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Gold Science and Technology >

2022 , Vol. 30 >Issue 6: 835 - 847

DOI: https://doi.org/10.11872/j.issn.1005-2518.2022.05.186

Mineral Exploration and Resource Evaluation

Genesis of Carbonaceous Material in the Wangu Gold Deposit and Its Relationship with Gold Mineralization

  • Shengwei ZHANG , 1, 2 ,
  • Teng DENG , 1, 2 ,
  • Deru XU , 1, 2, 3 ,
  • Yueqiang ZHOU 4 ,
  • Guojun DONG 4 ,
  • Zenghua LI 1, 2 ,
  • Wen MA 1, 2 ,
  • Ke XU 1, 2 ,
  • Yan HAI 1, 2
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  • 1. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China
  • 2. School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China
  • 3. Jiangxi Engineering Laboratory on Radioactive Geoscience and Big Data Technology, East China University of Technology, Nanchang 330013, Jiangxi, China
  • 4. No. 402 Geological Party, Bureau of Geology and Mineral Resources Exploration and Development of Hunan Province, Changsha 410014, Hunan, China

Received date: 2021-11-30

  Revised date: 2022-03-02

  Online published: 2023-01-06

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Highlights

The Wangu gold deposit，located in the central Jiangnan orogenic belt，is one of the most repre-sentative gold deposits.The orebodies are mainly hosted in the Neoproterozoic Lengjiaxi Group.Large amounts of carbonaceous material（CM） occurs in the host rocks and ores.However，the types and genesis of CM in the deposit and its relationship with gold mineralization are still unclear，which restricts the understanding of the precipitation mechanism of mineralization elements and the deep prospecting and exploration work. Systematic petrographic and laser Raman spectroscopic analyses of CM in surrounding rocks and ores show that there are three types of CM in the deposit，namely CM1，CM2 and CM3.Among them，CM1（T=507~613 ℃） is granular with small particles，which are distributed in quartz and micamineral particles or pores，in disseminated distribution，smooth edges and corners and good roundness，which may be the source of debris.CM2（T=390~470 ℃） is layered and distributed around minerals such aspyrite and arsenopyrite or in pyrite.CM3（T=240~355 ℃） coexists with hydrothermal minerals such as siderite，quartz and pyrite，and the formation temperature is close to the metallogenic temperature，surrounded by a large amount of pyrite，which is mainly produced in vein form.Consequently，CM1 and CM2 may have been formed by pre-ore metamorphism，which is of metamorphic origin，while CM3 may be the product of hydrothermal process，which is of hydrothermal origin.Sulfide LA-ICP-MS Mapping and trace element analyses show that the Au-As coupling phenomenon of sulfide in CM2 is wonderful.The pyrite rim is more enriched in Au，As，Co and Ni than the core，and poor in Bi，Pb，and Sb.In the vicinity of pores in the core of pyrite，most of them have abnormally high Au.The location of abnormally high Au，As，Co，and Ni is very similar，forming a growth ring of pyrite.The pyrite grains associated with both CM2 and CM3 contain gold，but those related to CM2 are richer in Au and As，and poor in trace elements such as Cu，Co，Ni，Bi，Pb.The sulfide of CM2 have no Te，however，the content of CM3 are less.Combining with previous studies，pre-ore layer CM2 can react with Au-bearing fluid as efficient reductant to prompt Au precipitation.However，hydrothermal CM3 together with pyrite precipitating from ore-bearing fluid，was also favorable to gold mineralization.

Cite this article

Shengwei ZHANG , Teng DENG , Deru XU , Yueqiang ZHOU , Guojun DONG , Zenghua LI , Wen MA , Ke XU , Yan HAI . Genesis of Carbonaceous Material in the Wangu Gold Deposit and Its Relationship with Gold Mineralization[J]. Gold Science and Technology, 2022 , 30(6) : 835 -847 . DOI: 10.11872/j.issn.1005-2518.2022.05.186

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http://www.goldsci.ac.cn/article/2022/1005-2518/1005-2518-2022-30-6-835.shtml

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