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首页> 外文期刊>Economic geology and the bulletin of the Society of Economic Geologists >GRADE DISTRIBUTION OF THE GIANT OK TEDI Cu-Au DEPOSIT, PAPUA NEW GUINEA
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GRADE DISTRIBUTION OF THE GIANT OK TEDI Cu-Au DEPOSIT, PAPUA NEW GUINEA

机译：新几内亚巴布亚捷安特·泰迪·古金矿床的等级分布

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The Ok Tedi porphyry Cu-Au deposit in Papua New Guinea is a world-class mineral deposit. In its pre-mining stage, it contained 5.5 Mt Cu and 18.1 Moz Au; skarn accounts for ~80% of the current 1.9 Mt Cu and 7.7 Moz Au in total resources. Two composite felsic stocks intruded a tectonostratigraphic sequence of clastic and carbonate rocks at ~1.16 ± 0.10 Ma, in a postcollisional tectonic setting. Ensuing magmatic-hydrothermal mineralization occurred within a geologically short time span of ~200 k.y. On the mine scale, heterogeneous metal grades (0-2.5% Cu) reflect contrasting styles of mineralization, conforming to classic skarn- and porphyry-type mineralization. A three-dimensional geologic model, alteration distribution, mineralization styles, and grade distribution indicate that fluids, exsolved from a deeper magma chamber, used shallow stocks as their preferred permeable pathway upward. Where limestone was present at depth, high-grade skarn formed, with the permeable stock having very low (<0.1% Cu) grade. In contrast, where the intrusions were encapsulated solely by impermeable silicified siltstone, economic grade (avg 0.6% Cu) developed within the intrusion, showing concentric patterns interpreted to represent individual magmatic pulses within the stock. The rare opportunity to visualize this in three dimensions and interact with the model is provided in the interactive electronic supplementary material.
机译：巴布亚新几内亚的Ok Tedi斑岩铜金矿床是世界一流的矿床。在开采前阶段，它含有5.5 Mt铜和18.1 Moz Au。矽卡岩约占当前1.9 Mt铜和7.7 Moz Au的总资源的80％。在碰撞后的构造环境中，两种复合长英质储层侵入了〜1.16±0.10 Ma的碎屑岩和碳酸盐岩的构造地层序列。随后发生的岩浆热液成矿作用发生在约200k.y.的地质短时间内。在矿山规模上，异质金属品位（0-2.5％Cu）反映了不同的矿化方式，符合经典的矽卡岩型和斑岩型矿化。一个三维地质模型，蚀变分布，矿化样式和品位分布表明，从较深的岩浆室中溶解出来的流体将浅层储层作为向上的首选渗透路径。在深处存在石灰石的地方，形成了高级矽卡岩，而渗透性储层的品位非常低（<0.1％Cu）。相反，如果仅用不渗透硅化粉砂岩包裹侵入物，则侵入物中会形成经济等级（平均0.6％Cu），这表明同心圆型被解释为代表了储层中的单个岩浆脉冲。在交互式电子补充材料中提供了难得的机会，可以在三个维度上可视化它并与模型进行交互。

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