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地质论评  2006 

冈底斯带门巴花岗岩同位素测年及其对新特提斯洋俯冲时代的约束

Keywords: SHRIMP锆石U-Pb年龄,40Ar/,39Ar年龄门巴花岗岩新特提斯洋冈底斯

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Abstract:

本文应用单颗粒锆石SHRIMPU―Pb法和角闪石^40Ar/^39Ar法,对出露在冈底斯构造带上的门巴花岗岩体进行了同位素测年,时代分别为207Ma和215Ma,表明它们形成于晚印支期。地质与地球化学研究显示该时期形成的岩体主要为黑云角闪花岗闪长岩和黑云母二长花岗岩,它们形成于岛弧环境,与其南侧墨竹工卡一带出露的晚三叠世钙碱性火山岩(叶巴组)共同构成与板块俯冲有关的特征性岩石组合,揭示新特提斯洋的俯冲时代应早于晚三叠世。

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