内蒙古呼伦贝尔地质公园阿敦础鲁花岗岩锆石U-Pb年龄及其构造意义

发布时间：2018-03-16 22:31

本文选题：花岗岩　切入点：锆石U-Pb年龄　出处：《干旱区资源与环境》2017年05期 　论文类型：期刊论文

【摘要】：通过对内蒙古呼伦贝尔地质公园阿敦础鲁花岗岩进行的锆石U-Pb同位素年代测定和岩石样品主要地球化学特征分析,结合野外地质调查成果,综合分析表明,阿敦础鲁花岗岩锆石U-Pb年龄为158.0±2.7Ma,为晚侏罗世岩浆活动的产物;岩石具有富硅、高钾钙碱性和过铝质特征,富集大离子亲石元素Rb、Th、K等,轻微亏损高场强元素Ta、Nb、Zr等。结合区域地质研究成果,初步确定阿敦础鲁正长花岗岩是晚侏罗世蒙古-鄂霍茨克洋闭合造山后伸展作用下地壳挤压增厚局部熔融的产物。
[Abstract]:Based on the zircon U-Pb isotopic dating and the main geochemical characteristics of rock samples in Hulunbeir Geopark, Inner Mongolia, combined with the results of field geological survey, the comprehensive analysis shows that the zircon U-Pb isotopic dating and the main geochemical characteristics of the rock samples are analyzed. The zircon U-Pb age of the Aduchulu granite is 158.0 卤2.7 Ma, which is the product of late Jurassic magmatism, and the rocks are rich in silicon, high potassium, calc-alkaline and peraluminous, and enriched in the large ion lithophile element RbSh K, etc. Combined with the results of regional geological research, it is preliminarily determined that the Aduzhuzheng granite is the product of local melting of crustal compression and thickening due to the late Jurassic Mongolia-Okhotsk ocean closed orogenic extension.
【作者单位】：中国地质大学(北京)地球科学与资源学院;中国地质科学院;
【基金】：内蒙古自治区新巴虎右旗国土资源局专项基金项目(20130901)资助
【分类号】：P597.3;P588.121

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