江南钨矿带高家塝钨多金属矿床矿化分带特征及其指示意义  

Metallogenic zonation of Gaojiabang tungsten polymetallic deposit in Jiangnan tungsten ore belt and its significance

作　　者：任康达 张达玉[1] 叶龙翔 孟翔 易洪 黄家龙 万书文 周涛发[1] REN KangDa;ZHANG DaYu;YE LongXiang;MENG Xiang;YI Hong;HUANG JiaLong;WAN ShuWen;ZHOU TaoFa(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,Anhui,China;No.812 Geological Party,East China Metallurgical Geological Survey Bureau,Tongling 244008,Anhui,China;Institute of Geological Exploration,East China Metallurgical Geological Survey Bureau,Hefei 230088,Anhui,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]华东冶金地质勘查局812地质队,安徽铜陵244008 [3]华东冶金地质勘查研究院,安徽合肥230088

出　　处：《矿床地质》2021年第2期369-383,共15页Mineral Deposits

基　　金：国家自然科学基金项目(编号:41972076、91962218);科技部深地资源勘查开采专项(编号:2016YFC0600206);安徽省自然资源科技项目(编号:2020-K-11)联合资助。

摘　　要：高家塝钨多金属矿床位于江南钨矿带北部。钨矿化发育在花岗闪长斑岩与黄柏岭组接触的矽卡岩及其两侧。从岩体向外将矿石划分为:花岗闪长斑岩中细脉浸染状白钨矿矿石(类型Ⅰ)、矽卡岩中浸染状白钨矿矿石(类型Ⅱ)、角岩中脉状白钨矿矿石(类型Ⅲ)3类。高家塝矿床不同类型矿石的白钨矿和磁黄铁矿电子探针(EPMA)分析结果显示,白钨矿w(Mo)从类型Ⅱ(w(Mo)=1.34%~1.40%)→类型Ⅲ(w(Mo)=0.01%~0.17%)→类型Ⅰ(w(Mo)<0.01%)降低。从类型Ⅰ→类型Ⅱ→类型Ⅲ,磁黄铁矿中Cu、Fe元素含量降低;Zn、Co、Ni含量增高。高家塝钨矿床形成白钨矿的成矿流体从类型Ⅱ→类型Ⅲ→类型Ⅰ,氧逸度降低;形成磁黄铁矿的早期石英-硫化物阶段,类型Ⅱ的成矿流体降温速率缓慢,类型Ⅰ和Ⅲ的成矿流体发生快速冷凝作用。区域对比研究显示,高家塝矿床为贫钼白钨矿矿床,形成于还原环境。The Gaojiabang tungsten polymetallic deposit is located in the northern sector of the Jiangnan tungsten ore belt.Tungsten mineralization occurs in the skarn and its adjacent parts between granodiorite porphyry and Huangbailing Formation.According to the spatial location and modes of occurrence,the ores can be subdivided into three types:scheelite in porphyry(typeⅠ),scheelite in skarn(typeⅡ)and scheelite in hornblende(typeⅢ).The EPMA analysis results show that Mo content in the scheelite grains decreases from typeⅡore(w(Mo)=1.34%~1.40%)through typeⅢore(w(Mo)=0.01%~0.17%)to typeⅠore(w(Mo)<0.01%).The values of Cu and Fe in pyrrhotite grains gradually decrease,while the values of Zn,Co and Ni gradually increase from typeⅠore through typeⅡore to typeⅢore.This metallogenic zonation indicates that,in the Gaojiabang tungsten polymetallic deposit,the oxygen fugacity of ore-forming fluid in skarn-stage gradually decreased from typeⅡore through typeⅠore to typeⅢore,and in quartz sulfide stage,the cooling rate of ore-forming fluid that formed typeⅡore was much higher than that of typeⅠand typeⅢores.A comparison with regional tungsten polymetallic deposits shows that the Gaojiabang deposit is a Mo-poor scheelite deposit,which was formed in a relatively reduced metallogenic system.

关 键 词：地球化学 白钨矿 磁黄铁矿 EPMA 成矿指示 江南钨矿带 

分 类 号：P618.67[天文地球—矿床学]