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    Volume 50 Issue 7
    Jul.  2025
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    Wang Lei, Wang Xiangdong, Hu Jun, Jin Xinbiao, Zhang Xiong, Tan Juanjuan, 2025. Superimposed Mineralization of Dabaoshan Polymetallic Deposit in Guangdong Province: Evidence from Sulfide Re-Os and Rb-Sr Dating and In-Situ Trace Element Analysis. Earth Science, 50(7): 2548-2565. doi: 10.3799/dqkx.2025.104
    Citation: Wang Lei, Wang Xiangdong, Hu Jun, Jin Xinbiao, Zhang Xiong, Tan Juanjuan, 2025. Superimposed Mineralization of Dabaoshan Polymetallic Deposit in Guangdong Province: Evidence from Sulfide Re-Os and Rb-Sr Dating and In-Situ Trace Element Analysis. Earth Science, 50(7): 2548-2565. doi: 10.3799/dqkx.2025.104

    Superimposed Mineralization of Dabaoshan Polymetallic Deposit in Guangdong Province: Evidence from Sulfide Re-Os and Rb-Sr Dating and In-Situ Trace Element Analysis

    doi: 10.3799/dqkx.2025.104
    • Received Date: 2025-04-09
    • Publish Date: 2025-07-25
    • The Dabaoshan deposit is a large-sized polymetallic deposit within the Qin-Hang Metallogenic Belt, and it is still controversial whether there has been submarine exhalative sedimentation. In this study, we conducted isotopic dating and in-situ elemental analysis of various sulfides in the deposit, having obtained Re-Os isochron age of (366±33) Ma for pyrrhotites and Rb-Sr isochron age of (166.3±2.5) Ma for sphalerite, respectively. The pyrrhotite is characterized by low concentrations of Co and Te, and high concentrations of Ni and Se, with Co/Ni ratios predominantly below 1, indicating a sedimentary origin. Additionally, sphalerite is relatively enriched in elements such as Fe, Mn, Cd, Ga, In, and Sn, exhibiting relatively low Zn/Cd and Cd/Fe ratios, low Co content, and high Sn content, indicating a sedimentary exhalative origin. Generally, the Dabaoshan polymetallic deposit experienced mineralization through Devonian exhalative sedimentation mineralization, followed by Jurassic magmatic-hydrothermal superimposition. The Re-Os isotope system of sulfides remained stable at a mineralization temperature around 400 ℃, preserving the in-situ geochemical signatures of the initial sedimentary processes. The findings provide valuable insights into the genesis of massive sulfide deposits in South China.

       

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