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地质学报  2011 

藏南江孜县白沙地区宗卓混杂岩:岩石组成与物源区分析

, PP. 1343-1351

Keywords: 藏南宗卓混杂岩岩石学物源区

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Abstract:

藏南宗卓混杂岩是雅鲁藏布缝合带的重要组成部分。本文对江孜县白沙地区宗卓混杂岩进行了详细的野外和室内岩石学研究。该混杂岩主要由岩块和“基质”组成,岩块岩石类型有砂岩、硅质岩、玄武岩、砾岩等,“基质”主要以未变质的黑色页岩、泥岩为主。砂岩碎屑统计显示,其碎屑成分为火山岩屑和沉积岩屑,与日喀则弧前盆地类似。砂岩碎屑锆石年代学研究表明,其年龄峰值主要分布在70-110Ma,与冈底斯弧的年龄值相同。另外,砂岩中最年轻锆石年龄为62±1Ma,说明混杂岩形成的时间可延续到古新世。物源区分析表明,宗卓混杂岩内的大量砂岩物源来自于缝合带北侧的冈底斯火山弧,并且是在印度板块与欧亚板块碰撞背景下形成的一套混杂岩。

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