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首页> 外文期刊>Contributions to Mineralogy and Petrology >Variscan ore formation and metamorphism at the Felbertal scheelite deposit (Austria): constraining tungsten mineralisation from Re-Os dating of molybdenite
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Variscan ore formation and metamorphism at the Felbertal scheelite deposit (Austria): constraining tungsten mineralisation from Re-Os dating of molybdenite

机译：Felbertal白钨矿床（奥地利）的Variscan矿石形成和变质作用：约束了辉钼矿Re-Os测年的钨矿化作用

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The Felbertal scheelite deposit in the Eastern Alps has been regarded as the type locality for stratabound scheelite deposits. It is hosted by a Cambro-Ordovician metavolcanic arc sequence with minor Variscan granitoids (approx 340 Ma) in the central Tauern Window. Re-Os model ages for molybdenite from the Felbertal tungsten deposit range between approx358 and approx 336 Ma and record several pulses of mag-matic-hydrothermal-metamorphic molybdenite formation. Molybdenite ages from the K2 orebody, a scheelite-rich quartz mylonite in the Western ore field, indicate that both mineralisation and mylonite are Variscan in age and suggest that the shear zone was active for approx0 million years. Early stage tungsten mineralisation {Scheelite 1} in quartzitic ores in the Eastern ore field, which is free of molybdenite, yielded very low to near blank levels of Re and Os and thus could not be dated. However, molybdenite from scheelite-quartz stringers, previously interpreted as a feeder stockwork to quartzitic scheelite ore of presumed Cambrian age, yielded Variscan Re-Os ages of approx342 and approx337 Ma. Dating of molybdenite contained in scheelite ores thus far provides no indication of a Cambrian component to the tungsten mineralisation. Our data are consistent with a model of either granite intrusion-related ore formation and coeval metamorphic overprint during the Early Carboniferous or, alternatively, molybdenite formation may be exclusively attributed to Variscan metamorphism (see Stein 2006).
机译：东阿尔卑斯山的Felbertal白钨矿床被认为是层状白钨矿床的类型所在地。它由在Tauern窗中央的Cambro-Ordovician火山弧序列和较小的Variscan花岗岩（约340 Ma）所托管。 Re-Os在Felbertal钨矿床中模拟了辉钼矿的年龄，范围介于约358 Ma和约336 Ma之间，并记录了岩浆-水热-变质辉钼矿形成的几个脉冲。来自K2矿体的辉钼矿年龄（西部矿场中富含白钨矿的石英my石）表明，成矿作用和my石均属于Variscan年龄，并表明剪切带活跃了大约0百万年。东部矿石田中不含钼辉石的石英矿石中的早期钨矿化{Scheelite 1}，其Re和Os含量很低甚至接近空白，因此无法确定日期。但是，白钨矿-石英桁条中的辉钼矿以前被解释为假定寒武纪年龄的石英白钨矿矿石的补给料，产生了大约342和大约337 Ma的瓦里斯坎Re-Os年龄。迄今为止，白钨矿中所含的辉钼矿的日期未提供钨矿化的寒武纪成分的迹象。我们的数据与早期石炭纪期间与花岗岩侵入有关的矿石形成和同时代变质叠印的模型相一致，或者，辉钼矿的形成可能完全归因于瓦里斯坎变质作用（参见Stein 2006）。

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