Volatile Migration in Silicic Lavas

内生火山碎屑流可能会在没有警告的情况下出现， 相对干燥的熔岩的远端部分， 说明挥发物浓度很高 该项目将是一个 研究挥发物迁移的过程，并将 涉及以下活动：1）冷却的建模 量化结晶过程的熔岩流， 角砾化作用和泡状作用; 2）测量分布， 挥发物的同位素特征，以及绘制泡状结构 在活跃的英安岩圆顶在圣海伦斯，马拉吉托，和圣。 奥古斯丁; 3）表征的形态和能量 灰岩中微碎屑的扫描电镜观察及变形 实验，以评估在挥发性运输的可能作用。 PI将参与Novarupta的实地采集、绘图 圆顶，实验研究和结果的合成。

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.