Thermodynamics of Aluminous Amphiboles

铝角闪石的热力学

• 批准号: 9628203
• 负责人: Bernard Evans
• 金额: $ 3.98万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-08-01 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9628203&HistoricalAwards=false
• 关键词: Thermodynamics; Aluminous; Amphiboles

9628203 Evans This proposal is to continue work on the thermodynamic properties of quadrilateral amphiboles and includes three tasks. (1) Complete the research and manuscript on the dependence of the optical properties of the ferromagnesian amphiboles on the composition and ordering states of natural and heat-treated samples. (2) Conduct single crystal XRD refinements on room temperature and heat-treated natural gedrites to determine the effects of temperature, Fe/Mg, and tschermaks and edenite exchanges on long-range ordering. (3) Initial heat-treatment and single-crystal study of natural hornblendes from amphibolites. The goal of this project is to calibrate the thermodynamic properties of aluminous, calcic and ferromagnesian amphiboles with compositions typical of those found in metamorphic and igneous assemblages. These properties will allow the PI's to calculate the theoretical phase diagrams involving amphiboles and other minerals for which they have previously developed internally consistent thermodynamic models. The PI's tend to incorporate the models developed in the course of this proposal into the software package MELTS, thereby allowing the modeling of amphibole crystallization in magmatic and subsolidus systems.

9628203埃文斯这项提议是继续研究四边形角闪石的热力学性质，包括三项任务。(1)完成了铁镁角闪石的光学性质与天然样品和热处理样品的组成和有序状态的关系的研究和手稿。(2)对常温和热处理后的天然格子石进行了单晶X射线衍射精炼，考察了温度、铁镁比、硅藻土和埃迪石交换对长程有序化的影响。(3)角闪岩中天然角闪石的初步热处理和单晶研究。该项目的目标是用变质岩和火成岩组合中发现的典型成分来校准铝、钙和铁镁角闪石的热力学性质。这些性质将允许PI计算涉及角闪石和其他矿物的理论相图，他们之前已经为这些矿物建立了内部一致的热力学模型。PI倾向于将在本建议过程中开发的模型合并到软件包Melts中，从而允许对岩浆和底固相线系统中的角闪石结晶进行建模。