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地球学报  2010 

鄂尔多斯盆地西缘汝箕沟大岭-鼓鼓台玄武岩锆石U-Pb定年及其构造意义

DOI: 10.3975/cagsb.2010.02.13

Keywords: 鄂尔多斯盆地西缘,大岭-鼓鼓台玄武岩,锆石U-Pb定年,微量元素,构造意义

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Abstract:

利用显微镜、地球化学、ELA-ICPMS定年等技术,对鄂尔多斯盆地西缘汝箕沟大岭-鼓鼓台玄武岩及其样品中的锆石进行了内部结构、元素组成分析和原位定年。汝箕沟大岭-鼓鼓台玄武岩为典型的大陆拉斑玄武岩,所获得的锆石年龄分别为1966±15Ma、344±22Ma和241±7Ma,其中1966±15Ma为继承锆石年龄,344±22Ma为岩浆第一次分离结晶年龄,而241±7Ma代表了玄武质岩浆最后喷出时的锆石结晶年龄。可见,中晚三叠世盆地西缘北部贺兰山地区处于区域挤压背景下的局部伸展环境,可能为一小型裂谷盆地。

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