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首页> 外文期刊>Journal of Volcanology and Geothermal Research >The volcanic ash record of shallow magma intrusion and dome emplacement at Nevados de Chilian Volcanic complex, Chile
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The volcanic ash record of shallow magma intrusion and dome emplacement at Nevados de Chilian Volcanic complex, Chile

机译：智利Nevados de Chilian Volcanic Volcanic Valcan Company的浅岩体入侵与圆顶展出的火山灰录像

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Volcanoes are often monitored by geophysical and geochemical instruments that aim to track and anticipate their eruptive activity. However, assessment of the state of the volcano at any given time, and its evolution towards eruption or change in eruptive activity is notoriously difficult. Once explosive activity has begun, the study of volcanic ash can provide crucial insights on whether the activity is mainly driven by the hydrothermal system, shallow gas accumulation, or/and a new stalled intrusion close to the surface. We present the results of a study of ash componentry from part of the current volcanic crisis that started in December 2015 at Nevados de Chillan Volcanic complex (Chile) which we integrate with seismic and visual data. We identified three main stages: (i) an early one that lasted for about a year and includes two months of increased seismicity and significant amount of juvenile ash fragments, and thus suggesting some explosions were fed by a shallow magma intrusion. (ii) A second one which lasted for about six months with cycles of quiescence and explosions, and a predominance of lithic particles in the ash, suggesting that the explosions were probably driven by the dynamics in the upper part of the system, including shallow gas accumulation or/and the hydrothermal system, rather than by fresh magma intrusion. (iii) Finally, after about two years of unrest and intermittent explosions, seismicity increased again and the ash became dominated by juvenile particles, and led to the extrusion of a dome. The timing and sequence of events that we report is broadly similar to other volcanoes that have produced dome eruptions such as Soufriere Hills (Montserrat), Unzen (Japan) and Sinabung (Indonesia). Our study highlights the usefulness of integration of volcanic ash studies with other monitoring data and importance of integration of many case studies to gain a more comprehensive understanding of the processes and evolution of dome-forming eruptions. (C) 2021 The Author(s). Published by Elsevier B.V.
机译：火山通常由地球物理和地球化学仪器监控，该工具旨在跟踪和预测其爆发活动。然而，在任何特定时间内对火山的状态进行评估，并且其对爆发活动的爆发或变化的演变是众所周知的。一旦爆炸活动开始，火山灰的研究可以为活动提供关键的见解，了解活动是否主要由水热系统，浅气体积聚或/以及靠近表面的新的停滞侵入性。我们从2015年12月开始的当前火山危机的一部分在尼沃多斯·德·奇兰火山复合体（智利）中，展示了灰分成分的研究结果，我们与地震和视觉数据集成。我们确定了三个主要阶段：（i）持续大约一年的早期阶段，包括两个月增加的地震性和大量的少年灰分碎片，因此提出了一些爆炸，通过浅岩浆侵入来喂食一些爆炸。 （ii）（ii）持续约六个月的第二个静态和爆炸循环，以及灰中的岩石颗粒的优势，这表明爆炸可能是由系统上部的动态驱动的，包括浅气体积累或/和水热系统，而不是通过新鲜岩浆侵入。 （iii）最后，经过大约两年的动乱和间歇性的爆炸，地震性再次增加，灰烬由少年粒子占主导地位，并导致圆顶的挤出。我们报告的事件的时间和序列与其他产生圆顶爆发的火山相似，例如Soufriere Hills（Montserrat），Unzen（日本）和Sinabung（印度尼西亚）。我们的研究突出了火山灰研究与其他监测数据一体化的有用性和许多案例研究的重要性，以更全面地了解穹顶形成爆发的过程和演变。 （c）2021提交人。 elsevier b.v出版。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2021年第9期|107308.1-107308.15|共15页
  • 作者

    Benet Damia; Costa Fidel; Pedreros Gabriela; Cardona Carlos;

  • 作者单位

    Nanyang Technol Univ Asian Sch Environm Singapore Singapore|Nanyang Technol Univ EOS Singapore Singapore;

    Nanyang Technol Univ Asian Sch Environm Singapore Singapore|Nanyang Technol Univ EOS Singapore Singapore;

    Serv Nacl Geol & Min Observ Vulcanol Andes Sur Temuco Chile;

    Serv Nacl Geol & Min Observ Vulcanol Andes Sur Temuco Chile;

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