Origin of hydrothermal mineral deposits

我的研究计划的长期目标是了解在地壳中循环并形成热液矿床的热液流体的来源，流动路径，化学和同位素交换以及混合历史。在这个发现补助金提案中，重点将是从形成热液造山金矿化的变质源中提取流体及其路径。这些数据使古热液系统的地壳水文地质重建，以了解这些流体如何形成重要的矿产资源。控制地壳规模的热液流体流动的参数进行了研究，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。在今后五年的长期研究计划中，我建议对造山型金矿化进行从流体流动路径到来源再到金的局部沉淀的综合研究，具体包括三个方面：1）大型造山型金存款规模的地壳水文地质（Sigma，Abitibi）了解矿床规模的流体流动模式与地区规模的流体流动模式的关系; 2）石英（O）和电气石的原位稳定同位素组成（H，B，O，Sr），以解决造山型金矿形成过程中流体成分的变化; 3）流体包裹体PTX性质和硫化物化学及同位素组成与Lac Herbin矿金品位的关系，为金沉积机制提供了约束。

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.