The Behaviour of Metals in Magmatic-Hydrothermal Systems

我的研究计划集中在了解岩浆-热液系统中浓缩金属的过程。假设源于现场观测，然后从实验数据(例如，溶解度和分配数据)进行约束。这些方法的迭代导致了标准的制定，以确定哪种岩浆或热液过程或过程组合负责将金属浓缩到经济水平。 目前的建议由五个项目组成，涉及岩浆-热液系统的各个方面：i)确定磷对熔体中金属溶解度的作用；ii)评价磷灰石作为反映熔体中金属浓度的窗口；iii)确定高场强元素和稀土元素的流体-熔体分配系数，并具体评价氟在稀有金属迁移中的作用；iv)建立分析黄铁矿中痕量元素的分析方法，从微米到100‘S纳米量级，并确定Au和As在黄铁矿中的溶解度之间的相互关系；(V)评估是否可以用铌钽矿的结构状态来评价伟晶岩或花岗岩熔体的过冷程度。每个项目都将单独有助于我们对岩浆-热液系统中金属的基本理解，并共同建立一个全面的模型，解释不同组的金属如何通过不同的机制浓缩。

My research program is centered on understanding the processes that concentrate metals in magmatic-hydrothermal systems. Hypotheses originate from field observations, which are then constrained from experimental data, e.g., solubility and partition data. The iteration of these approaches leads to the development of criteria for recognizing which magmatic or hydrothermal process, or combination of processes, are responsible for concentrating metals to economic levels. The current proposal consists of five projects that address various aspects of magmatic-hydrothermal systems: i) determine the role of phosphorous on metal solubility in melts; ii) evaluate apatite as a window to metal concentrations in melts; iii) determine fluid-melt partition coefficients of high field strength elements and rare earth elements and specifically evaluate the role of fluorine in rare-metal transport; iv) develop the analytical protocol for analyzing trace elements in pyrite at the scale of microns to 100's of nanometers and determine the inter-relationship between Au and As solubility in pyrite, and; v) to evaluate whether the structural state of columbite-tantalite can be used to evaluate the degree of undercooling of pegmatite or granite melts. Each project will individually contribute to our fundamental understand of metals in magmatic-hydrothermal systems, and collectively will build toward a comprehensive model that explains how different groups of metals are concentrated by different mechanisms.