北京西山中生代髫髻山组大台某金属矿区Ar-Ar年代学研究

Study on Ar-Ar Chronology of Volcanic Rock in a Mining Area of Datai Formation in the Mesozoic

本文采用Ar-Ar同位素年代学的测年方法对北京地区北部和西部髫髻山组火山岩矿区中的五个岩石的斜长石和钾长石样品进行测年。根据测年结果分析,将髫髻山火山作用阶段划归为:130-150 Ma,主要发生在晚侏罗-白垩世。

In this paper, five plagioclase and potassium feldspar samples from volcanic rocks in the northern and western parts of the Beijing area were measured by Ar-Ar isotopic chronology dating. According to the analysis of dating results, the stage of volcanic action of the jiaoji mountain is classified as： 130-150 Ma, mainly in the Late Jurassic - Cretaceous.