西南天山柯坪地区萨尔干基性岩脉U-Pb年代学及地球化学特征
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摘要
柯坪地区发育一套沿走滑断层侵位的萨尔干基性岩脉,其产出于西南天山造山带与塔里木克拉通的接触部位,具有重要的意义。文章通过对萨尔干基性岩脉样品进行锆石LA-ICP-MS U-Pb年代学、岩石地球化学分析,探讨西南天山中新生代陆内造山作用过程。结果表明,萨尔干基性岩脉的LA-ICP-MS锆石U-Pb年龄为(49. 14±0. 8) Ma,表明该套岩石形成于始新世。地球化学表明该套岩石形成于与青藏高原碰撞远程效应相关的构造背景。
There is a set of mafic rocks developed along the Saergan strike-slip faults in the Keping area,which is of great significance to understanding the internal relations between the southwest Tianshan orogenic belt and the Tarim Craton. The zircon U-Pb geochronology and geochemical analysis of the Saergan Mafic rocks are used to investigate the effect of the Cenozoic intracontinental orogeny process of the Southwest Tianshan orogenic belt. The zircon LA-ICP-MS U-Pb age of the Saergan mafic rock is 49. 14±0. 8 Ma,indicating that the mafic rocks were formed in Eocene. Geochemistry data shows that the rocks have an important relationship with the remote effects of the collision between the Indian plate and the Eurasian plate.
There is a set of mafic rocks developed along the Saergan strike-slip faults in the Keping area,which is of great significance to understanding the internal relations between the southwest Tianshan orogenic belt and the Tarim Craton. The zircon U-Pb geochronology and geochemical analysis of the Saergan Mafic rocks are used to investigate the effect of the Cenozoic intracontinental orogeny process of the Southwest Tianshan orogenic belt. The zircon LA-ICP-MS U-Pb age of the Saergan mafic rock is 49. 14±0. 8 Ma,indicating that the mafic rocks were formed in Eocene. Geochemistry data shows that the rocks have an important relationship with the remote effects of the collision between the Indian plate and the Eurasian plate.
引文
[1]SENG?R,A M C,NATAL'IN B A,BURTMAN V S.Evolution of the Altaid tectonic collage and Palaeozoic crustal growth in Eurasia[J].Nature,1993,364(6435):299-307.
[2]KLEMD R,GAO J,LI J L,et al.Metamorphic evolution of(ultra)-high-pressure subduction-related transient crust in the South Tianshan Orogen(Central Asian Orogenic Belt):Geodynamic implications[J].Gondwana Research,2015,28(1):1-25.
[3]CHEN Z L,WANG Z X,HAN F B,et al.Late cretaceousCenozoic uplift,deformation,and erosion of the SW Tianshan mountains in Kyrgyzstan and Western China[J].International Geology Review,2017,60(8):1019-1037.
[4]XIAO W J,WINDLEY B F,ALLEN M B,et al.Paleozoic multiple accretionary and collisional tectonics of the Chinese Tianshan orogenic collage[J].Gondwana Research,2013,23(4):1316-1341.
[5]KR?NER A,WINDLEY B F,BADARCH G,et al.Accretionary growth and crust formation in the Central Asian Orogenic Belt and comparison with the Arabian-Nubian shield[M]//HATCHER R D JR,CARLSON M P,MCBRIDE J H,et al.4-D Framework of Continental Crust.Geological Society of America,2007,200:182-209.
