Amphiboles as Sensors of Water Activity and Oxygen Fugacity in Melts

角闪石作为熔体中水活度和氧逸度传感器

• 批准号: 9614325
• 负责人: Richard Hervig
• 金额: $ 6.91万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-01-01 至 1999-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9614325&HistoricalAwards=false
• 关键词: Amphiboles; Sensors; Water; Activity; Oxygen

9614325 Hervig This project will test two hypotheses: (1) that OH content in amphiboles, with constant Fe3+/Fe2+, is a function of the H2O activity in the system, and (2) that the oxygen content of the X-site of amphiboles is related to fO2 in melts. A corollary hypotheses is that amphiboles record volatile activity in a way that can be recovered by micro-analysis. The major elements, halogens, and H content of amphiboles and co-existing melt, will be determined using a combination of electron probe and secondary ion mass spectrometry micro-analysis. The investigators will use samples from existing melting experiments.

小行星9614325 该项目将检验两个假设：（1）角闪石中的OH含量（Fe ~（3+）/Fe ~（2+）为常数）是系统中H_2O活度的函数，以及（2）角闪石X位的氧含量与熔体中的fO_2有关。 一个必然的假设是，角闪石记录挥发性活动的方式，可以恢复微观分析。 角闪石和共存熔体的主要元素、卤素和H含量将使用电子探针和二次离子质谱显微分析相结合来确定。 研究人员将使用现有熔化实验的样本。