Origin of hydrothermal mineral deposits

我的研究计划的长期目标是了解热液流体的来源，流动路径，化学和同位素交换，以及在地壳中循环形成热液矿床的混合历史。在这个发现基金提案中，重点将是表征流体及其从变质源形成热液造山带金矿化的途径。这些数据有助于重建古代热液系统的地壳水文地质，以了解这些流体如何形成重要的矿产资源。控制地壳尺度热液流动的参数研究使用复杂的三维数值模型，模拟热液流体和离散裂缝切割的岩石基质之间的运输和交换。在今后5年的长期研究计划中，我拟对造山带金矿化进行从流体流动路径、来源到局部金沉淀的综合研究，包括三个具体项目：1)以大型造山带金矿（Sigma、Abitibi）为尺度的地壳水文地质研究，了解与区域尺度流体流动模式相关的矿床尺度流体流动模式；2)造山金脉中共存石英(O)和电气石（H、B、O、Sr）的原位稳定同位素组成，解决造山金矿床形成过程中流体组成的变化；3) Lac Herbin金矿流体包裹体PTX性质、硫化物化学和同位素组成与金品位的关系，为金的沉积机制提供约束条件。

The long-term goal of my research program is to understand the sources, flow paths, chemical and isotopic exchange, and mixing histories of hydrothermal fluids circulating in the crust and that form hydrothermal deposits. In this Discovery Grant proposal, emphasis will be to characterise fluids and their pathways from metamorphic sources that form hydrothermal orogenic gold mineralization. These data enable reconstruction of the crustal hydrogeology of ancient hydrothermal systems to understand how these fluids formed important mineral resources. Parameters that control crustal-scale hydrothermal fluid flow are studied using sophisticated 3D numerical models that simulate transport and exchange between hydrothermal fluids and a rock matrix cut by discrete fractures. For the next five years of my long-term research program, I propose to carry an integrated study of orogenic gold mineralization from fluid flow paths, to sources, to localized precipitation of gold, comprised of three specific projects: 1) the crustal hydrogeology, at the scale of a large orogenic gold deposit (Sigma, Abitibi) to understand deposit-scale fluid flow patterns in relation to the district-scale fluid flow patterns; 2) the in situ stable isotope composition of coexisting quartz (O) and tourmaline (H, B, O, Sr) from orogenic gold veins to resolve the compositional variation of fluid composition during formation of orogenic gold deposits; 3) the fluid inclusion PTX properties and sulphide chemical and isotope composition in relation to gold grade at the Lac Herbin mine to provide constraints for gold deposition mechanisms.