| 越南O Quy Ho钼矿床的成矿时代及成矿物质来源探讨 |
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| 引用本文：NGUYEN Quang Luat,陈越,邹运鑫.2010.Metallogenic epoch and metallic sources of O Quy Ho molybdenum deposit, Vietnam[J].Mineral Deposits,29(2):371~378 |
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| 基金项目:国家973项目（2009CB421001）、国土资源部公益性行业科研专项经费项目（200811008）、教育部111计划（B07011）与科技支撑计划（2006BABO1A03） |
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| 中文摘要:越南西北部O Quy Ho钼矿床为范士版成矿带的典型钼矿床之一，矿体 以脉状形式就位于中生代花岗岩中，辉钼矿主要赋存于石英脉及长石石英脉中，与黄铁 矿、黄铜矿、磁铁矿等共生。8件样品硫同位素分析结果表明，δ34S介于0.14‰～3.34‰之间，平均值为1.53‰，表明成矿物质具有深源特征。黄铁矿的206Pb/204Pb范围为18.583～22.355，207Pb/204Pb变化于15.632～15.812之间，208Pb/204Pb变化于38.989～39.199；辉 钼矿的206Pb/204Pb、207Pb/204Pb、208Pb/204Pb分别为18.686～18.737、15.655～15.660和39.081～39.082，与范士版含角闪石花岗斑岩具有成因联系。辉钼矿Re-Os同位素等时线测年获 得了（36±1） Ma的年龄，该年龄与金沙江-红河新生代斑岩铜钼矿成矿带岩浆-成矿活动的年龄一致，提出O Quy Ho钼矿床为金沙江_红河新生代斑岩铜钼矿带的一部分。 |
| 中文关键词:地球化学 Re-Os同位素年龄 O Quy Ho 钼矿床 金沙江-红河斑岩铜钼矿带 哀牢山剪切带 越南西北 |
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| Metallogenic epoch and metallic sources of O Quy Ho molybdenum deposit, Vietnam |
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| Abstract:The O Quy Ho ore deposit is a typical molybdenum deposit in the Phan Si Pan metallogenic belt, northwest Vietnam. Ore bodies occur as quartz veins or quartzofelspathic veins intruding Mesozoic granite. Molybdenite has formed an ore mineralization sequence with pyrite, chalcopyrite, magnetite and some other minerals. The δ34S values of pyrite and molybdenite are between 0.14‰ and 3.34‰, with an average of 1.53‰，implying that sulfur of ore-forming materials was derived from a deep source. The206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios of pyrite vary in ranges of 18.583～22.355, 15.632～15.812, 38.989～39.199; the ranges of 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios for molybdenite are 18.686～18.737, 15.655～15.660 and 39.081～39.082, respectively. The uniform Pb isotope compositions of the ore deposit imply that the ore mineralization sequence is possibly related to the Phan Si Pan amphibole-bearing porphyritic intrusions of the same age. Re-Os dating of molybdenite samples gives an isochron age of (36±1) Ma, suggesting that the O Quy Ho ore deposit is a part of the Jinsha River-Red River porphyry Cu-Mo mineralization belt. |
| keywords:geochemistry, Re-Os isochron age, O Quy Ho molybdenum deposit, Jinsha River-Red River porphyry Cu-Mo mineralization belt, Ailaoshan shear zone, northwest Vietnam |
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