Chemical Mobility and Sources in Porphyry Copper Hydrothermal Alteration

本项目旨在测试叶林顿斑岩深部钠-钙蚀变过程中是否有Cu等化学成分从围岩中浸出。它将涉及地质填图和钠钙蚀变的岩石学相平衡研究。新鲜和蚀变岩石中的S、Sr、O和Nd同位素组成将被用作示踪剂，以确定这些流体和成分是来自岩基内部还是外部。综合蚀变量和损益，可以得出Cu、Fe、Zn、Au、K和其他成分的围岩浸出的质量平衡估计，并可以评估它们对铜矿体的贡献。

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.