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地质学报  2004 

内蒙古苏左旗地区闪长―花岗岩类SHRIMP年代学

, PP. 789-799

Keywords: 苏左旗,白音宝力道,包尔汗喇嘛庙,花岗岩,SHRIMP年代学

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Abstract:

本文对内蒙古苏左旗地区的闪长-花岗岩类进行了精确的SHRIMP定年研究。研究表明,富钠的白音宝力道岩体是一个多期次侵入的复合岩体,主体可能是490~464Ma之间侵位的,推测是洋壳俯冲的产物;随后在424Ma左右该地区发生了板块的碰撞事件,产生具高钾钙碱性系列的花岗岩。该区富钾的包尔汗喇嘛庙岩体本次得到的SHRIMP年龄为222~204Ma,表明其在晚三叠世侵位,可能代表了造山期后的岩石圈拆沉事件。

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