气候变化领域集成服务门户(CCPortal): The Influence of Magma Mixing on the Composition of Andesite Magmas and Silicic Eruption Style

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DOI	10.1029/2020GL087439
	The Influence of Magma Mixing on the Composition of Andesite Magmas and Silicic Eruption Style
	Hodge K.F.; Jellinek A.M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:13
英文摘要	Although inhibited on established fluid mechanical grounds, extensive magma mixing can play a critical role in creating andesite magmas at volcanic arcs and triggering effusive or explosive volcanism. We use analog experiments, scaling theory, and thermodynamic modeling of natural volcanic systems to show that mechanical mixing is enhanced if an intruding magma crystallizes to acquire a yield strength. Mafic magmas intruding highly silicic reservoirs will fragment as crystal-sized blobs/enclaves to produce textural homogeneity at the outcrop scale and heterogeneity at the scale of individual crystals. Rapid degassing from these enclaves can favor the production of permeable magmatic foams that facilitate gas loss from the reservoir and effusive volcanism. Crystallizing magmas intruding similar composition reservoirs of comparable or smaller effective viscosity will fragment at scales approaching the dike width. Sluggish degassing and consequent volatile retention in the reservoir can enhance volatile exsolution in an erupting conduit and tendency for explosive volcanism. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Crystals; Degassing; Explosives; Fluid mechanics; Hydraulic structures; Submarine geophysics; Volcanoes; Crystallizing magma; Effective viscosity; Effusive volcanisms; Explosive volcanism; Mechanical mixing; Scaling theories; Thermodynamic model; Volcanic systems; Mixing; andesite; explosive volcanism; magma; outcrop; reservoir; volcanic eruption
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170149
作者单位	Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada
推荐引用方式 GB/T 7714	Hodge K.F.,Jellinek A.M.. The Influence of Magma Mixing on the Composition of Andesite Magmas and Silicic Eruption Style[J],2020,47(13).
APA	Hodge K.F.,&Jellinek A.M..(2020).The Influence of Magma Mixing on the Composition of Andesite Magmas and Silicic Eruption Style.Geophysical Research Letters,47(13).
MLA	Hodge K.F.,et al."The Influence of Magma Mixing on the Composition of Andesite Magmas and Silicic Eruption Style".Geophysical Research Letters 47.13(2020).