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Gold Science and Technology >

2020 , Vol. 28 >Issue 4: 479 - 496

DOI: https://doi.org/10.11872/j.issn.1005-2518.2020.04.050

Mineral Exploration and Resource Evaluation

Genetic Types and Prospecting Significance of Liumei Gold Deposit，Guigang，Guangxi Province，China

  • Gang CHEN , 1 ,
  • Maohong CHEN , 1 ,
  • Kezhong MA 1 ,
  • Rui GE 2 ,
  • Shenxiang GUO 2 ,
  • Qiqiang WU 3 ,
  • Qisheng YUAN 4
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  • 1. NLR Key Laboratory of Metallogeny and Mineral Assessment，Institute of Mineral Resources，Chinese Academy Geological Sciences，Beijing 100037，China
  • 2. School of Earth Science and Mineral Resources，China University of Geosciences(Beijing)，Beijing 100083，China
  • 3. No. 6 Geological Team of Guangxi，Guigang 537100，Guangxi, China
  • 4. No. 273 Geological Team of Guangxi，Guigang 537100，Guangxi, China

Received date: 2020-03-03

  Revised date: 2020-04-18

  Online published: 2020-08-27

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Highlights

Liumei gold deposit is located in the northeast of Dapingtianshan stock，Guigang，Guangxi Province.According to mineral composition and pulse cutting relation,the deposit hydrothermal activity process is divided into four stages:（1）quartz-pyrite stage；（2）pyrite arsenopyrite-quartz stage；（3）galena-sphalerite-chalcopyrite-tennantite-ankerite-quartz stage；（4）quartz-ankerite stage.The second stage as the main metal-logenic stage.The main gold carriers are arsenopyrite and pyrite. EPMA analysis shows that Au mainly exists in the form of “invisible” submicroscopic-supermicroscopic inclusion gold.Fluid inclusion test shows that the inclusions in quartz or calcite are mainly gas-liquid two-phase，the average temperature in the main metallogenic stage is about 181 ℃，the average salinity [w（NaCl）] is 9.36%，and the density is 0.946 g/cm3, indicating that the ore-forming fluid is low-temperature,low-salinity,low-density fluid.The hydrogen and oxygen isotopic composition (δD value between -73‰~-57‰， δ 18 O H 2 O value between 2.3‰~6.1‰) indicates that the ore-forming fluid may be related to the magmatic hydrothermal fluid and was mixed by meteoric precipitation in the later period.The value of the gold-bearing δ 34S is between -0.8‰ and 0.5‰，indicating that the ore-forming material comes from magmatic rock.These features indicate that Liumei gold deposit is very different from typical carlin-type gold deposits，especially it is lack of characteristic of the low temperature carlin-type gold mineral combination (orpiment-realgar-cinnabar)，but instead contain more base metals mineral galena-sphalerite-chalcopyrite)，so it is closer to related to magmatic activities of distal low temperature hydrothermal deposit.Based on the spatial distribution characteristics of regional ore deposits and rock masses，the metallogenic model of Dapingtianshan magmatic hydrothermal system for porphyry gold and copper deposits (Longtoushan gold deposit)，skarn-type silver lead and zinc deposits (Touzha Ag-Pb-Zn deposit) and distal low temperature hydrothermal gold deposits (Liumei gold deposit) is proposed.The model implies that there should be intermediate temperate hydrothermal vein and skarn type silver-lead-zinc deposits deep in Liumei gold deposit and in the direction of Dapingtianshan rock mass.The model of magmatic hydrothermal metallogenic system established in this paper has important guiding significance for similar ore deposits in Dayaoshan area.

Cite this article

Gang CHEN , Maohong CHEN , Kezhong MA , Rui GE , Shenxiang GUO , Qiqiang WU , Qisheng YUAN . Genetic Types and Prospecting Significance of Liumei Gold Deposit，Guigang，Guangxi Province，China[J]. Gold Science and Technology, 2020 , 28(4) : 479 -496 . DOI: 10.11872/j.issn.1005-2518.2020.04.050

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http://www.goldsci.ac.cn/article/2020/1005-2518/1005-2518-2020-28-4-479.shtml

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