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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。
The O Quy Ho molybdenum deposit in northwestern Vietnam is one of the typical molybdenum deposits of the Fan Shi Edition metallogenic belt. The ore body is located in the Mesozoic granite in vein form. The molybdenite mainly occurs in quartz veins and feldspar quartz veins, With pyrite, chalcopyrite, magnetite and other symbiosis. The results of sulfur isotope analysis of 8 samples indicate that δ34S is between 0.14 ‰ and 3.34 ‰, with an average value of 1.53 ‰, indicating that the metallogenic material has deep source characteristics. The 206Pb / 204Pb ranges from 18.583 to 22.355 for the pyrite and from 15.632 to 15.812 for the 207Pb / 204Pb and from 38.989 to 39.199 for the 208Pb / 204Pb. The 206Pb / 204Pb, 207Pb / 204Pb and 208Pb / 204Pb of the molybdenite are 18.686 ~ 18.737, 15.655 ~ 15.660 and 39.081 ~ 39.082, respectively, which is related to the genesis of the amphibole-bearing granite porphyry. The Re-Os isotopic dating of molybdenite was (36 ± 1) Ma dating to the age of the magmatic-mineralization event of the Cenozoic porphyry Cu-Mo mineralization in the Jinshajiang-Honghe, suggesting The O Quy Ho molybdenum deposit is part of the Jinshajiang-Honghe Cenozoic porphyry copper-molybdenum belt.