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Year 2025
 
Issue 5 [10 - 2025], Year XXXIV

Sources of au-bearing mineralisation in the Dong Chat deposit, Central Truong Son belt, Vietnam: Insights from sulfur isotopes

https://mij.hoimovietnam.vn/en/archives?article=25058

  • Affiliations:

    Vietnam Institute of Geosciences and Mineral Resources ,67 Chien Thang, Ha Noi, Vietnam

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  • Received: 17th-Aug-2025
  • Revised: 25th-Sept-2025
  • Accepted: 28th-Sept-2025
  • Online: 1st-Oct-2025
Pages: 66 - 73
Views: 30
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Abstract:

The Truong Son Belt is one of the largest and most important gold metallogenic belts in Southeast Asia. The Dong Chat hydrothermal gold occurrence, situated in the central segment of the belt, has yet to be systematically explored and studied in detail. Sulfur-isotope (δ³⁴S) analyses of five pyrite samples from the deposit yield values ranging from +1.23‰ to −3.87‰, mostly clustering between −3.87‰ and −1.52‰ with a narrow spread (~5‰). These data indicate a relatively homogeneous ore-forming fluid and reduced sulfur derived from deep magmatic/mantle or metamorphic sources, while effectively excluding significant contributions from seawater sulfate or bacterial sulfate reduction. Compared with the nearby Me Xi deposit, the Dong Chat values are less negative and more uniform, implying negligible mixing of sulfur from sedimentary sources. Overall, the results are consistent with the mineralization characteristics of the Dong Chat deposit and the geological–metallogenic framework of the Truong Son Belt, and they provide a foundational isotopic dataset for subsequent in-depth studies.

How to Cite
Ngo, D.Xuan, Trinh, S.Hai, Bui, A.The, Nguyen, T.Thanh, Nguyen, T.Duc and Nguyen, X.Thi 2025. Sources of au-bearing mineralisation in the Dong Chat deposit, Central Truong Son belt, Vietnam: Insights from sulfur isotopes (in Vietnamese). Mining Industry Journal. XXXIV, 5 (Oct, 2025), 66-73. .
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