萤石Sm-Nd同位素体系对蒙古国巴音苏赫图矿床成矿时代的制约

Samarium-Neodymium isotope system of fluorites from the Bayinsukhtu deposit,Mongolia:constraints on the mineralizing age

本文论述了蒙古国东南部巴音苏赫图地区新发现萤石矿矿区地质、年代学特征,分析了萤石主要产于石英斑岩边部构造裂隙内,呈脉状、网脉状等形态产出。萤石样品Sm-Nd等时线年龄为158±23 Ma。萤石矿为岩浆期后热液与大气水混合形成的晚侏罗世矿床。该区侏罗纪成矿事件形成时代的鉴别和成因机制的研究,将为在南蒙古和中蒙边境地区寻找类似的矿床提供理论依据。

In this paper,we analyze the new finding of the fluorite ore district,and their characteristics of geology,geochronology and geochemistry.The fluorite exists inside the tectonic fissure on the edge of the quartz porphyry,occurring as the veins and net veins.The Nd-Sm isochron ages of the fluorite is 158±23 Ma,respectively.The fluorite is the deposit in late Jurassic formed by the post-magmatic hydrothermal fluid and meteoric water.The distinguishing and mechanism study of the mineralization event found in late Jurassic in that region provide a theoretical basis for finding mineral deposit of similar areas at the south Mongolia and the border between China and Mongolia.