Zanon Vittorio, D'Auria Luca, Schiavi Federica, Cyrzan Klaudia, Pankhurst Matthew J
Instituto de Investigação em Vulcanologia e Avaliação de Riscos (IVAR), Universidade dos Açores, Rua Mãe de Deus, 9500-123 Ponta Delgada, Portugal.
Instituto Tecnológico y de Energías Renovables (ITER), 38600 Granadilla de Abona, Tenerife, Canary Islands, Spain.
Sci Adv. 2024 Feb 9;10(6):eadi4300. doi: 10.1126/sciadv.adi4300. Epub 2024 Feb 7.
Fluid inclusion microthermometry on olivines, clinopyroxenes, and amphiboles was used during a volcanic eruption, in combination with real-time seismic data and rapid petrographic observations, for petrological monitoring purposes. By applying this approach to the study of 18 volcanic samples collected during the eruption of Tajogaite volcano on La Palma Island (Canary Islands) in 2021, changes in the magma system were identified over time and space. Magma batches with distinct petrographic and geochemical characteristics emerged from source zones whose depth progressively increased from 27 to 31 kilometers. The rise of magma of deeper origin is attested by fluid inclusions made of N and CO, markers of mantle outgassing. Magma accumulation occurred over different durations at depths of 22 to 27 and 4 to 16 kilometers. Time-integrated magma ascent velocities (including ponding times) were estimated at between 0.01 and 0.1 meters per second. This method is cost-effective and quickly identifies changes in the magma system during an eruption, enhancing petrological monitoring procedures.
在一次火山喷发期间，对橄榄石、单斜辉石和角闪石进行了流体包裹体显微测温，并结合实时地震数据和快速岩相学观测，用于岩石学监测目的。通过将这种方法应用于对2021年在拉帕尔马岛（加那利群岛）塔约加伊特火山喷发期间采集的18个火山样本的研究，确定了岩浆系统随时间和空间的变化。具有不同岩相和地球化学特征的岩浆批次从源区涌出，源区深度从27公里逐渐增加到31公里。由氮气和一氧化碳组成的流体包裹体证明了更深源区岩浆的上升，氮气和一氧化碳是地幔脱气的标志。岩浆在22至27公里和4至16公里的深度上在不同时间段内发生聚集。时间积分岩浆上升速度（包括停滞时间）估计在每秒0.01至0.1米之间。这种方法具有成本效益，能在火山喷发期间快速识别岩浆系统的变化，增强了岩石学监测程序。
