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首页> 外文OA文献 >Geology, geochronology and isotopic geochemistry of the Xiaoliugou W-Mo ore field in the Qilian Orogen, NW China:case study of a skarn system formed during continental collision
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Geology, geochronology and isotopic geochemistry of the Xiaoliugou W-Mo ore field in the Qilian Orogen, NW China:case study of a skarn system formed during continental collision

机译：西北祁连造山带小柳沟钨钼矿田的地质，年代学和同位素地球化学：以大陆碰撞形成的矽卡岩系统为例

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The Xiaoliugou W-Mo ore field lies within the mid-Paleozoic North Qilian Orogen, NW China, and hosts a W resource of 48.8 Mt @ 0.4% and 412.6 Mt of Mo @ 0.075%. It contains five deposits, including Xiaoliugou, Qiqing, Guishan, Qibao and Shiji. The main mineralization styles at Xiaoliugou are skarn and veins in which the mineral sequence is scheelite > molybdenite > chalcopyrite and occurs in the endo- and exo-contact zones of granite intrusions. The scheelite-dominated orebodies are overprinted by molybdenite-dominated quartz veins. Two molybdenite samples yielded Silurian Re-Os model ages of 427.4 ± 6.0 Ma and 428.2 ± 6.0 Ma. Three muscovite samples coexisting with molybdenite yielded Middle Devonian Ar-Ar ages of 392.0 ± 2.7 Ma, 391.1 ± 2.7 Ma and 391.4 ± 2.8 Ma. The Re-Os and Ar-Ar ages indicate that the W-Mo mineralization and alteration occurred at ca. 428–391 Ma, which corresponds with regional continental collision within the Qilian Orogen. δS for the sulfides molybdenite and pyrite are 7.70–11.67 ‰ and 4.98–13.17 ‰, respectively. The Pb/Pb,Pb/Pb and Pb/Pb of the sulfides are 17.98–21.73, 15.34–18.81, and 37.18–38.63, respectively. The granites yield similar corrected (Pb/Pb), (Pb/Pb) and (208Pb/204Pb), ranging 16.14–19.35, 15.44–15.63, and 37.41–38.31, respectively. Calculated δO of the fluid inclusions in quartz range from -3.38–2.34 ‰, whereas the δD of the hydrothermal fluids ranges from -94 to -47 ‰. The S-, Pb-, O- and D-isotopic data imply that the metals originated from the granite intrusion with a minor component sourced from the host sediments, and that the ore-forming fluids were dominated by magmatic-hydrothermal fluids mixed with minor meteoric water.
机译：小柳沟钨钼矿田位于中国西北部古生界北祁连造山带中，含钨量为48.8 Mt @ 0.4％和412.6 Mt Mo @ 0.075％。它包含五个矿床，分别是小流沟，启庆，龟山，岐宝和石鸡。小六沟的主要矿化类型为矽卡岩和脉状，其矿物序列为白钨矿>辉钼矿>黄铜矿，发生在花岗岩侵入的内外接触区。白钨矿为主的矿体被辉钼矿为主的石英脉覆盖。两个辉钼矿样品产生的志留纪Re-Os模型年龄为427.4±6.0 Ma和428.2±6.0 Ma。与辉钼矿共存的三个白云母样品的中泥盆纪Ar-Ar年龄分别为392.0±2.7 Ma，391.1±2.7 Ma和391.4±2.8 Ma。 Re-Os和Ar-Ar年龄表明W-Mo的矿化和蚀变发生在大约。 428-391 Ma，对应于祁连造山带内的区域性大陆碰撞。硫化物辉钼矿和黄铁矿的δS分别为7.70-11.67‰和4.98-13.17‰。硫化物的Pb / Pb，Pb / Pb和Pb / Pb分别为17.98-21.73、15.34-18.81和37.18-38.63。花岗岩产生相似的校正后（Pb / Pb），（Pb / Pb）和（208Pb / 204Pb），范围分别为16.14-19.35、15.44-15.63和37.41-38.31。石英中流体包裹体的δO计算值为-3.38–2.34‰，而热液流体的δD为-94至-47‰。 S，Pb，O和D同位素数据表明，金属来自花岗岩侵入体，微量成分来自宿主沉积物，成矿流体主要由岩浆-热液混合而成。大气水。

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