气候变化领域集成服务门户(CCPortal): Multiple, Coeval Silicic Magma Storage Domains Beneath the Laguna Del Maule Volcanic Field Inferred From Gravity Investigations

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DOI	10.1029/2020JB020850
	Multiple, Coeval Silicic Magma Storage Domains Beneath the Laguna Del Maule Volcanic Field Inferred From Gravity Investigations
	Trevino S.F.; Miller C.A.; Tikoff B.; Fournier D.; Singer B.S.
发表日期	2021
ISSN	21699313
卷号	126 期号:4
英文摘要	The rhyolite-producing Laguna del Maule volcanic field (LdMVF), Chile, has had numerous post-glacial eruptions that produced large explosions and voluminous lava flows. During the Holocene ∼60 m of surface uplift is recorded by paleo-shorelines of the fresh-water Laguna del Maule, with an inflation source near the Barrancas volcanic complex. Rhyolites from the Barrancas complex erupted over ∼14 ka including some of the youngest (1.4 ± 0.6 ka) lava flows in the field. New gravity data collected on the Barrancas complex reveals a residual gravity low (−6 mGal, “Barrancas anomaly”) that is distinct from the pronounced gravity low (−19 mGal; “Lake anomaly”) associated with present-day ground uplift to the northwest. Three-dimensional inversion of the Barrancas anomaly indicates the presence of a magma body with a maximum density contrast with the host rock of −250 kg/m3 centered at a depth of ∼3 km below surface. Nearby Miocene high-silica granites represent frozen remnants of highly evolved rhyolitic magma. Comparison of the densities measured from samples of these plutons with the geophysical model densities, and integration of thermodynamic modeling of silicic melt evolution, provide constraints on our interpretation. We propose a magma body, containing <30% melt phase and low volatile content, exists beneath Barrancas. The Barrancas and Lake gravity lows represent magma in different physical states, associated with past and present-day storage beneath LdMVF. The gravity model mirrors geochemical observations which independently indicate that at least two distinct rhyolites were generated and stored as discrete magma bodies within the broader LdMVF. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	density; geophysics; gravity; inversion; magma; volcano
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187186
作者单位	Department of Geoscience, University of Wisconsin–Madison, Madison, WI, United States; GNS Science, Wairakei Research Centre, Taupo, New Zealand; Mira Geoscience, Vancouver, BC, Canada
推荐引用方式 GB/T 7714	Trevino S.F.,Miller C.A.,Tikoff B.,et al. Multiple, Coeval Silicic Magma Storage Domains Beneath the Laguna Del Maule Volcanic Field Inferred From Gravity Investigations[J],2021,126(4).
APA	Trevino S.F.,Miller C.A.,Tikoff B.,Fournier D.,&Singer B.S..(2021).Multiple, Coeval Silicic Magma Storage Domains Beneath the Laguna Del Maule Volcanic Field Inferred From Gravity Investigations.Journal of Geophysical Research: Solid Earth,126(4).
MLA	Trevino S.F.,et al."Multiple, Coeval Silicic Magma Storage Domains Beneath the Laguna Del Maule Volcanic Field Inferred From Gravity Investigations".Journal of Geophysical Research: Solid Earth 126.4(2021).