中天山南缘艾尔宾山志留纪侵入岩地球化学特征及地质意义
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摘要
中天山南缘艾尔宾山地区岩浆活动的产物可能记录着南天山洋盆与伊犁中天山板块的活动,对解决南天山洋盆的俯冲问题具有重要意义。本文对中天山南缘艾尔宾山志留纪花岗岩进行了系统的岩石学、地球化学及同位素年代学研究。对4件样品的LA-ICP-MS锆石U-Pb定年结果表明,该岩体的形成时代为志留纪;研究区岩石具有准铝质高钾钙碱性系列岩石特征,为I型花岗岩,岩浆来源可能为下地壳的部分熔融;在稀土元素球粒陨石标准化分布图上,表现为强烈的右倾近平行的曲线簇。大离子亲石元素Rb、Ba、K等明显富集;高场强元素Nb、Ta、Ti、P等强烈亏损,表现出岛弧岩浆岩的地球化学特征。综合分析认为志留纪侵入岩为火山弧花岗岩,是与洋壳俯冲作用有关的产物。
The product of magmatic activity in the Albin mountain area in the southern margin of the Middle Tianshan Terrane may record the interaction between the South Tianshan Ocean and the Middle Tianshan Terrane in Yili, which is of great significance for understanding the subduction of the South Tianshan Ocean. In this paper, petrology, geochemistry and isotope geochronology of Silurian granites in the Albin mountains in the southern margin of the Central Tianshan Terrane are studied. LA-ICP-MS zircon U-Pb dating of 4 samples suggests that these granites were emplaced in Silurian. The rocks are high potassium metaluminous I type granite, belonging to, calc alkaline series. Geochemistry of the rocks suggest that parental magmas may be derived by partial melting of the lower crust. All rocks have similar Chondrite-normalized patterns of rare earth elements(REE) and are enriched in LREE. They are characterized by the enrichment of LILE(Rb, Ba and K) and depletion of high field strength elements(HFSE, such as Nb, Ta, Ti, P), indicative of arc magmatism affinity. Thus, Silurian granitic plutons are arc granites and are related to the subduction of oceanic slab.
The product of magmatic activity in the Albin mountain area in the southern margin of the Middle Tianshan Terrane may record the interaction between the South Tianshan Ocean and the Middle Tianshan Terrane in Yili, which is of great significance for understanding the subduction of the South Tianshan Ocean. In this paper, petrology, geochemistry and isotope geochronology of Silurian granites in the Albin mountains in the southern margin of the Central Tianshan Terrane are studied. LA-ICP-MS zircon U-Pb dating of 4 samples suggests that these granites were emplaced in Silurian. The rocks are high potassium metaluminous I type granite, belonging to, calc alkaline series. Geochemistry of the rocks suggest that parental magmas may be derived by partial melting of the lower crust. All rocks have similar Chondrite-normalized patterns of rare earth elements(REE) and are enriched in LREE. They are characterized by the enrichment of LILE(Rb, Ba and K) and depletion of high field strength elements(HFSE, such as Nb, Ta, Ti, P), indicative of arc magmatism affinity. Thus, Silurian granitic plutons are arc granites and are related to the subduction of oceanic slab.
