Origin of hydrothermal fluids

* 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5年计划中，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。在今后五年的长期研究计划中，我建议从流体流动路径、来源、金的局部沉淀等方面对造山带金矿化进行综合研究，包括三个尺度：1）地壳水文地质，在大型造山带金存款（Sigma-Lamaque，Abitibi）的尺度上了解矿床尺度的流体流动模式。控制地壳尺度的热液流体流动的参数是使用复杂的三维数值模型来研究的，该模型模拟了热液流体与被离散裂缝切割的岩石基质之间的输运和交换; 2）含金流体的来源和起源，使用来自世界级Éléonore矿的金矿化的稳定和放射性同位素组成，该矿是詹姆斯湾地区的一个大型变质沉积物型造山金存款;（3）利用二次离子质谱（西姆斯）原位测量造山带金矿脉中石英（O）和电气石（H，B，O，Sr）的稳定同位素组成和放射性同位素组成，研究造山带金矿形成过程中流体组成的变化。

***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.