Acid-Sulfate Epithermal Processes and the Relationship of the Deep Summitville System to the Shallow Gold Ore

萨米特维尔是酸性硫酸盐类型矿床的典型例子，但深部钻探表明，在其下面存在“斑岩型”脉网和深部蚀变。深部成矿作用尚未得到认真研究或定年。该项目旨在详细描述深部矿化的矿脉和蚀变，并确定它们的年龄(绢云母和明矾石上的K-Ar)和与金有关的浅层明矾石。应该可以确定“斑岩型”矿化与浅层铜-金矿化的关系的性质，以及两者与诸如蒙大拿州布特的其他榴辉岩-斜长岩矿体的关系。另一个方面是通过新发现的降低pH沸腾过程对金闪锌矿-辉石-金沉淀的数值模拟。将使用魔法衍生的水和混合的大气水。它还计划模拟混合和围岩反应的过程。对酸性-硫酸盐类浅成热液矿床的成矿作用和围岩反应过程应有一个清晰的认识。

Summitville is a classic example of the acid sulfate type of ore deposit, but deep drilling shows that there are "porphyry-type" vein stockworks and alteration at depth beneath. The deep mineralization has not been carefully studied or dated. This project is to describe in detail the veins and alteration of the deep mineralization and to date them (K-Ar on sericite and alunite) and the shallow alunite associated with gold. It should be possible to establish the nature of the relationship of the "porphyry-type" mineralization to the shallow copper-gold and the relation of both to other occurrences of enargite-covellite lodes such as those in Butte, Montana. Another aspect is numerical modeling of covellite-enargite-gold precipitation by the newly recognized process of boiling with decreasing pH. Magmatically-derived waters with admixed meteoric waters will be used. It is also planned to model processes of mixing and wall rock reaction. A clear understanding of the processes of ore precipitation and wall rock reaction in acid-sulfate-type epithermal ore deposits should be established.