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地球学报  2004 

湘南西山花岗质火山-侵入杂岩形成时代的确定

Keywords: 火山-侵入杂岩,离子探针UPb年龄,全岩Rb-Sr年龄,湖南

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Abstract:

湖南南部西山火山侵入杂岩中3个代表性岩石单元(花岗岩、碎斑熔岩和流纹岩)的产状、岩石化学、微量元素和同位素地球化学特征显示,它们同空间、同物质来源。全岩RbSr定年结果表明:花岗岩、碎斑熔岩和流纹岩的形成时代分别为156±6Ma、159±2Ma和154±11Ma,87Sr/86Sr初始值分别为0.71779、0.71738和0.71774,其中碎斑熔岩的锆石SHRIMP定年结果为156±2Ma,它们在误差范围内基本相同,为中侏罗世晚期同一构造岩浆事件中陆壳活化的产物。

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