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地质论评  2005 

北天山巴音沟蛇绿岩斜长花岗岩锆石SHRIMP测年及其意义

Keywords: 斜长花岗岩,巴音沟蛇绿岩,SHRIMP,早石炭世

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Abstract:

北天山巴音沟蛇绿岩中斜长花岗岩仅产于辉长岩顶部,二者呈突变或渐变接触关系。本文应用SHRIMP方法对斜长花岗岩进行了锆石U―Pb定年,获得了324.8±7.1Ma(2d)的年龄,这一年龄精确反映了巴音沟蛇绿岩形成于早石炭世。巴音沟蛇绿岩代表了天山晚古生代“红海型”洋盆的地质记录。

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