Origin of hydrothermal fluids

我的研究计划的长期目标是了解在地壳中循环的热液流体的来源、流动路径、化学和同位素交换以及混合历史，这些流体形成热液矿床。在这份探索基金的5年计划中，重点将是描述形成热液造山带金矿化的变质来源的流体及其路径。这些数据能够重建古代热液系统的地壳水文地质，以了解这些流体是如何形成重要的矿产资源的。在我未来五年的长期研究计划中，我计划对造山型金矿化进行从流体流动途径到来源，再到金的局部沉淀的综合研究，包括三个尺度：1)地壳水文地质学，在大型造山型金矿床(Sigma-Lamaque，Abitibi)尺度上了解矿床尺度的流体流动模式。利用复杂的三维数值模型研究了控制地壳规模热液流动的参数，这些模型模拟了热液流体与离散断裂切割的岩石基质之间的输运和交换；2)利用世界级的L金矿矿的稳定的和放射性成因的同位素组成，研究了含金流体的来源和来源；3)利用造山金矿脉的SIMS，现场测量了共存的石英(O)和电气石(H，B，O，Sr)的稳定的放射性同位素组成，以解决造山金矿形成过程中流体成分的变化。

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 5-year 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. 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 scales: 1) the crustal hydrogeology, at the scale of a large orogenic gold deposit (Sigma-Lamaque, Abitibi) to understand deposit-scale fluid flow patterns. 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; 2) source and origin of auriferous fluids using the stable and radiogenic isotope composition of gold mineralization from the world-class éléonore Mine, a large, meta-sediment hosted orogenic gold deposit in the James Bay region; 3) stable and radiogenic isotope composition of coexisting quartz (O) and tourmaline (H, B, O, Sr) will be measured in situ using the SIMS from orogenic gold veins to resolve the compositional variation of fluid composition during formation of orogenic gold deposits.