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湖南省东北部地区桃江县木瓜园钨多金属矿成岩成矿时代及其对区域成矿作用的启示
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  • 英文篇名:Diagenetic and Metallogenic Age of the Muguayuan Tungsten Polymetallic Deposit and Its Effect on Regional Mineralization,Taojiang County,Northeastern Hunan Province,China
  • 作者:陕亮 ; 庞迎春 ; 柯贤忠 ; 刘家军 ; 陈文辉 ; 牛志军 ; 徐德明 ; 龙文国 ; 王滨清
  • 英文作者:Shan Liang;Pang Yingchun;Ke Xianzhong;Liu Jiajun;Chen Wenhui;Niu Zhijun;Xu Deming;Long Wenguo;Wang Binqing;Faculty of Earth Science and Resources,China University of Geosciences(Beijing);Wuhan Geological Survey Center,China Geological Survey;Research Center of Granitic Diagenesis and Mineralization,China Geological Survey;No.418Geological Brigade of Geology and Mineral Exploration Bureau in Hunan Province;
  • 关键词:木瓜园钨矿 ; 北东向钨矿带 ; 燕山期 ; 印支期 ; 湘东北
  • 英文关键词:Muguayuan tungsten deposit;;NE tungsten belt;;Yanshanian;;Indosinian;;northeastern Hunan Province
  • 中文刊名:DZKQ
  • 英文刊名:Geological Science and Technology Information
  • 机构:中国地质大学(北京)地球科学与资源学院;中国地质调查局武汉地质调查中心;中国地质调查局花岗岩成岩成矿地质研究中心;湖南省地质矿产勘查开发局418队;
  • 出版日期:2019-01-15
  • 出版单位:地质科技情报
  • 年:2019
  • 期:v.38;No.184
  • 基金:中国地质调查局地质矿产调查评价专项(DD20160031)
  • 语种:中文;
  • 页:DZKQ201901011
  • 页数:13
  • CN:01
  • ISSN:42-1240/P
  • 分类号:106-118
摘要
江南造山带的湘东北-赣西北-皖东南—浙西南地区存在一个北东向钨矿带,成因类型以斑岩型、矽卡岩型为主,近年在其西南方向新发现了木瓜园大型钨矿床,成矿过程与斑岩体密切相关。厘定了木瓜园矿区含矿花岗斑岩的锆石LA-ICP-MS U-Pb年龄(224.2±2.0)Ma(MSWD=0.65,n=17),辉钼矿Re-Os同位素等时线年龄(225.4±1.4)Ma(MSWD=0.71)及加权平均年龄(222.96±0.96)Ma(MSWD=1.08,n=5),表明矿区成岩与成矿时代均为晚三叠世,属于印支期;锆石初始176 Hf/177 Hf比值0.282 444~0.282 580,εHf(t)值为-1.9~-7.2,二阶段模式年龄(TDM2)为1 713~1 388Ma,表明含矿岩体岩浆源区主要为古元古代-中元古代古老地壳岩石,起源于下地壳古老物质的重熔。由于北东向钨矿带成岩成矿集中于燕山期,木瓜园成岩成矿集中于印支期,结合区域地质背景,推测该钨矿带西南方向不超过湘东北地区新宁-灰汤断裂,但湖南省东北部地区存在一次晚三叠世大规模成岩与局部钨钼多金属成矿过程,且具有较大的找矿潜力。
        There is a NE Yanshanian tungsten ore belt,from northeastern Hunan Province to northwestern Jiangxi Province,southeastern Anhui Province,and southwestern Zhejiang Province,in the Jiangnan orogenic belt.The Muguayuan large porphyry tungsten deposit has been found in southwestern Jiangnan oro-genic belt in recent years,whose metallogenic process is closely related to porphyry magma.The paper determines the U-Pb age(224.2±2.0)Ma(MSWD=0.65,n=17)of the zircons from granite porphyry by LA-ICP-MS,the Re-Os isotope isochron age(225.4±1.4)Ma(MSWD=0.71)and the weighted average age(222.96±0.96)Ma(MSWD=1.08,n=5)of molybdenite.All of these show that the diagenetic age and the metallogenic age are the Late Triassic in Indosinian.The zircon initial 176 Hf/177 Hf ratio of0.282 444-0.282 580,εHf(t)value is from-1.9to-7.2,and two-phase model age(TDM2)of 1 713-1 388 Ma,indicate that the source area of Sanxianba granite porphyry is mainly in the PaleoproterozoicProterozoic crustal rocks,originated from the lower crust remelting of the old material.It is speculated that the southwest of tungsten ore zone extends and stops at the Xiangning-Huitang fracture area in northeastern Hunan,as the diagenetic age and metallogenic age both are Yanshanian not Indosinian of the NE tungsten ore zone.It is also believed that there is aprocess of large scale diagenesis and tungsten molybdenum metallogenic in some areas,showing greater prospecting potential.
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