引文
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Gao J, Klemd R, Qian Q, Zhang X, Li J L, Jiang T, Yang Y Q. 2011. The collision between the Yili and Tarim blocks of the southwestern Altaids: Geochemical and age constraints of a leucogranite dike crosscutting the HP-LT metamorphic belt in the Chinese Tianshan Orogen. Tectonophysics, 499(1-4): 118-131
Ge R F, Zhu W B, Wu H L, Zheng B H, Zhu X Q, He J W. 2012. The Paleozoic northern margin of the Tarim Craton: Passive or active? Lithos, 142-143: 1-15
Jiang T, Gao J, Klemd R, Qian Q, Zhang X, Xiong X M, Wang X S, Tan Z, Chen B X. 2014. Paleozoic ophiolitic mélanges from the South Tianshan Orogen, NW China: Geological, geochemical and geochronological implications for the geodynamic setting. Tectonophysics, 612-613: 106-127
Ludwig K R. 2003. Isoplot/Ex version 3. 0. A geochronological toolkit for Microsoft Excel. BerkeleyGeochronology. No4: 1-70
Maniar P D, Piccoli P M. 1989. Tectonic discrimination of granitoids. GSA Bulletin, 101(5): 635-643
Pearce J A, Harris N B W, Tindle A G. 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, 25(4): 956-983
Pupin J P. 1980. Zircon and granite petrology. Contributions to Mineralogy and Petrology, 73(3): 207-220
Richter F M. 1989. Simple models for trace element fractionation during melt segregation. Earth and Planetary Science Letters, 77(3-4): 333-344
Sun S S, Mcodonough W F. 1989. Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes. Geological Society, London, Special Publications, 42(1): 313-345
Taylor S R, McLennan S M. 1985. The continental crust: Its composition and evolution. Oxford: Blackwell Scientific Publications, 312
Vavra G. 1990. On the kinematics of zircon growth and its petrogenetic significance: A cathodoluminescence study. Contributions to Mineralogy and Petrology, 106(1): 90-99
Wang B, Shu L S, Faure M, Jahn B M, Cluzel D, Charvet J, Chung S L, Meffre S. 2011. Paleozoic tectonics of the southern Chinese Tianshan: Insights from structural, chronological and geochemical studies of the Heiyingshan ophiolitic mélange (NW China). Tectonophysics, 497(1-4): 85-104
Waston E B, Harrison T M. 1983. Zircon saturation revisited: Temperature and composition effects in a variety of crustal magma types. Earth and Planetary Science Letters, 64(2): 295-304
Xiao W J, Huang B C, Han C M, Sun S, Li J L. 2010. A review of the western part of the Altaids: A key to understanding the architecture of accretionary orogens. Gondwana Research, 18(2-3): 253-273
董云鹏, 杨钊, 张国伟, 赵霞, 徐静刚, 姚安平. 2008. 西秦岭关子镇蛇绿岩地球化学及其大地构造意义. 地质学报, 82(9): 1186-1194
