新疆北部额尔齐斯准蛇绿岩地球化学及年代学特征  

Northern Xinjiang Irtysh Sizhun ophiolite geochemistry and geochronology

作　　者：苏延龙 刘崴国 于洋 

机构地区：[1]新疆第一区域地质调查大队,新疆乌鲁木齐830011

出　　处：《世界有色金属》2017年第20期248-249,共2页World Nonferrous Metals

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

摘　　要：额尔齐斯准蛇绿岩由洋脊玄武岩、辉长质杂岩、辉石安山岩、玻镁安山岩、放射虫硅质岩、锰铁质硅质岩组成。镁铁质火山岩与放射虫硅质岩伴生,岩石化学图解显示具有镁铁质堆积岩的特征,稀土元素配分图与典型洋中脊玄武岩相似,新获得玄武岩锆石SHRIMP U-Pb和谐年龄为322±9Ma(95%conf.,n=23,MSWD=1.3)时代为中石炭世早期。经构造环境判别,镁铁质火山岩总体反映出洋中脊向造山带过渡的环境,属于弧盆系演化的过程。The Ertix Sizhun ophiolite consists of oceanic ridge basalt, gabbro complex, pyroxene andesite, boninite,radiolarian siliceous rocks, siliceous rocks composed of iron and manganese. Mafic volcano rocks and radiolarian siliceous rocks associated with the rock chemistry graphic display has the characteristics of mafic cumulate rocks, REE diagram and typical MORB basalt is similar to that of new zircon SHRIMP U-Pb harmonious age 322 ＋ 9 Ma（95%conf., n=23,MSWD=1.3） to Early Carboniferous in age. The tectonic discrimination, mafic volcano rocks reflect the overall environment abroad ridge transition to the orogenic belt, which belongs to the process of the evolution of the arc basin system.

关 键 词：新疆北部 额尔齐斯 准蛇绿岩 

分 类 号：P597[天文地球—地球化学]