DOI: 10.1016/j.epsl.2020.116139
论文题名: Integrated constraints on explosive eruption intensification at Santiaguito dome complex, Guatemala
作者: 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.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 536 语种: 英语
中文关键词: 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
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) Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165330
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Wallace P.A.,Lamb O.D.,De Angelis S.,et al. Integrated constraints on explosive eruption intensification at Santiaguito dome complex, Guatemala[J]. Earth and Planetary Science Letters,2020-01-01,536