高俊, 汤耀庆, 赵民, 王军. 1995. 新疆南天山蛇绿岩的地质地球化学特征及形成环境初探. 岩石学报, 11(S1): 85-97
高俊, 龙灵利, 钱青, 黄德志, 苏文, Klemd R. 2006. 南天山: 晚古生代还是三叠纪碰撞造山带? 岩石学报, 22(5): 1049-1061
高永宝, 李文渊, 李侃, 钱兵, 张照伟, 周安顺, 吴玉诗, 张江伟, 郭周平, 王亚磊. 2012. 东昆仑祁漫塔格白干湖-戛勒赛矿带成岩成矿时代及钨锡成矿作用. 西北地质, 45(4): 229-241
郭瑞清, 尼加提·阿布都逊, 秦切, 贾晓亮, 朱志新, 王克卓, 李亚萍. 2013. 新疆塔里木北缘志留纪花岗岩类侵入岩的地质特征及构造意义. 地质通报, 32(2-3): 220-238
郝金华, 陈建平, 田永革, 李玉龙, 尹京武. 2010. 青海纳日贡玛斑岩钼(铜)矿含矿斑岩矿物学特征及成岩成矿意义. 地质与勘探, 46(3): 368-376
侯可军, 李延河, 田有荣. 2009. LA-MC-ICP-MS锆石微区原位U-Pb定年技术. 矿床地质, 28(4): 481-492
姜常义, 穆艳梅, 赵晓宁, 白开寅, 张虹波. 2001. 塔里木板块北缘活动陆缘型侵入岩带的岩石学与地球化学. 中国区域地质, 20(2): 158-163
穆利修, 王哲, 凤骏, 李平, 屈涛. 2016. 新疆巴音布鲁克地区1∶5万四幅区域地质矿产调查报告. 新疆维吾尔自治区地质调查院
潘桂棠, 肖庆辉, 陆松年, 邓晋福, 冯益民, 张克信, 张智勇, 王方国, 邢光福, 郝国杰, 冯艳芳. 2009. 中国大地构造单元划分. 中国地质, 36(1): 1-16+255
夏林圻, 夏祖春, 徐学义, 李向民, 马中平, 王立社. 2007. 天山岩浆作用. 北京: 中国大地出版社, 1-350
肖序常, 格雷厄姆S A. 1990. 中国西部元古代蓝片岩带: 世界上保存最好的前寒武纪蓝片岩. 新疆地质, 8(1): 12-21
肖序常, 汤耀庆. 1991. 古中亚复合巨型缝合带南缘构造演化. 北京: 北京科学技术出版社, 1-240
赵一珏, 杨经绥, 刘仕军, 刘飞, 田亚洲. 2015. 新疆中天山巴仑台闪长岩成因及其地质意义. 中国地质, 42(5): 1228-1241
朱志新, 王克卓, 郑玉洁, 孙桂华, 张超, 李亚萍. 2006. 新疆伊犁地块南缘志留纪和泥盆纪花岗质侵入体锆石SHRIMP定年及其形成时构造背景的初步探讨. 岩石学报, 22(5): 1193-1200
朱志新. 2007. 新疆南天山地质组成和构造演化. 北京: 中国地质科学院, 1-221
朱志新, 李锦轶, 董连慧, 张晓帆, 胡建卫, 王克卓. 2008. 新疆南天山盲起苏晚石炭世侵入岩的确定及对南天山洋盆闭合时限的限定. 岩石学报, 24(12): 2761-2766
朱志新, 李锦轶, 董莲慧, 张晓帆, 王克卓, 王华星, 赵同阳. 2009. 新疆南天山构造格架及构造演化. 地质通报, 28(12): 1863-1870
Gao J, Klemd R, Qian Q, Zhang X, Li J L, Jiang T, Yang Y Q. 2011. The collision between the Yili and Tarim blocks of the southwestern Altaids: Geochemical and age constraints of a leucogranite dike crosscutting the HP-LT metamorphic belt in the Chinese Tianshan Orogen. Tectonophysics, 499(1-4): 118-131
Ge R F, Zhu W B, Wu H L, Zheng B H, Zhu X Q, He J W. 2012. The Paleozoic northern margin of the Tarim Craton: Passive or active? Lithos, 142-143: 1-15
Jiang T, Gao J, Klemd R, Qian Q, Zhang X, Xiong X M, Wang X S, Tan Z, Chen B X. 2014. Paleozoic ophiolitic mélanges from the South Tianshan Orogen, NW China: Geological, geochemical and geochronological implications for the geodynamic setting. Tectonophysics, 612-613: 106-127
Ludwig K R. 2003. Isoplot/Ex version 3. 0. A geochronological toolkit for Microsoft Excel. BerkeleyGeochronology. No4: 1-70
Maniar P D, Piccoli P M. 1989. Tectonic discrimination of granitoids. GSA Bulletin, 101(5): 635-643
Pearce J A, Harris N B W, Tindle A G. 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, 25(4): 956-983
Pupin J P. 1980. Zircon and granite petrology. Contributions to Mineralogy and Petrology, 73(3): 207-220
Richter F M. 1989. Simple models for trace element fractionation during melt segregation. Earth and Planetary Science Letters, 77(3-4): 333-344
