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首页> 外文期刊>Surveys in Geophysics: An International Review Journal of Geophysics and Planetary Sciences >Testing Hypotheses for the Mount Isa Copper Mineralisation with Numerical Simulations
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Testing Hypotheses for the Mount Isa Copper Mineralisation with Numerical Simulations

机译：使用数值模拟测试伊萨山铜矿化的假设

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摘要

We have applied reactive transport simulations to evaluate conceptual models of hydrothermal fluid flow related to the Mesoproterozoic Mount Isa copper mineralisation. Numerical experiments have been performed specifically to investigate whether fluid flow was driven by mechanical deformation, higher than hydrostatic fluid pressure gradients, or thermal buoyancy, and what the mechanism of ore deposition was. One distinct feature of the Mount Isa mineralising system is a region of massive silica-rich alteration that surrounds the copper ore bodies within the Urquhart shale, indicating upward flow of a cooling fluid. Hydromechanical modelling revealed that contraction and horizontal shear can produce a dilation pattern that favours upward fluid flow, whereas strike slip movement causes dilation of pre-existing vertical structures. Reactive transport models show that hydraulic head driven flow is more likely to produce a more realistic silica alteration pattern than free thermal convection, but neither process generates a flow pattern capable of precipitating copper at the appropriate location. Instead we propose that gravity driven flow of a dense oxidised basin brine led to chalcopyrite mineralisation by fluid-rock reaction.
机译：我们已经应用了反应性输运模拟来评估与中元古生代伊萨山铜矿化有关的热液流体流动的概念模型。专门进行了数值实验，以研究流体流动是由机械变形驱动的，高于静液压压力梯度还是由热浮力驱动的，以及矿石沉积的机理是什么。伊萨山矿化系统的一个显着特征是，大量富含二氧化硅的蚀变区域围绕着厄克特页岩中的铜矿体，表明冷却流体向上流动。流体力学建模表明，收缩和水平剪切会产生有利于向上流体流动的扩张模式，而走滑运动会导致先前存在的垂直结构扩张。反应性传输模型表明，与自由热对流相比，液压头驱动的流更可能产生更逼真的二氧化硅蚀变模式，但两种工艺都不会产生能够在适当位置沉淀铜的流型。取而代之的是，我们提出重力驱动的浓氧化盆地盐水流通过流体-岩石反应导致黄铜矿矿化。

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