可可西里地区蛇形沟一带蛇绿岩的物质组成及大地构造的意义  

The significance of geotectonic and its substance of the ophiolites in Shexing channel of Kekexili

作　　者：欧阳光文[1] 保广普[1] 付军[1] 

机构地区：[1]青海省地质调查院区调所,青海省西宁市810012

出　　处：《中国科技信息》2013年第1期35-36,39,共3页China Science and Technology Information

摘　　要：在可可西里地区蛇形沟一带发现的蛇绿岩主要由辉长岩、辉绿岩、玄武岩三种岩石组成,岩石呈段块出露。根据目前已获得的蛇绿岩的同位素资料反映,约在晚泥盆世晚期(347Ma)开始裂解,早二叠末或更早一些金沙江洋形成。到晚二叠世末期—早三叠世汉台山群磨拉石建造出现,标志着碰撞造山作用发生,金沙江洋闭合。The ophiolites which were found in Shexing channel of Kekexili were composed of gabbro dolerite basaltand its came out segment. The discover of ophiolites have proved the presence of big ocean in Shexing channel and splited in late Devonian Epoch （547Ma） .The dingsha river was formed in early Permian Epoch or earlier on the basis of the data of isotopes of the ophiolites. The molasse fabrication of Hantai mountain groups appeared from late Permian Epoch to early Triassic Epoch, which indicated the collisiona orogen and the closeof Jingsha river.

关 键 词：蛇形沟 蛇绿岩 同位素 金沙江洋 

分 类 号：P588[天文地球—岩石学]