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Gold Science and Technology >

2024 , Vol. 32 >Issue 2: 191 - 206

DOI: https://doi.org/10.11872/j.issn.1005-2518.2024.02.140

Mineral Exploration and Resource Evaluation

Geological and Geochemistry Characteristics and Genesis Analysis of Gold Deposits in Xihuashan Area，Haiyuan，Ningxia

  • Li SU , 1 ,
  • Haijun ZHU 1 ,
  • Shoujiang GU , 1 ,
  • Xingke YANG , 2 ,
  • Yichen ZHAO 2 ,
  • Xueping SUN 1 ,
  • Hujun HE 2 ,
  • Ke HAN 2 ,
  • Yuyu ZHANG 1 ,
  • Jiang TAN 1 ,
  • Yuanlong XIE 1 ,
  • Long ZHANG 1 ,
  • Libo GAO 1
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  • 1. Geological Archive of Ningxia Hui Autonomous Region, Yinchuan 750021, Ningxia, China
  • 2. School of Earth Sciences and Resources, Chang’an University, Xi’an 710054, Shaanxi, China

Received date: 2023-10-09

  Revised date: 2024-02-06

  Online published: 2024-05-21

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Abstract

The Xihuashan gold mining area is located in the Qilian tectonic metallogenic belt of the Qinling-Qilian-Kunlun orogenic belt，Machang and Liugou gold deposits have been found in the mining area.The ore-bearing strata in the area are the metamorphic strata of the Haiyuan group，and the veins are controlled by the fault zone.The ore types are mainly altered lamprophyre type，quartz vein type and altered rock type.In order to find out the genetic type and metallogenic process of the Xihuashan gold deposit，the field geological survey，microthermometry of fluid inclusionsand H-O-S isotope geochemistry of Machang and Liugou gold deposit were carried out.The results show that the homogenization temperature of quartz fluid inclusions in Machang gold deposit ranges from 140.1 ℃ to 382.6 ℃，and mainly concentrated in 250~260 ℃，the corresponding salinity is 2.57%~10.72% NaCleq.The homogenization temperature of quartz fluid inclusions in Liugou gold deposit ranges from 203.2 ℃ to 353.9 ℃，and mainly concentrated in 270~280 ℃，and the freezing point temperature is -8.2~-3.2 ℃，the corresponding salinity is 5.28%~12.08% NaCleq，mainly concentrated in 7%~8% NaCleq.The δD values of quartz in Machang gold deposit are -86.5‰~-87.2‰，and the δ 18O values are 15.4‰~16.7‰.The δD values of quartz in Liugou gold deposit are -90.2‰~-91.6‰，the δ 18O values are 15.7‰~17.0‰.Therefore，the ore-forming fluid belongs to the medium-low temperature medium-low salinity fluid，the main source of magmatic water.Additionally，the δ 34S values in the pyrite of the Machang and Liugou mine areas range from -1.00‰ to 0.27‰.The combination of the S isotopic composition in the regional stratigraphy and electron probe analysis of pyrite suggests that the sulfur source of gold-bearing sulfides（with δ 34S values close to zero） is primarily derived from deep magma，whilesulfides containing trace amount of gold or without gold are derived from the surrounding rock stratigraphy.During the Late Garidonian period，the magmatic dynamic and thermal influence of the Juewushan rock mass made the ore-forming materials in the white schist such as muscovite albite quartz schist in the Xihuashan area concentrated in fracture fissures to form early hydrothermal quartz veins. Simultaneously，in the late stage of magmatic differentiation and evolution，the ore-froming materials were separated from the magma，forming mineralized veins such as lamprophyre veins and quartz albite veins.When the solution temperature eventually dropped to the temperature of gold precipitation，the ore-forming hydrothermal fluid precipitated and enriched in the favorable position of the fault zone，forming gold deposits such as quartz vein types and fracture alteration rock types.

Key words： fluid inclusion; H-O-S isotopes; ore-forming fluid; genesis of deposit; Qilian tectonic belt; Xihuashan gold mining area

Cite this article

Li SU , Haijun ZHU , Shoujiang GU , Xingke YANG , Yichen ZHAO , Xueping SUN , Hujun HE , Ke HAN , Yuyu ZHANG , Jiang TAN , Yuanlong XIE , Long ZHANG , Libo GAO . Geological and Geochemistry Characteristics and Genesis Analysis of Gold Deposits in Xihuashan Area，Haiyuan，Ningxia[J]. Gold Science and Technology, 2024 , 32(2) : 191 -206 . DOI: 10.11872/j.issn.1005-2518.2024.02.140

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《黄金科学技术》入选《有色金属领域高质量科技期刊分级目录（优化调整）》

2024年4月18日，由中国科学技术协会组织，中国有色金属学会承担的《有色金属领域高质量科技期刊分级目录（优化调整）》发布，《黄金科学技术》入选T2级别。

据悉，《有色金属领域高质量科技期刊分级目录（优化调整）》是中国科学技术协会《分领域发布我国高质量科技期刊分级目录实施方案》的产出成果之一。

中国有色金属学会成立了专业委员会、评审委员会、核心工作团队以及诚信监督组，评审工作按照“同行评议、价值导向、等效使用”原则，制定了《有色金属领域高质量科技期刊分级目录（优化调整）发布实施方案》，评审采取定性评价与定量评价相结合的方式进行。

根据《分领域发布我国高质量科技期刊分级目录实施方案》，入选高质量科技期刊分级目录的期刊数量不超过学科期刊总数的50%，经过期刊筛选、定量评价、专家定性评审、专业委员会审议认定、学会微信公众号公示环节，产生了《有色金属领域高质量科技期刊分级目录（优化调整）》，总计232本，其中T1级别（已经接近或具备国际顶级水平的期刊）52本、T2级别（国际上知名和非常重要的较高水平权威期刊）89本、T3级别（国内外重要且被学术界所认可的期刊）91本。

http://www.goldsci.ac.cn/article/2024/1005-2518/1005-2518-2024-32-2-191.shtml

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