气候变化领域集成服务门户(CCPortal): Integrated constraints on explosive eruption intensification at Santiaguito dome complex, Guatemala

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DOI	10.1016/j.epsl.2020.116139
	Integrated constraints on explosive eruption intensification at Santiaguito dome complex, Guatemala
	Wallace P.A.; Lamb O.D.; De Angelis S.; Kendrick J.E.; Hornby A.J.; Díaz-Moreno A.; González P.J.; von Aulock F.W.; Lamur A.; Utley J.E.P.; Rietbrock A.; Chigna G.; Lavallée Y.
发表日期	2020
ISSN	0012821X
卷号	536
英文摘要	Protracted volcanic eruptions may exhibit unanticipated intensifications in explosive behaviour and attendant hazards. Santiaguito dome complex, Guatemala, has been characterised by century-long effusion interspersed with frequent, small-to-moderate (<2 km high plumes) gas-and-ash explosions. During 2015–2016, explosions intensified generating hazardous ash-rich plumes (up to 7 km high) and pyroclastic flows. Here, we integrate petrological, geochemical and geophysical evidence to evaluate the causes of explosion intensification. Seismic and infrasound signals reveal progressively longer repose intervals between explosions and deeper fragmentation levels as the seismic energy of these events increased by up to four orders of magnitude. Evidence from geothermobarometry, bulk geochemistry and groundmass microlite textures reveal that the onset of large explosions was concordant with a relatively fast ascent of a deeper-sourced (∼17–24 km), higher temperature (∼960–1020 °C) and relatively volatile-rich magma compared to the previous erupted lavas, which stalled at ∼2 km depth and mingled with the left-over mush that resided beneath the pre-2015 lava dome. We interpret that purging driven by the injection of this deep-sourced magma disrupted the long-term activity, driving a transition from low energy shallow shear-driven fragmentation, to high energy deeper overpressure-driven fragmentation that excavated significant portions of the conduit and intensified local volcanic hazards. Our findings demonstrate the value of multi-parametric approaches for understanding volcanic processes and the triggers for enigmatic shifts in eruption style, with the detection of vicissitudes in both monitoring signals and petrological signatures of the eruptive products proving paramount. © 2020 The Author(s)
关键词	effusive-explosive transitions magma ascent microlites Santiaguito seismicity volcanic ash
英文关键词	Domes; Explosions; Explosives; Gasoline; Geochemistry; Hazards; Petrology; Seismology; Textures; Magma ascents; Microlites; Santiaguito; seismicity; Volcanic ash; Volcanoes; dome; explosive volcanism; geochemistry; integrated approach; magma; petrology; seismicity; volcanic ash; volcanic eruption; Guatemala [Central America]; Quezaltenango; Santiaguito
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202952
作者单位	Department of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool, L69 3GP, United Kingdom; Department of Geological Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States; Earth and Environmental Sciences, Ludwig-Maximilians-Universität (LMU), Theresienstrasse 41/III, Munich, 80333, Germany; Volcanology Research Group, Department of Life, Earth Sciences, IPNA-CSIC, La Laguna, Tenerife, Spain; Geophysical Institute, Karlsruhe Institute of Technology, Karlsruhe, Germany; Instituto Nacional de Sismologia, Vulcanologia, Meteorologia, e Hydrologia (INSIVUMEH), Guatemala City, Guatemala
推荐引用方式 GB/T 7714	Wallace P.A.,Lamb O.D.,De Angelis S.,et al. Integrated constraints on explosive eruption intensification at Santiaguito dome complex, Guatemala[J],2020,536.
APA	Wallace P.A..,Lamb O.D..,De Angelis S..,Kendrick J.E..,Hornby A.J..,...&Lavallée Y..(2020).Integrated constraints on explosive eruption intensification at Santiaguito dome complex, Guatemala.Earth and Planetary Science Letters,536.
MLA	Wallace P.A.,et al."Integrated constraints on explosive eruption intensification at Santiaguito dome complex, Guatemala".Earth and Planetary Science Letters 536(2020).