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地质学报  2007 

甘肃马衔山花岗岩杂岩体LA-ICPMS锆石U-Pb测年及其构造意义

, PP. 72-78

Keywords: 马衔山,花岗岩杂岩体,LA-ICPMS,U-Pb同位素,Rodinia超大陆,格林威尔造山运动

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Abstract:

甘肃马衔山侵入杂岩体位于祁连造山带的东部,侵入于新太古代―古元古代变质基底岩系(马衔山岩群)中,主体岩石类型为片麻状二长花岗岩,其次为侵入于片麻状二长花岗岩中的钾长花岗岩。利用LA-ICPMS(激光剥蚀等离子体质谱)测年设备,对片麻状二长花岗岩进行单颗粒锆石微区U-Pb同位素测定,获得1192±38Ma的年龄,为中元古代晚期;岩石地球化学特征显示二长花岗岩侵入体具有火山弧-同碰撞花岗岩特征。马衔山变形侵入体所代表的热―构造事件与格林威尔造山运动时代(1190~980Ma)相当,可能与Rodinia超大陆形成有一定的成因联系。这一新的资料,对研究祁连造山带元古宙大地构造格局、构造演化及中国大陆动力学具有重要意义。

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