universities, 10(1): 106 -113 (in Chinese with English abstract).
[41]	Zhang, Q., Zhou, G. Q., 2001. Ophiolites of China. Science Press. Beijing.
[42]	Zhang, X.B., Yang, X.Y., 1993. The evolutional and genetic mechanism of tectonics of Altay area. In: Tu, G. Z., ed., New improvement of solid geosciences in northern Xinjiang. Science Press, Beijing, 173 - 184 (in Chinese).
[43]	Zhang, Z.C., Yan, S. H., Chen, B. L., et al., 2005. Middle Dovenian picrites of the south margin of Altay orogenic belt and implications for the tectonic setting and petrogenesis. Earth Science—Journal of China University of Geosciences, 30(3): 289 - 297 (in Chinese with English abstract).
[44]	蔡文俊, 1986. 新疆准噶尔东北缘板块构造初步研究. 见: 中国北方板块构造论文集. 北京: 地质出版社, 1 - 26.
[45]	曹荣龙, 1994. 新疆北部蛇绿岩及基性-超基性杂岩. 新疆地质, 12(1): 25 - 31. https://www.cnki.com.cn/Article/CJFDTOTAL-XJDI401.003.htm
[46]	曹荣龙, 朱寿华, 朱祥坤, 等, 1993. 新疆北部板块与地体构造格局. 见: 涂光炽主编, 新疆北部固体地球科学新进展. 北京: 科学出版社, 11 - 26.
[47]	陈哲夫, 成守德, 梁云海, 1997. 新疆开合构造与成矿. 乌鲁木齐: 新疆科技卫生出版社.
[48]	何国琦, 李茂松, 刘德权, 等, 1994. 中国新疆古生代地壳演化及成矿. 乌鲁木齐: 新疆人民出版社.
[49]	黄建华, 金章东, 李福春, 1999. 洪古勒楞蛇绿岩Sm-Nd同位素特征及时代界定. 科学通报, 44(9): 1004 - 1006. doi: 10.3321/j.issn:0023-074X.1999.09.026
[50]	金成伟, 黄萱, 徐永生, 等, 2001. 洪古勒楞-阿尔曼太蛇绿岩及其与成矿关系. 见: 新疆金属矿产资源的基础研究. 北京: 科学出版社, 27 - 51.
[51]	李锦轶, 1995. 新疆东准噶尔蛇绿岩的基本特征和侵位历史. 岩石学报, 11 (增刊): 73 - 84. https://www.cnki.com.cn/Article/CJFDTOTAL-YSXB5S1.005.htm
[52]	刘德权, 唐延龄, 周汝洪, 1993. 新疆北准噶尔泥盆纪洋内弧及博宁岩. 新疆地质, 11 (1): 1 - 12. https://www.cnki.com.cn/Article/CJFDTOTAL-XJDI199301000.htm
[53]	刘伟, 张湘炳, 1993. 乌伦古-斋桑泊构造杂岩带特征及其地质意义. 见: 涂光炽主编, 新疆北部固体地球科学新进展. 北京: 科学出版社, 217 - 228.
[54]	梅厚均, 杨学昌, 王俊达, 等, 1993. 额尔齐斯河南侧晚古生代火山岩的微量元素地球化学与构造环境的变迁史. 见: 涂光炽主编, 新疆北部固体地球科学新进展. 北京: 科学出版社, 199 - 216.
[55]	王宗秀, 周高志, 李涛, 2003. 对新疆北部蛇绿岩及相关问题的思考. 岩石学报, 19 (4): 683 - 691. https://www.cnki.com.cn/Article/CJFDTOTAL-YSXB200304008.htm
[56]	肖序常, 汤耀庆, 冯益民, 等, 1992. 新疆北部及其邻区大地构造. 北京: 地质出版社.
[57]	许继峰, 陈繁荣, 于学元, 等, 2001a. 新疆北部阿尔泰地区库尔提蛇绿岩: 古弧后盆地系统的产物. 岩石矿物学杂志, 20(3): 344 - 352. https://www.cnki.com.cn/Article/CJFDTOTAL-YSKW200103017.htm
[58]	许继峰, 梅厚均, 于学元, 等, 2001b. 准噶尔北缘晚古生代岛弧中与俯冲作用有关的adakite火山岩: 消减板片部分熔融的产物. 科学通报, 46(8): 684 - 687. https://www.cnki.com.cn/Article/CJFDTOTAL-KXTB200108015.htm
[59]	杨文平, 周刚, 张招崇, 等, 2005. 阿尔泰铜矿带南缘希勒克特哈腊苏斑岩铜矿的发现及其意义. 中国地质, 32: 107 - 114. doi: 10.3969/j.issn.1000-3657.2005.01.014
[60]	张弛, 翟明国, 1993. 西准噶尔蛇绿岩带及形成环境. 见: 涂光炽主编, 新疆北部固体地球科学新进展. 北京: 科学出版社, 53 - 78.
[61]	张海祥, 牛贺才, Hiroaki Sato, 等, 2004. 新疆北部晚古生代埃达克岩、富铌玄武岩组合: 古亚洲洋板块南向俯冲的证据. 高校地质学报, 10(1): 106 - 113. doi: 10.3969/j.issn.1006-7493.2004.01.010
[62]	张旗, 周国庆, 2001. 中国蛇绿岩. 北京: 科学出版社.
[63]	张湘炳, 杨新岳, 1993. 阿尔泰地区大地构造演化体制及其形成机理. 见: 涂光炽主编, 新疆北部固体地球科学新进展. 北京: 科学出版社, 173 - 184.
[64]	张招崇, 闫升好, 陈柏林, 等, 2005. 阿尔泰造山带南缘中泥盆世苦橄岩及其大地构造和岩石学意义. 地球科学———中国地质大学学报, 30(3): 289 - 297. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200503004.htm