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2023 Vol. 42, No. 11
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CHEN Gang, CHEN Maohong, GE Rui, LI Yanglin, WANG Yu, PANG Honghai, HUANG Rui, WU Qiqiang. 2023. Magmatic-hydrothermal metallogenic system in Zhenlongshan, Guangxi: Evidence from ore-forming fluids and materials. Geological Bulletin of China, 42(11): 1854-1874. doi: 10.12097/j.issn.1671-2552.2023.11.006
Citation: CHEN Gang, CHEN Maohong, GE Rui, LI Yanglin, WANG Yu, PANG Honghai, HUANG Rui, WU Qiqiang. 2023. Magmatic-hydrothermal metallogenic system in Zhenlongshan, Guangxi: Evidence from ore-forming fluids and materials. Geological Bulletin of China, 42(11): 1854-1874. doi: 10.12097/j.issn.1671-2552.2023.11.006
shu

Magmatic-hydrothermal metallogenic system in Zhenlongshan, Guangxi: Evidence from ore-forming fluids and materials

  • 1.

    MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China

  • 2.

    Wanbao Mining Ltd., Beijing 100053, China

  • 3.

    Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

  • 4.

    No. 273 Geological Team of Guangxi Zhuang Autonomous Region, Guigang 537101, Guangxi, China

  • 5.

    No. 6 Geological Team of Guangxi Zhuang Autonomous Region, Guigang 537100, Guangxi, China

More Information
Received Date:  30 October 2021
Revised Date:  22 December 2021
Publish Date:  15 November 2023
    Abstract

  • The Zhenlongshan magmatic hydrothermal metallogenic system is located in the dome formed by a large short axis anticline in the front arc of the "mountain shaped structure" in Guangxi.The deposits (occurrence) mainly occur in the Cambrian and Devonian clastic rocks.Fluid inclusion thermometry, laser Raman, and H-O-S isotope studies were conducted on typical ore deposits.The system elucidated the source of ore-forming fluids, characteristics and evolution of ore-forming fluids, and sources of ore-forming materials for gold, silver, copper, lead, and zinc deposits around the porphyry, and preliminarily explored the genetic connections of various ore deposits (occurrence) around the porphyry.The results show that the inclusions are mainly gas-liquid inclusions, and contain more CO2 and CH4 inclusions, and occasionally contain NaCl daughter crystals.The homogenization temperature of high temperature deposit is 320~339℃, and the salinity is 8%~9% NaCl eqv; the homogenization temperature of medium temperature deposit is 280~299℃, and the salinity is 7%~8% NaCl eqv; the homogenization temperature of low temperature deposit is 160~179℃, and the salinity is 5%~6% NaCl eqv.That is, with the decrease of homogenization temperature, salinity also decreases.The δDV-SMOW and δ18OV-PDB of quartz concentrate in -55‰~-80.1‰ and -9.1‰~-18.8‰.The H-O isotopic diagram is mainly in the range of magmatic water and tends to shift to meteoric water, which indicates that the main source of fluid in the above deposit may be magmatic water, and there is the mixing of meteoric water in the later stage.The sulfur isotope peak values are concentrated in the range of -2‰~2‰, in which arsenopyrite is mainly positive and stibnite is mainly negative.Generally, there is a relatively uniform sulfur source, indicating that the sulfur in sulfide comes from magma.The above research shows that the distribution of ore deposits (occurrence) in Zhenlongshan area has obvious zoning characteristics of magmatic hydrothermal metallogenic system.Porphyry high temperature hydrothermal deposits are developed in the pluton and its edge, and the periphery gradually transits to medium and low temperature hydrothermal deposits.The horizontal and vertical mineralization zoning model for the magmatic hydrothermal metallogenic system in Zhenlongshan area are established.

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