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广东乳源一六钨矿两期热液成矿事件:来自岩石地球化学的证据
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  • 英文篇名:Two hydrothermal mineralization events of Yiliu tungsten deposit in Ruyuan, Guangdong: Evidence from rock geochemistry
  • 作者:和秋姣 ; 赖健清 ; 肖文舟 ; 梅嘉靖 ; 钱丽华 ; 刘烨 ; 杜日俊
  • 英文作者:HE Qiu-jiao;LAI Jian-qing;XIAO Wen-zhou;MEI Jia-jing;QIAN Li-hua;LIU Ye;DU Ri-jun;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Ministry of Education,Central South University;School of Geosciences and Info-Physics,Central South University;
  • 关键词:一六钨矿床 ; S型花岗岩 ; 结晶分异 ; 两期成矿
  • 英文关键词:Yiliu tungsten deposit;;S-type granite;;fractional crystallization;;two metallogenic stages
  • 中文刊名:ZYXZ
  • 英文刊名:The Chinese Journal of Nonferrous Metals
  • 机构:中南大学有色金属成矿预测与地质环境监测教育部重点实验室;中南大学地球科学与信息物理学院;
  • 出版日期:2018-12-15
  • 出版单位:中国有色金属学报
  • 年:2018
  • 期:v.28;No.237
  • 基金:中南大学创新驱动项目(2015CX008);中南大学中央高校基本科研业务专项资金资助(2017zzts566);; 中国地质调查局“整装勘查关键基础地质研究”计划项目(12120114052701)~~
  • 语种:中文;
  • 页:ZYXZ201812024
  • 页数:13
  • CN:12
  • ISSN:43-1238/TG
  • 分类号:224-236
摘要
一六矿床是粤北钨锡多金属矿床中一个重要的钨矿床。矿区内出露的宝山、一六两期岩体的岩性均为二长花岗岩,具有高硅、过铝质、富钾和钙碱性等相似特征,为分异的S型花岗岩。两期岩体源区相同,继承了陆内造山向板内伸展环境过渡的沉积物质,经历了岩石圈沉积岩和早期火成岩的部分熔融,并通过岩浆结晶分异作用使W、Sn等成矿元素富集。将矿床内的矽卡岩分为两组:第一组Rb、Sr、Ba等大离子亲石元素亏损程度低,稀土元素总量(∑REE)高,具有显著的Eu负异常;第二组Rb、Sr、Ba等元素亏损程度高,∑REE值较低,具有弱Eu异常。两组矽卡岩是矿区内两期热液活动作用的产物,宝山岩体与帽子峰组砂岩发生接触交代作用形成矽卡岩型白钨矿,一六岩体出溶热液沿矽卡岩中的裂隙充填交代形成石英脉型白钨矿,这两期热液成矿事件反映了一六钨矿复合型矿床的本质。
        Yiliu deposit is an important tungsten deposit of W-Sn polymetallic deposits in Northern Guangdong.The lithology of Baoshan and Yiliu intrusion exposed in the mineral area are both adamellite.Two stages of intrusions which have similar geochemical characteristics:high-SiO_2,peraluminous,K-rich and calc-alkaline,belong to differentiated S-type granite.These intrusions have the same source region which inherits the sediment transition from the intran-continent orogeny environment to intraplate extensional environment,experiences the partial melting of sedimentary rocks and early stage igneous rocks,and enriches the ore-forming elements,such as W and Sn,mainly through the fractional crystallization of magma.The skarn is divided into two groups.The first group of skarn is slightly depleted in large ion lithophile elements,such as Rb,Sr,Ba,and has the high total REE content,with significant negative Eu anomaly.The second group of skarn is highly depleted in large ion lithophile elements and has the lower total REE content,with slightly Eu anomaly.It is believed that the two groups of skarn in the mineral area are the product of the two hydrothermal activities.The skarn type scheelite was formed by contact metasomatism between Baoshan intrusion and sandstone of Maozifeng Formation.Yiliu intrusion's dissolution hydrothermal filling and metasomatism occurring along the cracks of skarn formed quartz vein type scheelite.The two stages of hydrothermal mineralization events reflect the nature that Yiliu tungsten deposit is a composite deposit.
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