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.

BodnarEAR-0125918 将进行为期三年的实验研究，以确定在适合与浅层花岗岩岩浆相关的岩浆热液矿床的温度和压力范围内流体不混溶性的温度-压力-成分（PTX）限制。 该研究将重点关注含有氯化钠、氯化钾、氯化钙和氯化铁的水溶液中的流体成分，从含有氯化钠、氯化钾、氯化钙和氯化铁的不太复杂的子系统开始。 将使用合成流体包裹体技术将不混溶流体的样品捕获在原位，并使用标准的显微测温分析技术来确定流体的成分。 成分数据将用于开发经验数值模型来预测参与岩浆热液过程的 P-T 条件。 该模型仅需要在流体包裹体的传统显微测温和/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-氯化钠-氯化钾系统的初步研究得到证实。 数据证实，合成流体夹杂物捕获了实验运行条件下存在的流体的代表性样品，并在淬火至环境实验室条件期间保持这些成分。 此外，可以采用对共存的富含液体和富含蒸气的夹杂物的常规显微测温分析来确定流体成分。 水-氯化钠-氯化钾系统的初步数据表明，钠和钾在共存液体和蒸气之间的分配随着温度和压力的变化而系统地变化。 具体而言，随着温度升高和压力降低，钠分配到液相中变得不那么明显。