【摘要】 内蒙古东南部古生代造山带在石炭纪时期的构造环境和构造演化,至今在认识上存在较大的分歧。锡林郭勒杂岩是该带内出露面积较大的前石炭纪强变形地质体,在这套杂岩两侧大面积分布石炭二叠纪海相碎屑岩-碳酸盐岩建造,杂岩中及其两侧发现了大量的中酸性侵入岩体或岩墙与其紧密伴生。侵入岩岩性主要为石英闪长岩和英云闪长岩。对其中的石英闪长岩进行了岩相分析和SHRIMP锆石UPb年代学测定,所得年龄为(313±5~323±4)Ma,属于晚石炭世侵入体。结合区域地质演化特征分析,其应形成于张性构造环境。更多还原

【Abstract】 There are great bifurcations as yet on the structural environment and on the evolution of the Xingmeng Paleozoic orogenic belt in Southeast Inner Mongolia during the Carboniferous Period.Large number of intermediate-acidic intrusions or dykes were found in the Xilin Gol complex and its margin.The intrusive rocks trend NE-NEE,are closely related to the Xinlin Gol complex in space and are mainly quartz-diorite and quartz-biotite-diorite.Quartz-diorite was selected and tested to be(313±5) Ma to(323±4) Ma,falling into the range of later Carboniferous Period.This age affirmance is of great significance for studying the geological evolvement in Carboniferous-Permian period in Xingmeng Paleozoic orogenic belt.更多还原