大兴安岭北部塔源铅锌铜矿床成矿机制研究  

A study on genesis of the Tayuan Pb-Zn-Cu deposit in the northern Greater Xing’an Range,NE China

作　　者：李星 任涛[2] 黄建国[2] LI Xing;REN Tao;HUANG Jian-guo(China Copper Mineral Resources Co.,Ltd.,Kunming 650500,China;Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Metallurgy Resources Co.,Ltd.,Kunming 650000,China)

机构地区：[1]中铜矿产资源有限公司,昆明650500 [2]昆明理工大学国土资源工程学院,昆明650093 [3]云南冶金资源股份有限公司,昆明650000

出　　处：《矿物岩石地球化学通报》2024年第4期775-786,共12页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金资助项目(42163005)。

摘　　要：为探讨塔源铅锌铜矿床成物质来源和成矿机制,对矿床中与硫化物密切共生的石英开展了流体包裹体显微测温、激光拉曼光谱和H-O同位素、硫化物LA-MC-ICPMS原位硫同位素测试。结果显示,TypeⅠ包裹体均一温度为232~340°C,盐度为1.2%~16.0%NaCl_(eqv),TypeⅡ包裹体均一温度主要为355~418°C,盐度为2.6%~11.6%NaCl_(eqv);两类包裹体中气、液相成分主要为H2O,少数TypeⅡ包裹体气泡中含少量CO_(2);硫化物的δ^(34)S为+0.3%~+3.1‰;石英的δ^(18)O和δD分别为+5.4‰~+10.5‰和为–97‰~–102‰。综合研究区地质和地球化学特征,本文认为塔源矿床与燕山期侵入岩有成因联系,富含金属元素的岩浆热液沿北东-北北东向和东西向顺层断裂运移,与围岩发生广泛的交代蚀变作用,与大气降水混合引起流体物理化学条件改变,导致硫化物沉淀。The Tayuan Pb-Zn-Cu deposit is located in the northern section of the Great Xing’an Range.In order to explore the oreforming material sources and mineralization mechanism of the deposit,microthermometry and laser Raman spectroscopy of fluid inclusions hosted in the quartz which is closely associated with sulfides in the deposit,H-O isotopic composition analyses of the quartzs,and in-situ sulfur isotope analyses of sulfides by using the LA-MC-ICPMS have been conducted.The results show that Type I fluid inclusions have homogenization temperatures ranging from 232°C to 340°C and salinities ranging from 1.2%to 16.0% NaCl_(eqv).Type II fluid inclusions have homogenization temperatures varying from 355°C to 418°C,and salinities varying from 2.6% to 11.6% NaCl_(eqv).The laser Raman spectroscopy results show that the gas and liquid components in those two types of fluid inclusions are mainly H2O,with the bubble of some Type II inclusions containing a small amount of CO_(2).The δ^(34)S values of sulfides vary from+0.3‰to+3.1‰.The δ^(18)O 和 δD values of quartzs vary from+5.4‰ to+10.5‰ and from-97‰ to-102‰,respectively.Combined with the comprehensive study of geological and geochemical characteristics of the area,it is suggested that the Tayuan deposit is genetically related to the Yanshanian intrusive rocks.The metal-rich magmatic hydrothermal fluid,which was exsolved from the magma of Yanshanian intrusive rocks,migrated along the NE-NEE-and EW-trending bedded faults,had extensive metasomatic alteration with wallrocks, and mixed with meteoric water. These caused changes of physical and chemicalconditions of the hydrothermal fluid, resulting in the precipitation of sulfides.

关 键 词：S-H-O同位素 流体包裹体 成矿机制 塔源 大兴安岭 

分 类 号：P618.4[天文地球—矿床学]