Development of a Numerical Model for the PVTX Properties of Na-K-Ca-Fe-C1 Solutions in Magmatic/Hydrothermal Ore Deposits

岩浆/热液矿床中 Na-K-Ca-Fe-C1 溶液 PVTX 特性数值模型的开发

• 批准号: 0125918
• 负责人: Robert Bodnar
• 金额: $ 33.65万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-01-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0125918&HistoricalAwards=false
• 关键词: Development; Numerical; Model; PVTX; Properties

BodnarEAR-0125918A three-year experimental study will be conducted to determine the temperature-pressure-composition (PTX) limits of fluid immiscibility over the temperature and pressure range appropriate for magmatic-hydrothermal ore deposits associated with shallow granitic magmas. The study will focus on fluid compositions in aqueous solutions containing Na, K, Ca, and Fe chlorides, starting with the less-complex sub-systems containing Na-K, Na-Ca, and Na-Fe chlorides. Samples of immiscible fluids will be trapped in situ using the synthetic fluid inclusion technique, and compositions of the fluids will be determined using standard microthermometric analytical techniques. The compositional data will be used to develop an empirical numerical model to predict P-T conditions attending magmatic-hydrothermal processes. The model will require only information that is easily obtainable during conventional microthermometric and/or microchemical analysis of fluid inclusions. The feasibility of the project has been documented by preliminary studies on the water-NaCl-KCl system. The data confirm that the synthetic fluid inclusions trap a representative sample of the fluid(s) present at experimental run conditions, and maintain these compositions during quenching to ambient laboratory conditions. Moreover, conventional microthermometric analysis of the coexisting liquid-rich and vapor-rich inclusions can be employed to determine the fluid compositions. Preliminary data for the water-NaCl-KCl system show that partitioning of sodium and potassium between coexisting liquid and vapor varies systematically with both temperature and pressure. Specifically, sodium partitioning into the liquid phase becomes less pronounced with increasing temperature and with decreasing pressure.

将进行一项为期三年的实验研究，以确定与浅部花岗质岩浆有关的岩浆热液矿床在适当温度和压力范围内的流体不渗透性的温度-压力-成分（PTX）极限。 该研究将集中在流体成分的水溶液中含有钠，钾，钙，铁氯化物，从较不复杂的子系统含有钠钾，钠钙，钠铁氯化物。 将使用合成流体包裹体技术原位捕获不混溶流体样品，并使用标准微量测温分析技术确定流体的成分。 成分数据将被用来开发一个经验的数值模型来预测P-T条件参加岩浆热液过程。 该模型只需要在常规的流体包裹体显微测温和/或显微化学分析过程中容易获得的信息。 该项目的可行性已通过对水-NaCl-KCl系统的初步研究得到证明。 数据证实，合成流体包裹体捕获在实验运行条件下存在的流体的代表性样品，并且在淬火至环境实验室条件期间保持这些组成。 此外，还可以利用常规的富液和富气包裹体显微测温分析来确定流体成分。 水-NaCl-KCl系统的初步数据表明，钠和钾在共存的液体和蒸汽之间的分配随温度和压力系统地变化。 具体而言，钠分配到液相中变得不太明显，随着温度的升高和压力的降低。