[6]曲国胜,李亦纲,陈杰,等.柯坪塔格推覆构造几何学、运动学及其构造演化[J].地学前缘,2003,10(S1):142-152.QU Guosheng,LI Yigang,CHEN Jie,et al.Geometry,kinematics and tectonic evolution of Kepingtage thrust system[J].Earth Science Frontiers,2003,10(S1):142-152.(in Chinese with English abstract)
[7]李忠,高剑.构造活动区特征源汇体系及古地理重建:以塔里木块体北缘记录“泛非”事件的碎屑锆石分析为例[J].古地理学报,2016,18(3):424-440.LI Zhong,GAO Jian.Characteristic source-sink systems and palaeogeographic reconstruction in active tectonic regions:Acase research on detrital zircons recording the Pan-African event in northern Tarim Block[J].Journal of Palaeogeography,2016,18(3):424-440.(in Chinese with English abstract)
[8]肖文交,舒良树,高俊,等.中亚造山带大陆动力学过程与成矿作用[J].新疆地质,2008,26(1):4-8.XIAO Wenjiao,SHU Liangshu,GAO Jun,et al.Continental dynamics of the central Asian orogenic belt and its metallogeny[J].Xinjiang Geology,2008,26(1):4-8.(in Chinese with English abstract)
[9]陈宣华,杨农,叶宝莹,等.中亚成矿域多核成矿系统西准噶尔成矿带构造体系特征及其对成矿作用的控制[J].大地构造与成矿学,2011,35(3):325-338.CHEN Xuanhua,YANG Nong,YE Baoying,et al.Tectonic system and its control on metallogenesis in Western Junggar as part of the central Asia multi-core metallogenic system[J].Geotectonica et Metallogenia,2011,35(3):325-338.(in Chinese with English abstract)
[10]薛春纪,赵晓波,莫宣学.中亚成矿域斑岩铜金成矿的地质环境问题[J].岩石学报,2016,32(5):1249-1261.XUE Chunji,ZHAO Xiaobo,MO Xuanxue.Problem on porphyry Cu-Au metallogenic environment in Central Asian:an overview[J].Acta Petrologica Sinica,2016,32(5):1249-1261.(in Chinese with English abstract)
[11]MIDDLEMOST E A K.Naming materials in the magma/igneous rock System[J].Earth-Science Reviews,1994,37(3-4):215-224.
[12]SUN S S,MCDONOUGH W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[J].Geological Society,London,Special Publications,1989,42(1):313-345.
[13]WU Y B,ZHENG Y F.Genesis of zircon and its constraints on interpretation of U-Pb age[J].Chinese Science Bulletin,2004,49(15):1554-1569.
[14]季建清,韩宝福,朱美妃,等.西天山托云盆地及周边中新生代岩浆活动的岩石学、地球化学与年代学研究[J].岩石学报,2006,22(5):1324-1340.JI Jianqing,HAN Baofu,ZHU Meifei,et al.CretaceousPaleogene alkaline magmatism in Tuyon basin,southwest Tianshan mountains:geochronology,petrology and geochemistry[J].Acta Petrologica Sinica,2006,22(5):1324-1340.(in Chinese with English abstract)
[15]徐学义,夏林圻,夏祖春,等.西南天山托云地区白垩纪-早第三纪玄武岩地球化学及其成因机制[J].地球化学,2003,32(6):551-560.XU Xueyi,XIA Linqi,XIA Zuchun,et al.Geochemistry and genesis of Cretaceous-Paleogene basalts from the Tuoyun Basin,Southwest Tianshan Mountains[J].Geochimia,2003,32(6):551-560.(in Chinese with English abstract)
[16]PEARCE J A.Immobile element fingerprinting of Ophiolites[J].Elements,2014,10(2):101-108.
[2]KLEMD R,GAO J,LI J L,et al.Metamorphic evolution of(ultra)-high-pressure subduction-related transient crust in the South Tianshan Orogen(Central Asian Orogenic Belt):Geodynamic implications[J].Gondwana Research,2015,28(1):1-25.
[3]CHEN Z L,WANG Z X,HAN F B,et al.Late cretaceousCenozoic uplift,deformation,and erosion of the SW Tianshan mountains in Kyrgyzstan and Western China[J].International Geology Review,2017,60(8):1019-1037.
[4]XIAO W J,WINDLEY B F,ALLEN M B,et al.Paleozoic multiple accretionary and collisional tectonics of the Chinese Tianshan orogenic collage[J].Gondwana Research,2013,23(4):1316-1341.
