Reconnaissance study on sulfur isotopic ratios of lead-zinc ores from North Vietnam

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  • Ishihara Shunso
    National Institute of Advanced Industrial Science and Technology (AIST)
  • Anh Tran Tuan
    Institute of Geological Sciences, Vietnamese Academy of Science and Technology
  • Qin Kezhang
    Institute of Geology and Geophysics, Chinese Academy of Sciences

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  • 北部ベトナムからの鉛亜鉛鉱石の硫黄同位体比の予察的研究

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    Sulfur isotopic ratios were studied on representative lead-zinc feeding ores, zinc concentrates and lead concentrates from selected mines in North Vietnam. These sulfi des from the Triassic rhyolite hosted ore deposits have δ34S values of +3.4 to +4.7 ‰, while those from purely Paleozoic sedimentary host rocks are slightly heavier, ranging from +4.4 to +8.2 ‰. No δ34S values similar to those of the Mississippi Valley-type lead-zinc ores have been found. Lead concentrates are always smaller than zinc concentrates in the δ34S values. Two very depleted δ34S values were found in the Cho Dien mine area where detailed isotopic study is necessary.

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