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北阿尔金地区早古生代有限洋盆开启时限:来自斜长花岗岩的证据

, PP. 359-368

Keywords: 斜长花岗岩,有限洋盆,早古生代,北阿尔金地区

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Abstract:

?红柳沟-拉配泉蛇绿构造混杂岩带中的斜长花岗岩野外地质、岩相学、岩石学、地球化学和锆石组成的综合研究表明,红柳沟斜长花岗岩为洋壳运移过程中含水条件下镁铁质岩石发生角闪岩相变质作用后部分熔融形成的;该类花岗岩锆石年龄代表了与洋壳扩张同期或者稍晚于洋壳扩张时代的洋盆的扩展时代;红柳沟斜长花岗岩LA-ICP-MSU-Pb年龄为(512.1±1.5)Ma,这一结果表明红柳沟-拉配泉有限洋盆的开启时限为中寒武世.

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