Chemical Mobility and Sources in Porphyry Copper Hydrothermal Alteration

斑岩铜热液蚀变中的化学迁移率和来源

• 批准号: 9018639
• 负责人: John Dilles
• 金额: $ 5.5万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-01-15 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9018639&HistoricalAwards=false
• 关键词: Chemical; Mobility; Sources; Porphyry; Copper

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.

该项目旨在测试在耶灵顿斑岩的深部钠钙蚀变过程中，围岩中的铜和其他化学成分是否被淋失。它将涉及钠钙蚀变的地质填图和岩石学相平衡研究。新鲜岩石和蚀变岩石中的S、锶、氧和钕同位素组成将被用作示踪剂，以限制这些流体和组分是来自岩基内部还是外部。综合蚀变量和损益，应能对围岩中铜、铁、锌、金、钾和其他组分的浸出作出质量平衡估计，并评估它们对铜矿体的贡献。