Experimental Studies of Ore-Forming Environments Using Synthetic Fluid Inclusions

要求提供资金，对适用于成矿环境的地球化学过程进行合成流体包裹体研究。合成流体包裹体将用于测定H2O-NaCl-KCl体系中流体在10 kbar和1000℃下的PVTX特性。本研究的成果将是描述H2O-NaCl-KCl的PVTX性质的计算机程序和图形，可用于解释从天然包裹体中获得的微观测温数据。第二项研究将调查天然流体包裹体对氢气增益/损失的影响。合成流体包裹体将在已知的fO2条件下制备，然后在已知但可变的fO2条件下重新平衡，以量化氢容量变化率作为温度、逸度梯度和矿物表面以下深度的函数。然后，这些信息将用于规划实验，以确定氢的增益/损失对以下方面的影响：(1)包裹体流体的形态和捕获后可能发生的变化；(2)包裹体水的氢（D/H）同位素组成；(3)在天然流体包裹体中常见的各种子矿物的溶解度。这些数据可用于估计天然流体包裹体经历的圈闭后历史（隆起路径）。

Funding is requested to conduct synthetic fluid inclusion studies of geochemical processes applicable to ore-forming environments. Synthetic fluid inclusions will be used to determine PVTX properties of fluids in the H2O-NaCl-KCl system to 10 kbars and 1000oC. The product of this study will be a computer program and graphics describing the PVTX properties of H2O-NaCl-KCl that can be used to interpret micro thermometric data obtained from natural inclusions. A second study will investigate the implications of hydrogen gain/loss by natural fluid inclusions. Synthetic fluid inclusions will be made at known fO2 conditions and then re- equilibrated at known but variable fO2 conditions in order to quantify the rate of hydrogen fucacity change as a function of temperature, fugacity gradient and depth below the mineral surface. This information will then be used to plan experiments to determine the effect of hydrogen gain/loss on (1) speciation of inclusion fluids and possible post-trapping changes, (2) the Hydrogen (D/H) isotopic composition of inclusion waters and (3) the solubility of various daughter minerals that are commonly observed in natural fluid inclusions. These data may then be used to estimate post-entrapment histories (uplift paths) experienced by natural fluid inclusions.