新疆中天山艾尔宾山新元古代侵入岩浆活动及构造意义  

Neoproterozoic Intrusive Magmatism and Its Tectonic Significance of Aierbin Mountain of Central Tianshan Mountains in Xinjiang

作　　者：李平 穆利修 赵同阳 王哲 黄剑[2] 屈涛 凤骏 Li Ping;Mu Lixiu;Zhao Tongyang;Wang Zhe;Huang Jian;Qu Tao;Feng Jun(Xinjiang Institute of Geological Survey,Urumqi,Xinjiang,830000,China;XinJiang University,Urumqi,Xinjiang,830047,China)

机构地区：[1]新疆维吾尔自治区地质调查院,新疆乌鲁木齐830000 [2]新疆大学,新疆乌鲁木齐830047

出　　处：《新疆地质》2017年第4期364-372,共9页Xinjiang Geology

基　　金：中国地质调查局地质调查项目(12120114058701);新疆区域地质调查片区总结与服务产品开发(DD20160345-04)联合资助

摘　　要：新疆巴音布鲁克艾尔宾山地区主要出露华力西期花岗质侵入体及晚古生代地层,原大地构造属性为艾尔宾山碳酸盐岩台地。通过LA-ICP-MS锆石U-Pb年代学研究,获得艾尔宾山地区片麻状二长花岗岩和片麻状正长花岗岩的成岩年龄分别为(802.0±5.2)Ma和(803.2±9.3)Ma,成岩时代为新元古代早期。经岩石地球化学研究与区域对比分析认为,该期侵入岩由下-中地壳角闪岩相发生部分熔融派生形成,热源由罗丁尼亚大陆裂解伴随的地幔柱活动产生的幔源岩浆提供,物质来源为早期哥伦比亚超级大陆碰撞聚合及罗丁尼亚大陆聚合形成的壳源物质。结合最新区域地质调查成果,将原中天山南缘断裂由艾尔宾山北坡移至艾尔宾山南坡,大地构造属性为中天山多期复合岩浆弧。It mainly exposed Hercynian granitoids and late Paleozoic strata of Aierbin Mountain of Bayinbuluke area,in Xinjiang.The original tectonic attribute is the Aierbin Mountain carbonate platform.Through study of zircon U-Pb chronology by LA-ICP-MS,the ages of the gneissic monzonitic granite and gneisson-shaped granite in the Aierbin Mountain were(802.0±5.2)Ma and(803.2±9.3)Ma,respectively.Geochemistry and regional comparison shows that the Neoproterozoic intrusive rocks are derived from the partial melting of the lower-middle crustal amphibolite facies,and the heat source is provided by the mantle-derived magma produced by the mantle plume associated with breakup of Rodinia supercontinent.The source material is crust material from the polymerization source of Colombian supercontinent and Rodinia supercontinent.Combined with the latest regional geological survey results,the southern Centrel Tianshan Suture should be moved from northern to southern slope of the Aierbin Mountain,and tectonic attribute of Aierbin Mountain belongs to multi-period composite magma arc in centrel Tianshan Mountains.

关 键 词：中天山南缘断裂 艾尔宾山 巴音布鲁克 新元古代 罗丁尼亚大陆裂解 

分 类 号：P534.3[天文地球—古生物学与地层学] P588.12[天文地球—地质学]