Surface Water Influx and Mass-Transfer Modeling of the Fossil Archean Hydrothermal System at Wiluna, Australia

该项目将重点研究太古宙威鲁纳金矿床热液系统上部的流体演化。地表和深部成矿流体的混合可能是金和其他金属的重要沉淀机制。这项研究的目的是限制威鲁纳沉积物中的地表水成分，并量化交代带中的流体通量。这将是第一次研究太古宙地表水的性质和在太古代矿金系统中的作用。通过对流体包裹体的GC/IC、PIXE探针和惰性气体分析，以及对均一组流体包裹体和蚀变矿物的稳定同位素分析，将对古热液系统的地表水成分进行定量。传质模型将量化流经渠道和围岩的流体流动，并将定量流体混合作为矿脉上部的金沉淀机制。这项研究将与珀斯的关键战略矿藏中心和堪培拉的矿产资源局合作进行。

This project will focus on fluid evolution in the upper part of the hydrothermal system at the Archean Wiluna lode-gold deposits. The mixing of surface and deep-seated ore fluids may be an important precipitation mechanism for gold and other metals. The goal of this study is to constrain surface water components in the Wiluna deposits, and to quantify fluid fluxes in the metasomatic zones. This will be the first to study the nature and role of surface waters in Archean lode-gold systems. The surface water components of the fossil hydrothermal system will be quantified by GC/IC, PIXE-probe, and noble gas analyses on fluid inclusions, and stable isotope analyses on homogeneous groups of fluid inclusions and alteration minerals. Mass- transfer modeling will quantify fluid flow through channel ways and wallrock, and will quantify fluid mixing as a gold precipitation mechanism in the upper parts of the lodes. This research will be conducted in collaboration with the Key Centre for Strategic Mineral Deposits, Perth and the Bureau of Mineral Resources, Canberra.