Volatile Migration in Silicic Lavas

硅质熔岩中的挥发性迁移

• 批准号: 8817458
• 负责人: Jonathan Fink
• 金额: $ 8.94万
• 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: 1989
• 资助国家: 美国
• 起止时间: 1989-01-01 至 1991-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8817458&HistoricalAwards=false
• 关键词: Volatile; Migration; Silicic; Lavas

Endogenic pyroclastic flows may emerge without warning from distal portions of advancing, relatively dry silicic lava, suggesting concentration of volatiles. This project will be an investigation of processes by which volatiles migrate, and will involve the following activities: 1) Modeling of the cooling of a silicic lava flow to quantify processes of crystallization, brecciation and vesiculation; 2) measuring distribution and isotopic signatures of volatiles, and mapping vesicular textures in active dacite domes at St. Helens, Santiaguito, and St. Augustine; 3) characterizing the morphology and energetics of microcracis in silicic lavas through SEM and deformation experiments to evaluate the possible role in volatile transport. The PI will be engaged in field collecting, mapping on Novarupta dome, experimental studies, and synthesis of results.

内生火山碎屑流可能会在没有任何警告的情况下从前进的、相对干燥的硅质熔岩的远端部分出现，表明挥发物的浓度。 该项目将研究挥发物迁移的过程，并将涉及以下活动： 1）对硅质熔岩流的冷却进行建模，以量化结晶、角砾化和发泡的过程； 2) 测量挥发物的分布和同位素特征，并绘制圣海伦斯、圣地亚哥和圣奥古斯丁活跃英安岩圆顶中的气泡结构图； 3）通过SEM和变形实验表征硅质熔岩中微裂纹的形态和能量，以评估其在挥发物迁移中的可能作用。 PI 将从事实地收集、诺瓦鲁普塔圆顶测绘、实验研究和结果综合。