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地质学报  2010 

内蒙古中部四子王旗地区晚二叠-早三叠世过铝花岗岩定年及成因

, PP. 1002-1016

Keywords: 锆石UPb定年,过铝花岗岩,四子王旗,内蒙古

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Abstract:

研究区位于华北板块北缘中段,紧邻兴蒙造山带,是研究古生代―中生代地壳增生演化的重要地区。本文对区内三个花岗岩体进行了锆石LAICPMSUPb定年及岩石地球化学研究。结果表明阿玛乌苏花岗闪长岩形成于267±9Ma(MSWD=9.7);布龙二长花岗岩和格尔图白云母正长花岗岩分别侵位于239±4Ma和238±6Ma(MSWD=0.91);而侵入格尔图白云母正长花岗岩的白云母二长花岗岩脉则获得了224±8Ma(MSWD=5.7)的侵位年龄。岩石地球化学特征显示阿玛乌苏花岗闪长岩为岩浆混合成因,暗示大规模岩浆底侵作用的存在;格尔图白云母正长花岗岩具明显的稀土元素“四分组”效应,是分异岩浆与流体作用的结果,可能经历一定程度的地壳混染,非真正意义上的S型花岗岩,属于造山后岩浆热事件,应代表造山的结束。格尔图白云母正长花岗岩及白云母二长花岗岩脉均受到热液流体作用,说明在中三叠世(224~238Ma),区内一直存在有大量的热液流体活动,且热液流体可能富含F和Cl,区内产出的大规模的萤石矿是否为该期流体活动的产物尚需进一步工作。

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