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地质学报  2003 

内蒙古图林凯蛇绿岩中埃达克岩SHRIMP测年:早古生代洋壳消减的证据

, PP. 317-327

Keywords: 内蒙古埃达克岩蛇绿岩SHRIMP年龄早古生代

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Abstract:

内蒙古图林凯蛇绿岩中,新发现了埃达克岩,岩性包括石英闪长岩、奥长花岗岩、斜长岩和英安岩。它们是温都尔庙―图林凯早古生代消减带的一种岩浆岩标志。精确的SHRIMPU-Pb测年表明:①石英闪长岩侵位于约467±13Ma,说明温都尔庙古洋壳的消减可能始于约467±13Ma或更早。随后不久,这一岩石经历了约451±18Ma的高级变质和部分熔融事件。②英安岩喷发于约459±8Ma,奥长花岗岩形成略晚,约451±7Ma,最后形成了斜长岩的岩墙,其时代约为429±7Ma。据此认为,温都尔庙―图林凯古洋壳在早古生代时期,经历了愈38Ma的消减事件。

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