The hydrothermal system at Soufriere Hills Volcano, Montserrat (West Indies): Characterization and role in the on‐going eruption
The hydrothermal system at Soufriere Hills Volcano, Montserrat (West Indies): Characterization and role in the on‐going eruption
复制标题
蒙特塞拉特岛（西印度群岛）苏弗里耶尔山火山的热液系统：特征及其在持续喷发中的作用
DOI：
10.1029/98gl00985
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
M. Semet
中科院分区：
文献类型：
--
作者：
G. Boudon;B. Villemant;J. Komorowski;P. Ildefonse;M. Semet
对来自活跃热液区的蚀变火山产物、1995年活动的潜水火山灰以及来自旧青山圆顶和现在（1995-97年）圆顶的碎片进行了矿物学、显微结构和地球化学研究。热液系统的矿物组合（主要是硅多晶型物）是高硫化系统上部蚀变带的典型特征。挥发性和移动的元素化学没有证据表明热液系统和喷发的岩浆之间的相互作用。这些结果表明，正在进行的喷发管道与热液系统隔离，这是由于气相输送的二氧化硅沉淀，这大大减少了岩浆通过围岩的脱气。
Mineralogical, microtextural and geochemical studies have been performed on altered volcanic products from active hydrothermal areas, on phreatic tephra from the 1995 activity and on fragments from older Castle Peak dome and the present (1995–97) dome. The mineral assemblages of the hydrothermal system (primarily silica‐polymorphs) are typical of the upper alteration zone of a high sulfidation system. Volatile and mobile elements chemistry show no evidence of interaction between the hydrothermal system and erupting magmas. These results suggest that the on‐going eruption conduits are isolated from the hydrothermal system due to precipitation of vapor transported silica which drastically reduces the magma degassing through country rocks.