准噶尔盆地西北缘布尔克斯台蛇绿岩特征及地质意义  

Characteristics and Geological Significance of the Buerkesitai Ophiolite in the Northwestern Margin of Junggar Basin

作　　者：邹国庆[1] 潘飞[1,2] 余牛奔 黄修保 ZOU Guo-qing;PAN Fei;YU Niu-ben;HUANG Xiu-bao(Northwest Jiangxi Bureau of Geology and Mineral Exploration and Development, Jiujiang 332000, China;School of Earth Science and Engineering, Nanjing University, Nanjing 210000, China;Jiangxi Bureau of Geology and Mineral Exploration and Development, Nanchang 330000, China)

机构地区：[1]江西省地质矿产勘查开发局赣西北大队,江西九江332000 [2]南京大学地球科学与工程学院,江苏南京210000 [3]江西省地质矿产勘查开发局,江西南昌330000

出　　处：《东华理工大学学报（自然科学版）》2021年第5期412-422,共11页Journal of East China University of Technology(Natural Science)

基　　金：中央返还两权价款基金资助项目(A15-1-LQ04)。

摘　　要：为了研究西准噶尔古生代洋壳的地质背景,对该区蛇绿岩开展野外地质调查、锆石SHRIMP测年及区域对比分析等研究方法。结果显示,新发现的蛇绿岩形成于中晚寒武纪中奥陶纪与早中泥盆纪2个时代,其与西准噶尔唐巴勒蛇绿岩克拉玛依蛇绿岩和达尔布特蛇绿岩可以对比连接。西准噶尔可能不存在志留纪洋壳,但可能存在前寒武纪洋壳物质。本区蛇绿岩可能属于俯冲消减的岛弧与弧后盆地环境,其类型属于俯冲带上盘型(SSZ)。本研究成果为研究该区古生代构造环境提供依据。In order to study the geological background of the Paleozoic ocean basin in West Junggar,field geological survey,zircon SHRIMP dating and regional comparative analysis were carried out for the ophiolites in this area.The results show that the newly discovered ophiolite was formed in the middle and late Cambrian-middle Ordovician and early and Middle Devonian.It can be connected with Tangbala ophiolite-Karamay ophiolite and Darbute ophiolite in western Junggar.Oceanic crust of Silurian may not exist in West Junggar,but oceanic crust of Precambrian may exist.The ophiolite in this area may belong to subducted island arc and back arc basin environment,and its type belongs to Supra-subduction zone(SSZ).The research results provide a basis for studying the Paleozoic tectonic environment in this area.

关 键 词：蛇绿岩 早古生代 晚古生代 弧后盆地 准噶尔盆地西北缘 

分 类 号：P588.3[天文地球—岩石学]