Chemical Mobility and Sources in Porphyry Copper Hydrothermal Alteration

该项目旨在测试铜和其他化学品是否 在深部钠钙作用过程中， 耶灵顿斑岩的蚀变 它将涉及地质学 钠钙质岩的填图和岩石学相平衡研究 变更。 新鲜样品中的S、Sr、O和Nd同位素组成， 蚀变岩石将被用作示踪剂，以约束这些是否 流体和组分起源于岩基内部或外部。 合并变更量和损益量应 产生围岩浸出Cu、Fe、Zn的质量平衡估计， Au、K和其他成分，并允许评估其 对铜矿体的贡献。

This project is designed to test whether Cu and other chemical components are leached from wallrock during deep sodic-calcic alteration in the Yerington porphyry. It will involve geologic mapping and petrologic phase equilibria studies of sodic-calcic alteration. S, Sr, O, and Nd isotopic compositions in fresh and altered rocks will be used as tracers to constrain whether these fluids and components originated inside or outside the batholith. Integration of volumes of alteration and gains or losses should yield a mass-balance estimate of wallrock leaching of Cu, Fe, Zn, Au, K, and other components and allow assessment of their contribution to the Cu ore body.