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西藏休古嘎布蛇绿岩中辉绿岩锆石SHRIMP定年及其地质意义

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Keywords: 锆石SHRIMP定年,地质意义,休古嘎布蛇绿岩,西藏

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Abstract:

应用SHRIMPⅡ锆石U-Pb法,对西藏休古嘎布蛇绿岩中的辉绿岩墙进行了测年,获得辉绿岩形成年龄为122.3±2.4Ma。该年龄代表了休古嘎布-达巴特提斯洋盆的形成时代,与雅鲁藏布江缝合带中段洋盆形成时代(126±1.5Ma)相当,此结果对于确定研究区特提斯洋盆的古构造格局及其发育演化过程等提供了重要的年代学制约。

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