Flow-to-fracture transition in a volcanic mush plug may govern normal eruptions at Stromboli

Suckale J.; Keller T.; Cashman K. V.Persson P. -O.

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Flow-to-fracture transition in a volcanic mush plug may govern normal eruptions at Stromboli

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Stromboli is a model volcano for studying eruptions driven by degassing. The current paradigm posits that Strombolian eruptions represent the bursting of gas slugs ascending through melt-filled conduits, but petrological observations show that magma at shallow depth is crystalline enough to form a three-phase plug consisting of crystals, bubbles, and melt. We combine a 1-D model of gas flushing a crystalline mush with a 3-D stress model. Our results suggest that localized gas segregation establishes hot conduits of mobile magma within a stagnant plug. The plug is prone to tensile failure controlled by gas overpressure and tectonic stress, with failure most likely beneath the observed vent locations. We hence argue that Strombolian eruptions are related to plug failure rather than flow. Our proposed three-phase model of the shallow plumbing system may provide a promising framework for integrating geophysical, petrological, and morphological observations at Stromboli and in open-system volcanism more generally.

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《Geophysical Research Letters》 |2016年第23期|12071-12081|共11页
作者
Suckale J.; Keller T.; Cashman K. V.Persson P. -O.;
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作者单位

Stanford Univ, Dept Geophys, Stanford, CA 94305 USA;

Univ Bristol, Sch Earth Sci, Bristol, Avon, England;

Univ Calif Berkeley, Dept Math, Berkeley, CA 94720 USA;

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正文语种英语
中图分类地球物理学;
关键词
Stromboli volcano; Strombolian eruptions; slug; plug; three-phase flow; explosive basaltic volcanism;

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Flow-to-fracture transition in a volcanic mush plug may govern normal eruptions at Stromboli

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