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Muscovite 40Ar−39Ar age and its geological significance in Zhuxi W(Cu) deposit, northeastern Jiangxi

赣东北朱溪钨(铜)矿床白云母40Ar−39Ar 定年及其地质意义

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Abstract

The Zhuxi W(Cu) skarn deposit, the world’s largest tungsten deposit is newly discovered in Jingdezhen city, northeastern Jiangxi province, China. It mainly occurs near the contact zone between the Yanshanian granites and the Late Paleozoic carbonate rocks. Three types of mineralization including skarn type, altered granite type and quartz vein-veinlet type orebodies have been observed. In this study, the 40Ar−39Ar age of hydrothermal muscovite coexisting with copper mineralization in the altered granite type orebody formed near the unconformity interface is determined by step-heating technology using CO2 laser. The plateau age, isochron age, and inverse isochron age of muscovite are (147.39±0.94) Ma, (147.2±1.5) Ma, and (147.1±1.5) Ma, respectively. These ages are almost identical to the ages of ore-related granite and other mineralization types in the Zhuxi W(Cu) deposit, indicating that the Cu mineralizations occurred at the shallow depth and near the unconformity interface are contemporaneous during the Late Jurassic. This further suggested that the acompanied W and Cu mineralization in the Zhuxi W(Cu) deposit which may be controlled by the magma source is enriched in both W and Cu.

摘要

景德镇朱溪钨铜多金属矿床是近年在赣东北地区新发现的世界最大钨矿床,该矿床主要产于燕 山期酸性岩体与晚古生代碳酸盐岩接触带附近,发育有矽卡岩型、蚀变花岗岩型和石英细脉–网脉型 矿体。本文利用激光阶段加热技术对不整合接触界面附近蚀变花岗岩型矿体中与铜关系密切的蚀变矿 物白云母进行40Ar−39Ar 年龄测定,获得矿床成矿年,白云母坪年龄为(147.39±0.94) Ma、等时线年龄 为(147.2±1.5) Ma、反等时线年龄为(147.1±1.5) Ma,这与前人用其他方法测定的花岗岩成岩和成矿年 龄近乎一致,表明浅部或不整合接触界面附近的铜矿均形成于晚侏罗世,同时进一步表明朱溪钨(铜) 矿床的形成可能受富含钨铜的岩浆岩控制。

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Correspondence to Xiao-fei Pan 潘小菲.

Additional information

Foundation item: Project(41873059) supported by the National Natural Science Foundation of China; Project(JGMEDB [2017]78) supported by the Jiangxi Geological and Mineral Exploration and Development Bureau Foundation, China; Project(2011BAB04B02) supported by the National Science and Technology Support Plan Project, China; Project(201411035) supported by the Welfare Research Program of Ministry of Land and Resources, China; Project(20150013) supported by Jiangxi Provincial Geological Exploration Fund Management Center, China

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Ouyang, Y., Wei, J., Lu, Y. et al. Muscovite 40Ar−39Ar age and its geological significance in Zhuxi W(Cu) deposit, northeastern Jiangxi. J. Cent. South Univ. 26, 3488–3501 (2019) doi:10.1007/s11771-019-4268-3

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Key words

  • Muscovite
  • 40Ar−39Ar age
  • altered granite-type orebody
  • Zhuxi W(Cu) deposit
  • northeastern Jiangxi

关键词

  • 白云母
  • 40Ar−39Ar 年龄
  • 蚀变花岗岩型矿体
  • 朱溪钨(铜)矿床
  • 赣东北