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A metasomatized lithospheric mantle control on the metallogenic signature of post-subduction magmatism

机译:俯冲后岩浆作用成矿作用的岩石交界地幔控制

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摘要

Ore deposits are loci on Earth where energy and mass flux are greatly enhanced and focussed, acting as magnifying lenses into metal transport, fractionation and concentration mechanisms through the lithosphere. Here we show that the metallogenic architecture of the lithosphere is illuminated by the geochemical signatures of metasomatised mantle rocks and post-subduction magmatic-hydrothermal mineral systems. Our data reveal that anomalously gold and tellurium rich magmatic sulfides in mantle-derived magmas emplaced in the lower crust share a common metallogenic signature with upper crustal porphyry-epithermal ore systems. We propose that a trans-lithospheric continuum exists whereby post-subduction magmas transporting metal-rich sulfide cargoes play a fundamental role in fluxing metals into the crust from metasomatised lithospheric mantle. Therefore, ore deposits are not merely associated with isolated zones where serendipitous happenstance has produced mineralisation. Rather, they are depositional points along the mantle-to-upper crust pathway of magmas and hydrothermal fluids, synthesising the concentrated metallogenic budget available.
机译:矿床是地球上的一个场所,在这里能量和质量通量得到了极大的增强和集中,充当了通过岩石圈进行金属传输,分馏和富集机制的放大透镜。在这里,我们显示岩石圈的成矿构造被交代化的地幔岩石和俯冲后的岩浆热液矿物系统的地球化学特征所照亮。我们的数据表明,位于下地壳的地幔衍生岩浆中异常富含金和碲的岩浆硫化物与上地壳斑岩-上热矿石系统具有共同的成矿特征。我们建议存在一个跨岩圈连续体,由此,俯冲后岩浆运输富含金属的硫化物货物在将金属从交代的岩石圈地幔中熔入地壳中起着基本作用。因此,矿床不仅与偶然的偶然事件产生矿化的孤立区域有关。相反,它们是沿岩浆和热液从地幔到上地壳路径的沉积点,合成了可用的集中成矿预算。

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