Accomplishment-Based Renewal: Experimental Determination of the PVTX and Phase Equilibrium Properties of Aqueous Chloride Fluids at Magmatic-hydrothermal Conditions

基于成果的更新：岩浆-热液条件下氯化物水溶液的 PVTX 和相平衡性质的实验测定

• 批准号: 1624589
• 负责人: Robert Bodnar
• 金额: $ 47.79万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2019-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1624589&HistoricalAwards=false
• 关键词: Accomplishment; Based; Renewal; Experimental; Determination

Increasing world population, combined with an overall increase in global standard of living, requires an ever-increasing amount of resources to meet human demands. The Earth is the source of all the minerals, metals and other natural resources required to manufacture the products needed to sustain a modern technological society. Exploration models designed to discover new occurrences of minerals and metals are based on an understanding of the various physical, chemical and biological processes that lead to the accumulation of metals and other resources into economic concentrations. Most mineral and metal deposits are formed when heated fluids in the Earth's crust dissolve, transport and deposit metals to form ore deposits, and most of the ore-forming fluids are highly-saline brines containing various salts. The goal of this project is to develop a better understanding of the fundamental properties of saline fluids at temperature and pressure conditions appropriate for ore-forming systems. This information, in turn, will lead to development of better mineral exploration models and contribute to economic stability and prosperity and promote a more secure future by reducing dependence on external sources to provide the raw materials needed for technological and defense applications. The project will also provide training in state-of-the-art experimental and analytical techniques for several students and young researchers from diverse backgrounds. Most natural saline fluids in the Earth's crust are approximated by the H2O-NaCl-KCl-CaCl2-FeCl2 system. Previous work has shown that the physical and chemical behavior of saline fluids at elevated temperatures and pressures is highly dependent on the total salinity of the fluid as well as the ratios of the various major salt components in the fluid. In this project experiments will be conducted to determine the Pressure-Volume-Temperature-Composition (PVTX) and phase equilibrium properties of aqueous chloride fluids at magmatic-hydrothermal PTX conditions. Synthetic fluid inclusions containing fluids with various binary, ternary, quaternary and quinary compositions within this five-component system will be trapped at magmatic-hydrothermal PTX conditions. Phase boundaries (liquid-vapor curves and liquidi), critical points, and isochores (lines of constant density) will be determined using the synthetic fluid inclusion technique that has proven to be successful in numerous earlier studies. Empirical numerical recipes to estimate compositions of fluids in the various sub-systems based on microthermometric and microanalysis of natural fluid inclusions will be developed from the experimental data. These data provide the basis for interpretations of microthermometric data from natural fluid inclusions and provide feedstock for future studies to develop empirical numerical models describing the PVTX properties of hydrothermal fluids over the range of PTX conditions appropriate for crustal hydrothermal systems. The results of this project will lead to a better understanding of the phase equilibrium and PVTX behavior of ?real? magmatic-hydrothermal fluids, and provide a solid basis for developing more robust mineral exploration models based on data obtained from studies of fluid inclusions in natural systems.

增加世界人口，加上全球生活水平的总体增长，需要不断增加的资源来满足人类需求。地球是生产维持现代技术社会所需的产品所需的所有矿产，金属和其他自然资源的来源。旨在发现矿物质和金属新事件的勘探模型基于对各种物理，化学和生物学过程的理解，这些过程导致金属和其他资源积累到经济集中。当地壳中的加热流体溶解，运输和沉积金属形成矿石沉积时，大多数矿物质和金属沉积物都是形成的，大多数形成矿石的液体是含有各种盐的高盐水盐水。该项目的目的是更好地理解适合矿石形成系统的温度和压力条件下盐水的基本特性。反过来，这些信息将导致开发更好的矿物勘探模型，并促进经济稳定和繁荣，并通过减少对外部资源的依赖来提供技术和国防应用所需的原材料，从而促进更安全的未来。该项目还将为来自不同背景的几位学生和年轻研究人员提供最新的实验和分析技术培训。 H2O-NACL-KCL-CACL2-FECL2系统近似地球上的大多数天然盐水液。先前的工作表明，在升高温度和压力下盐水的物理和化学行为高度取决于流体的总盐度以及流体中各种主要盐成分的比率。在此项目中，将进行实验，以确定在岩浆 - 热热PTX条件下氯化水溶液的压力 - 温度组合（PVTX）和相平衡性能。该五组分系统中含有各种二元，三元，Quaternary和Quarity组成的液体的合成流体夹杂物将被困在岩浆 - 热热PTX条件下。相边界（液体蒸气曲线和液体），临界点和等距（恒定密度线）将使用合成液包容技术确定，该技术在众多早期研究中已被证明是成功的。根据实验数据将开发基于微热计量和自然流体夹杂物的微分析的各个子系统中流体组成的经验数值食谱。这些数据为从天然流体夹杂物中解释微热数据的解释提供了基础，并为未来的研究提供了原料，以开发经验数值模型，这些模型描述了适用于甲壳水热系统的PTX条件范围内的热液液的PVTX特性。该项目的结果将使人们更好地理解“真实”的相位平衡和PVTX行为？岩浆 - 热热流体，并根据自然系统中流体夹杂物的研究获得的数据为开发更健壮的矿物勘探模型提供了坚实的基础。