Sun S S, Mcodonough W F. 1989. Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes. Geological Society, London, Special Publications, 42(1): 313-345
Taylor S R, McLennan S M. 1985. The continental crust: Its composition and evolution. Oxford: Blackwell Scientific Publications, 312
Vavra G. 1990. On the kinematics of zircon growth and its petrogenetic significance: A cathodoluminescence study. Contributions to Mineralogy and Petrology, 106(1): 90-99
Wang B, Shu L S, Faure M, Jahn B M, Cluzel D, Charvet J, Chung S L, Meffre S. 2011. Paleozoic tectonics of the southern Chinese Tianshan: Insights from structural, chronological and geochemical studies of the Heiyingshan ophiolitic mélange (NW China). Tectonophysics, 497(1-4): 85-104
Waston E B, Harrison T M. 1983. Zircon saturation revisited: Temperature and composition effects in a variety of crustal magma types. Earth and Planetary Science Letters, 64(2): 295-304
Xiao W J, Huang B C, Han C M, Sun S, Li J L. 2010. A review of the western part of the Altaids: A key to understanding the architecture of accretionary orogens. Gondwana Research, 18(2-3): 253-273
董云鹏, 杨钊, 张国伟, 赵霞, 徐静刚, 姚安平. 2008. 西秦岭关子镇蛇绿岩地球化学及其大地构造意义. 地质学报, 82(9): 1186-1194
高俊, 汤耀庆, 赵民, 王军. 1995. 新疆南天山蛇绿岩的地质地球化学特征及形成环境初探. 岩石学报, 11(S1): 85-97
高俊, 龙灵利, 钱青, 黄德志, 苏文, Klemd R. 2006. 南天山: 晚古生代还是三叠纪碰撞造山带? 岩石学报, 22(5): 1049-1061
高永宝, 李文渊, 李侃, 钱兵, 张照伟, 周安顺, 吴玉诗, 张江伟, 郭周平, 王亚磊. 2012. 东昆仑祁漫塔格白干湖-戛勒赛矿带成岩成矿时代及钨锡成矿作用. 西北地质, 45(4): 229-241
郭瑞清, 尼加提·阿布都逊, 秦切, 贾晓亮, 朱志新, 王克卓, 李亚萍. 2013. 新疆塔里木北缘志留纪花岗岩类侵入岩的地质特征及构造意义. 地质通报, 32(2-3): 220-238
郝金华, 陈建平, 田永革, 李玉龙, 尹京武. 2010. 青海纳日贡玛斑岩钼(铜)矿含矿斑岩矿物学特征及成岩成矿意义. 地质与勘探, 46(3): 368-376
侯可军, 李延河, 田有荣. 2009. LA-MC-ICP-MS锆石微区原位U-Pb定年技术. 矿床地质, 28(4): 481-492
姜常义, 穆艳梅, 赵晓宁, 白开寅, 张虹波. 2001. 塔里木板块北缘活动陆缘型侵入岩带的岩石学与地球化学. 中国区域地质, 20(2): 158-163
穆利修, 王哲, 凤骏, 李平, 屈涛. 2016. 新疆巴音布鲁克地区1∶5万四幅区域地质矿产调查报告. 新疆维吾尔自治区地质调查院
潘桂棠, 肖庆辉, 陆松年, 邓晋福, 冯益民, 张克信, 张智勇, 王方国, 邢光福, 郝国杰, 冯艳芳. 2009. 中国大地构造单元划分. 中国地质, 36(1): 1-16+255
夏林圻, 夏祖春, 徐学义, 李向民, 马中平, 王立社. 2007. 天山岩浆作用. 北京: 中国大地出版社, 1-350
肖序常, 格雷厄姆S A. 1990. 中国西部元古代蓝片岩带: 世界上保存最好的前寒武纪蓝片岩. 新疆地质, 8(1): 12-21
肖序常, 汤耀庆. 1991. 古中亚复合巨型缝合带南缘构造演化. 北京: 北京科学技术出版社, 1-240
赵一珏, 杨经绥, 刘仕军, 刘飞, 田亚洲. 2015. 新疆中天山巴仑台闪长岩成因及其地质意义. 中国地质, 42(5): 1228-1241
朱志新, 王克卓, 郑玉洁, 孙桂华, 张超, 李亚萍. 2006. 新疆伊犁地块南缘志留纪和泥盆纪花岗质侵入体锆石SHRIMP定年及其形成时构造背景的初步探讨. 岩石学报, 22(5): 1193-1200
朱志新. 2007. 新疆南天山地质组成和构造演化. 北京: 中国地质科学院, 1-221
朱志新, 李锦轶, 董连慧, 张晓帆, 胡建卫, 王克卓. 2008. 新疆南天山盲起苏晚石炭世侵入岩的确定及对南天山洋盆闭合时限的限定. 岩石学报, 24(12): 2761-2766
朱志新, 李锦轶, 董莲慧, 张晓帆, 王克卓, 王华星, 赵同阳. 2009. 新疆南天山构造格架及构造演化. 地质通报, 28(12): 1863-1870
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