安徽庐枞盆地虎栈铜矿床成矿流体特征研究  

The characteristics of ore-forming fluids of the Huzhan copper deposit in the Luzong Basin, Anhui Province

作　　者：张舒[1] 张赞赞[1] 郑光文[1] ZHANG Shu;ZHANG Zan-zan;ZHENG Guang-wen(Geological Survey of Anhui Province(Institute of Geological Sciences of Anhui Province),Hefei,Anhui 230001,China)

机构地区：[1]安徽省地质调查院(安徽省地质科学研究所),安徽合肥230001

出　　处：《安徽地质》2022年第1期19-22,共4页Geology of Anhui

基　　金：安徽省公益性地质调查项目“安徽省庐枞地区与碱性岩有关的铀(钍)矿调查评价”(编号:2016-g-1-7)及“安徽省稀有、稀散元素矿产远景调查”(编号:2016-g-2-16)联合资助。

摘　　要：虎栈铜矿床位于长江中下游成矿带庐枞中生代火山岩盆地中部,是区域脉状铜矿床的典型代表。铜矿体多呈近东西向脉状,受断裂控制产出于砖桥组火山岩及安山玢岩中。成矿过程可以划分为石英-硫化物和石英-方解石两个阶段。本次工作对主成矿阶段——石英-硫化物阶段的流体包裹体开展了研究工作,明确包裹体以气液两相包裹体为主,成矿温度为120~240℃,盐度为5.41~22.69(wt%)NaCl eq。虎栈铜矿主成矿阶段流体可能发生了沸腾,流体沸腾引发的流体不混溶可能导致了矿质沉淀。The Huzhan copper deposit is located in the Luzong Basin of the Middle-Lower Reaches of the Yangtze River Metallogenic Belt as a representative of the vein-type copper deposits in the region. The vein-like copper ore bodies are hosted in the volcanic rocks and andesitic porphyrite of the Zhuanqiao Formation, and controlled by EW-trending faults. The mineralization of the deposit can be divided into two stages, i.e., quartz-sulfide stage and quartz-calcite stage. The fluid inclusions of the quartz-sulfide stage are predominantly gas-liquid inclusions characterized by low to medium temperature(120~240℃)and low to high salinity(5.41~22.69wt% NaCl eq). During the main ore-forming stage, fluid boiling may have occurred and caused the fluid immiscibility, which is believed to have led to the mineral precipitation.

关 键 词：虎栈铜矿床 流体包裹体 脉状铜矿 庐枞盆地 

分 类 号：P611.1[天文地球—矿床学]