Contact-style magmatic sulphide mineralisation in the Labrador Trough, northern Quebec, Canada: implications for regional prospectivity

Contact-style magmatic sulphide mineralisation in the Labrador Trough, northern Quebec, Canada: implications for regional prospectivity
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加拿大魁北克北部拉布拉多海槽的接触式岩浆硫化物矿化:对区域前景的影响

DOI:
10.1139/cjes-2019-0137
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发表时间:
2020
影响因子:
1.4
通讯作者:
Smith W
Smith W
中科院分区:
地球科学4区
文献类型:
--
作者:
Smith W

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魁北克省北部的拉布拉多海槽目前是岩浆镍铜铂族元素(PGE)硫化物矿持续勘探的重点。该地质带拥有大量玄武岩基岩和蒙塔格尼基岩复合体的熔岩,它们局部位于硫化物变沉积质乡村岩石中。最近发现的 Idefix PGE-Cu 矿区代表了一堆辉长岩基岩,其中层状斑片状散播到网状结构的硫化物(0.2–0.4 g/t PGE+Au),厚度约为 20 m,长达 7 km。此外,球状硫化物出现在靠近变沉积岩的基部底部。全岩和铂族元素地球化学表明,岩床具有共同的来源,并且提取的岩浆在进入上地壳之前经历了显着的分馏。为了开发富含 PGE 的矿石,在最终就位之前就达到了硫化物熔体饱和,在 R 因子达到 ∼10 000 时达到峰值。沿基台底部夹带的球状硫化物吸收了地壳衍生的砷,并最终保留在前进的冷却边缘中。
The Labrador Trough in northern Quebec is currently the focus of ongoing exploration for magmatic Ni-Cu-platinum group element (PGE) sulphide ores. This geological belt hosts voluminous basaltic sills and lavas of the Montagnais Sill Complex, which are locally emplaced among sulphidic metasedimentary country rocks. The recently discovered Idefix PGE-Cu prospect represents a stack of gabbroic sills that host stratiform patchy disseminated to net-textured sulphides (0.2–0.4 g/t PGE+Au) over a thickness of ∼20 m, for up to 7 km. In addition, globular sulphides occur at the base of the sill, adjacent to the metasedimentary floor rocks. Whole-rock and PGE geochemistry indicates that the sills share a common source and that the extracted magma underwent significant fractionation before emplacement in the upper crust. To develop the PGE-enriched ores, sulphide melt saturation was attained before final emplacement, peaking atRfactors of ∼10 000. Globular sulphides entrained along the base of the sill ingested crustally derived arsenic and were ultimately preserved in the advancing chilled margin.
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