藏南仲巴地体早奥陶世构造—热事件及其地质意义

被引：12

作者：

刘强 ^{[1
,2
,3
]}

邓玉彪 ^{[1
,2
]}

向树元 ^{[1
,2
]}

李华亮 ^{[4
]}

机构：

[1] 中国地质大学全球大地构造中心

[2] 中国地质大学地球科学学院

[3] 中国地质调查局青藏高原地质研究中心

[4] 东华理工大学地球科学学院

来源：

地球科学 | 2017年 / 42卷 / 06期

关键词：

片麻状二长花岗岩; 仲巴地体; 雅鲁藏布江缝合带; 藏南; 岩石学;

D O I：

暂无

中图分类号：

P534.42 [奥陶纪（系）];

学科分类号：

070903 ;

摘要：

仲巴地体是雅鲁藏布江缝合带西段南北蛇绿岩带之间的重要构造单元,目前对其是否存在早古生代构造-热事件记录及构造属性判别尚不明确.通过野外观测、岩石地球化学研究和年代学分析,在仲巴地体中段的公珠错一带识别出一套侵入到黑云斜长片麻岩中的片麻状二长花岗岩,其锆石U-Pb年龄为478Ma,表明岩石形成时代为早奥陶世;该套花岗岩具有高Si、富Al和总碱含量较高的特点,铝饱和指数A/CNK=1.13～1.20,富集大离子亲石元素Rb、K,相对亏损Ba、Sr、Nb、Ti等,属于钙碱性强过铝质花岗岩.这是首次在雅鲁藏布江缝合带西段仲巴地体内部识别出代表早奥陶世构造-热事件的地质记录,该套花岗岩形成过程与原特提斯洋向冈瓦纳大陆北缘俯冲结束后的上地壳熔融相关,证明仲巴地体在早古生代应为东冈瓦纳大陆北缘的组成部分.

引用

页码：881 / 890

页数：10

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