东准噶尔玛因鄂博蛇绿混杂岩形成时代确定  

ZIRCONS SHRIMP U-PB DATING OF MAYINERBUO OPHILIT ANDIT'SGEOLOGICAL IMPLICATIONS

作　　者：刘崴国[1] 

机构地区：[1]新疆地质矿产勘查开发局第一区域地质调查大队,新疆乌鲁木齐830013

出　　处：《新疆地质》2011年第4期385-388,共4页Xinjiang Geology

基　　金：中国地质调查局国土资源大调查项目(1212010911055)资助

摘　　要：玛因鄂博蛇绿混杂岩位于额尔齐斯-玛因鄂博板块缝合带内,由枕状基性熔岩、辉长质杂岩、深海沉积物等组成,与基质岩石构成蛇绿混杂增生岩楔.对层状辉长岩、枕状玄武岩进行锆石SHRIMP U-Pb测年,谐和年龄分别为403 Ma和397 Ma,证实玛因鄂博蛇绿混杂岩为北天山洋盆(古亚洲洋中支)在晚志留—早泥盆世的残余.Mayinerbuo Ophilit located in Ertix-Mayinerbuo tectonic zone,layered gabbro and pillow basalt were dated using SHRIMP U-Pb method.The results indicate that concordant ages with a mean206pb/238U age of 397±6 and 403±5 Ma, indieates that the Mayinerbuo Ophilit was supposed as relies of ocean basin in the northern Tianshan Mountains（Middle Palaeo-Asian oceanic crust）of the Late Silurian-Early Devonnian.the post orogenic pluton suggested that the collision of Siberia plate and Kazakhstan-Jungger plate before Early Permian.

关 键 词：玛因鄂博 板块缝合带 层状辉长岩 枕状玄武岩 锆石SHRIMP U-PB测年 

分 类 号：P588.125[天文地球—岩石学]