大湖塘钨矿区岩浆岩黑云母的成分特征及其成矿指示意义
Received:May 20, 2018  Revised:October 10, 2018  点此下载全文
引用本文:JIANG Hua,ZHANG DaYu,ZHOU TaoFa,CHEN XueFeng,YE LongXiang,YU ZhenDong,XIANG XinKui.2018.Geochemical characteristics of biotite from igneous rocks in Dahutang tungsten ore district and its implications[J].Mineral Deposits,37(6):1147~1167
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Author NameAffiliationE-mail
JIANG Hua School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei 230009, Anhui, China 
 
ZHANG DaYu School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei 230009, Anhui, China 
dayuzhang@hfut.edu.cn 
ZHOU TaoFa School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei 230009, Anhui, China 
 
CHEN XueFeng School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei 230009, Anhui, China 
 
YE LongXiang School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
Anhui Province Engineering Research Center for Mineral Resources and Mine Environments, Hefei 230009, Anhui, China 
 
YU ZhenDong No.916 Geological Party, Jiangxi Bureau of Geology & Mineral Exploration, Jiujiang 332100, Jiangxi, China  
XIANG XinKui No.916 Geological Party, Jiangxi Bureau of Geology & Mineral Exploration, Jiujiang 332100, Jiangxi, China  
基金项目:科技部深地资源勘查开采专项(编号:2016YFC0600206)、国家自然科学基金项目(41302050、41341390441)和中央高校基本科研业务费专项(编号:JZ2016HGTB0730)联合资助
中文摘要:大湖塘钨矿床是赣北地区近年来发现的超大型钨-多金属矿床,矿区内岩浆岩十分发育,且均含黑云母。按照黑云母的产出特征,大湖塘矿区岩浆黑云母可分为晋宁期花岗闪长岩中黑云母(类型一)、燕山期似斑状花岗岩中黑云母(类型二)、燕山期细粒花岗岩中黑云母(类型三)3种类型。对3类黑云母的电子探针和LA-ICPMS分析结果显示,3类黑云母属于铁云母到铁叶云母,富F贫Cl,富集大离子亲石元素Rb、Ba、K和高场强元素Ta、Nb、Ti等。综合对比显示,与钨成矿相关的燕山期似斑状花岗岩中的黑云母(类型二)具有较低的XMg值和Fe3+/Fe2+值、较高的Cl含量、∑REE浓度和LREE/HREE值,可作为含钨岩浆岩的成矿专属性指标。
中文关键词:地球化学  黑云母  LA-ICP-MS矿物原位分析  EMPA  大湖塘钨矿  江南古陆
 
Geochemical characteristics of biotite from igneous rocks in Dahutang tungsten ore district and its implications
Abstract:The Dahutang tungsten deposit is a superlarge tungsten-polymetallic deposit recently discovered in northern Jiangxi Province. There are widely developed multi-type granitoid intrusions, which are consistently rich in biotite. On the basis of their geological occurrences, the biotites in the Dahutang mining area can be divided into three types:biotite in the Jingingian granodiorite (type 1), biotite in the Yanshanian porphyritic granite (type 2) and biotite in the Yanshanian fine-grained granite (type 3). Electron microprobe and LA-ICP-MS analyses on three types of biotite show that they have high F but low Cl concentrations, and belong to annite and siderophyllite. They are enriched in Rb, Ba, K and depleted in Ta, Nb, Ti. Based on comparative study, the authors detect that biotite (type 2) from the Yanshanian porphyritic granite (W-mineralized) has lower XMg and Fe3+/Fe2+ ratios, highest Cl and ∑REE concentrations and LREE/HREE ratios,which are probably efficient indicators of the W-bearing granitoids.
keywords:geochemistry  biotite  LA-ICPMS in-situ mineral analysis  EMPA  Dahutang tungsten deposit  Jiangnan terrane
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