[5]KR?NER A,WINDLEY B F,BADARCH G,et al.Accretionary growth and crust formation in the Central Asian Orogenic Belt and comparison with the Arabian-Nubian shield[M]//HATCHER R D JR,CARLSON M P,MCBRIDE J H,et al.4-D Framework of Continental Crust.Geological Society of America,2007,200:182-209.
[6]曲国胜,李亦纲,陈杰,等.柯坪塔格推覆构造几何学、运动学及其构造演化[J].地学前缘,2003,10(S1):142-152.QU Guosheng,LI Yigang,CHEN Jie,et al.Geometry,kinematics and tectonic evolution of Kepingtage thrust system[J].Earth Science Frontiers,2003,10(S1):142-152.(in Chinese with English abstract)
[7]李忠,高剑.构造活动区特征源汇体系及古地理重建:以塔里木块体北缘记录“泛非”事件的碎屑锆石分析为例[J].古地理学报,2016,18(3):424-440.LI Zhong,GAO Jian.Characteristic source-sink systems and palaeogeographic reconstruction in active tectonic regions:Acase research on detrital zircons recording the Pan-African event in northern Tarim Block[J].Journal of Palaeogeography,2016,18(3):424-440.(in Chinese with English abstract)
[8]肖文交,舒良树,高俊,等.中亚造山带大陆动力学过程与成矿作用[J].新疆地质,2008,26(1):4-8.XIAO Wenjiao,SHU Liangshu,GAO Jun,et al.Continental dynamics of the central Asian orogenic belt and its metallogeny[J].Xinjiang Geology,2008,26(1):4-8.(in Chinese with English abstract)
[9]陈宣华,杨农,叶宝莹,等.中亚成矿域多核成矿系统西准噶尔成矿带构造体系特征及其对成矿作用的控制[J].大地构造与成矿学,2011,35(3):325-338.CHEN Xuanhua,YANG Nong,YE Baoying,et al.Tectonic system and its control on metallogenesis in Western Junggar as part of the central Asia multi-core metallogenic system[J].Geotectonica et Metallogenia,2011,35(3):325-338.(in Chinese with English abstract)
[10]薛春纪,赵晓波,莫宣学.中亚成矿域斑岩铜金成矿的地质环境问题[J].岩石学报,2016,32(5):1249-1261.XUE Chunji,ZHAO Xiaobo,MO Xuanxue.Problem on porphyry Cu-Au metallogenic environment in Central Asian:an overview[J].Acta Petrologica Sinica,2016,32(5):1249-1261.(in Chinese with English abstract)
[11]MIDDLEMOST E A K.Naming materials in the magma/igneous rock System[J].Earth-Science Reviews,1994,37(3-4):215-224.
[12]SUN S S,MCDONOUGH W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[J].Geological Society,London,Special Publications,1989,42(1):313-345.
[13]WU Y B,ZHENG Y F.Genesis of zircon and its constraints on interpretation of U-Pb age[J].Chinese Science Bulletin,2004,49(15):1554-1569.
[14]季建清,韩宝福,朱美妃,等.西天山托云盆地及周边中新生代岩浆活动的岩石学、地球化学与年代学研究[J].岩石学报,2006,22(5):1324-1340.JI Jianqing,HAN Baofu,ZHU Meifei,et al.CretaceousPaleogene alkaline magmatism in Tuyon basin,southwest Tianshan mountains:geochronology,petrology and geochemistry[J].Acta Petrologica Sinica,2006,22(5):1324-1340.(in Chinese with English abstract)
[15]徐学义,夏林圻,夏祖春,等.西南天山托云地区白垩纪-早第三纪玄武岩地球化学及其成因机制[J].地球化学,2003,32(6):551-560.XU Xueyi,XIA Linqi,XIA Zuchun,et al.Geochemistry and genesis of Cretaceous-Paleogene basalts from the Tuoyun Basin,Southwest Tianshan Mountains[J].Geochimia,2003,32(6):551-560.(in Chinese with English abstract)
[16]PEARCE J A.Immobile element fingerprinting of Ophiolites[J].Elements,2014,10(2):101-108.