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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。
Based on the U-Pb dating of zircon U-Pb isotope dating from the Aondululu granite in Hulunbeier Geological Park, Inner Mongolia, and the main geochemical characteristics of the rock samples, and combining with the field geological survey results, the comprehensive analysis shows that the zircon U-Pb The age is 158.0 ± 2.7Ma, which is the product of Late Jurassic magmatism. The rocks are rich in silicon, high-K calc-alkaline and perlite, enriching for Rb, Th, K, etc., Field strength elements Ta, Nb, Zr and so on. According to the regional geological research results, it is initially determined that the Aondurongzhengchang granite is the product of the local melting of the crustal thickening due to the extension of the Late Jurassic Mongolia-Okhotsk Ocean.