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地质论评  2004 

西昆仑库地伟晶辉长岩和玄武岩锆石SHRIMP年龄:库地蛇绿岩的解体

Keywords: SHRIMP库地蛇绿岩锆石西昆仑玄武岩辉长岩超镁铁岩解体年代资料

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Abstract:

西昆仑“库地蛇绿岩“是中国西部地区研究程度较高的蛇绿岩之一。对这条蛇绿岩带的时代、构造背景至今存在很大分歧。笔者等在库地超镁铁岩体中,获得侵入于橄榄岩中的伟晶辉长岩锆石SHRIMP年龄为525±2.9Ma,在库地一些克沟获得块状玄武岩锆石SHRIMP年龄为428±19Ma,这表明库地超镁铁岩和库地一些克沟玄武岩不属于同一时代,因此它们可能形成的构造背景也存在差异,库地蛇绿岩应解体。本文提供的年代资料为研究这一地区的早古生代构造演化提供了新的资料

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