The episode of widespread organic carbon deposition marked by peak black shale sedimentation during the Palaeoproterozoic is also reflected in exceptionally abundant graphite deposits of this age. Worldwide anoxic/euxinic sediments were preserved as a deep crustal reservoir of both organic carbon, and sulphur in accompanying pyrite, both commonly >1 wt %. The carbon- and sulphur-rich Palaeoproterozoic crust interacted with mafic magma to cause Ni–Co–Cu–PGE mineralization over the next billion years, and much uranium currently produced is from Mesoproterozoic deposits nucleated upon older Palaeoproterozoic graphite. Palaeoproterozoic carbon deposition has thus left a unique legacy of both graphite deposits and long-term ore deposition.

中文翻译：

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古元古代石墨增强碳埋藏及其成矿遗产

古元古代期间以黑色页岩沉积峰值为标志的广泛有机碳沉积事件也反映在这个时代异常丰富的石墨沉积物中。全球缺氧/常温沉积物被保存为深部地壳储层，其中有机碳和伴随黄铁矿中的硫含量通常 > 1 wt%。富含碳和硫的古元古代地壳与镁铁质岩浆相互作用，在接下来的十亿年中导致 Ni-Co-Cu-PGE 矿化，目前生产的大部分铀来自中元古代成核在较老的古元古代石墨上的矿床。因此，古元古代碳沉积留下了石墨沉积和长期矿石沉积的独特遗产。