高龙金矿同位素地球化学特征及其地质意义

THE ISOTOPE EARTH CHEMICAL FEATURE OF THE GAOLONG GOLD DEPOSIT AND ITS GEOLOGY SIGNIFICANCE

高龙金矿是桂西北地区一典型的超微细粒浸染型金矿,本文对其硫、氢、氧、铅同位素进行了系统研究,分析总结了同位素组成特征、演化规律,并结合野外地质研究,推知高龙金矿成矿物质来源于围岩地层,成矿热液由雨水下渗形成的深循环地下水和岩浆水组成,矿床形成于开放环境,且越到后期开放程度越大,成矿时代大约为中生代,矿床成因为雨水下渗并淋滤围岩地层中的金形成深循环的地下含金溶液,与岩浆热液汇合,沿高龙隆起边缘环状断裂上侵,并在断裂中及围岩孔隙、裂隙中沉淀聚集、富积成矿。从而确定了同位素地球化学研究在高龙金矿成矿作用及矿床成因研究中的重要地位。

Gaolong gold deposit is a typical fine impregnation ?type gold deposit in Northwest Guangxi. In deposit district, there is a circle fracture zone around Ganlong upwarping,the ore body scattered in the circle fracture and around the wall rock. The ore rock is Trias arenaceous-argiuite stone and no clear boundary line between the ore rock and the surrounding rock. Although there is no magmatic rock emergence in the ore district, but there is a remote sension demonstration of pluton.Based on the geology characters, this paper systematic study S、H、O、Pb isotope of Gaolong gold deposit. The study results show that;The ore forming element came from the surrounding rock and minerogenetic hydrother-mal; the metallogenetic hydrothermal was constitute of Mesozoic rain wate and magmatic hydrothermal; the metallogenetic epoch was Mesozoic era and the metallogenetic enviroment was open and the later the opener.According to the geology characters and the isotope geochemical feature, this paper give the gold metallogenesis of Gaolong gold deposit, i. e. the rain water infiltrated through the aurauric-argentiferous strata and melted the gold element and so on, and mixed the magmatic hydrothermal. By the pressure of rock and thermal convertion, metallogenetic hy-drothermel was traveled along the circle fracture, and deposited in the circle fracture and the pore and crack of the wall rock, formed the Gaolong gold deposit.