Volume 28 Issue 3
Jun.  2022
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Article Navigation >  Journal of Geomechanics  > 2022  >  28(3): 464-479
WANG Xiaohu, GUO Tao, LI Xiaozhuang, et al., 2022. A study on the geochemical characteristics and metallogenesis of the Lanmugou gold deposit in the South Qinling Belt, Shaanxi, China. Journal of Geomechanics, 28 (3): 464-479. DOI: 10.12090/j.issn.1006-6616.2021002
Citation: WANG Xiaohu, GUO Tao, LI Xiaozhuang, et al., 2022. A study on the geochemical characteristics and metallogenesis of the Lanmugou gold deposit in the South Qinling Belt, Shaanxi, China. Journal of Geomechanics, 28 (3): 464-479. DOI: 10.12090/j.issn.1006-6616.2021002
shu

A study on the geochemical characteristics and metallogenesis of the Lanmugou gold deposit in the South Qinling Belt, Shaanxi, China

doi: 10.12090/j.issn.1006-6616.2021002
  • 1.

    Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

  • 2.

    Key Laboratory of Paleomagnetism and Tectonic Reconstruction, Ministry of Natural Resources, Beijing 100081, China

  • 3.

    Shaanxi Geology and Mining First Geological Team Co. Ltd, Ankang 725099, Shaanxi, China

Funds:

the National Key Research and Development Program of China 2021YFC2901805

the Geological Survey Project of China Geological Survey 12120114014201

More Information
  • Received: 2021-01-06
  • Revised: 2022-05-01
    Abstract
  • The Lanmugou gold deposit is located in Xunyang County, Shaanxi Province, produced in the Indosinian Shiquan-Shenhe thrust nappe of the South Qinling, and controlled by the Heihumiao brittle-ductile shear zone. In this paper, via the analysis of the mineralization background, ore-controlling structure features and geochemical characteristics of the deposit, the preliminary conclusions on the geological characteristics and metallogenesis of the Lanmugou gold deposit have been obtained. Co content of pyrite in strata varies from 67.6×10-6 to 208×10-6, Ni content from 108×10-6 to 585×10-6, and the total amount of rare earth elements from 2.16×10-6 to 22.9×10-6. Simultaneously, Co content in hydrothermal pyrite varies from 317×10-6 to 751×10-6, Ni content from 82.8×10-6 to 304×10-6, and the total amount of rare earth elements from 4.04×10-6 to 51.74×10-6. δ34S value in hydrothermal pyrite ranges from 9.9‰ to 12.1‰, with the average value of 11.27‰. 206Pb/204Pb value of hydrothermal pyrite ranges from 18.560 to 20.206, 207Pb/204Pb value from 15.668 to 15.708, 208Pb/204Pb value from 38.257 to 38.860; 206Pb/204Pb value of pyrite in the strata ranges from 18.502 to 20.086, 207Pb/204Pb value from 15.644 to 15.788 and 208Pb/204Pb value from 38.475 to 38.907. δ18OV-SMOW value of quartz in ore ranges from 13.5‰ to 15.9‰, with the average value of 14.7‰, and the δDV-SMOW value ranges from -77.8‰ to -71.3‰, with the average value of -74.55‰. Re-Os isochron age of pyrite in the ore is 202±12 Ma. From the comprehensive studies, it is concluded that the source of ore-forming materials of the Lanmugou gold deposit is from the interlayer of volcanic rocks in strata, and the ore-forming fluids are multiple-sourced (basically metamorphic water derived from interlayer water, atmospheric precipitation). The inference of metallogenesis is that the ore-forming hydrothermal fluids filled the lamellae of brittle-ductile shear zone and the minerals were precipitated and enriched in the extension stage after the collision of the Qinling orogenic belt at the end of the late Triassic-early Jurassic. The metallogenic characteristics show that the Lanmugou deposit is an orogenic gold deposit.

     

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