DOI: 10.1016/j.epsl.2018.04.053
Scopus记录号: 2-s2.0-85047098846
论文题名: Dynamics of a powerful deep submarine eruption recorded in H2O contents and speciation in rhyolitic glass: The 2012 Havre eruption
作者: Mitchell S.J. ; McIntosh I.M. ; Houghton B.F. ; Carey R.J. ; Shea T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 494 起始页码: 135
结束页码: 147
语种: 英语
英文关键词: bubble resorption
; FTIR
; rehydration
; submarine volcanism
; volatile diffusivity
; water speciation
Scopus关键词: Fourier transform infrared spectroscopy
; Glass
; Stratigraphy
; Temperature
; Volcanoes
; bubble resorption
; Fourier transform infra reds
; FTIR
; Hydroxyl concentrations
; Micro Raman Spectroscopy
; rehydration
; Stratigraphic sequences
; Submarine volcanism
; Submarines
英文摘要: Constraining the syn-eruptive volatile contents of magmatic melt is critical to understanding the intensities and styles of deep submarine volcanic eruptions, for which direct observations are scarce. Quantifying residual magmatic water contents in volcanic glass is complicated by rehydration, i.e., late-stage addition of molecular water. The 2012 deep submarine silicic eruption of Havre volcano provides an unusual opportunity to quantify glass water contents from a recent, well-sampled stratigraphic sequence. Fourier-transform infrared and microRaman spectroscopy measurements of water concentration and water speciation across the Havre 2012 eruptive sequence reveal an unanticipated range of excess molecular water within pumice. This excess water requires rapid timescales of diffusion that are inconsistent with our current understanding of low temperature secondary rehydration in both subaerial and subaqueous eruptive products. Diffusion models applied to enrichment profiles at vesicle edges confirm that low temperature rehydration is an unlikely cause. We instead support higher temperature, syn-eruptive pumice rehydration by condensed magmatic water and seawater in a submarine plume. Hydroxyl concentrations suggest shallow quenching depths of Havre pumice hundreds of meters above the 900-meter-deep main vent. Our data also support the presence of a vapor-rich plume and consequent modification of ocean pressure above the vent. We combine this novel volatile data with textural information and cooling rate calculations to explore the conditions that would cause slower, shallow cooling of clasts from a deep submarine eruption. By exploring the physical conditions for the interaction between pumice and submarine plumes, we emphasize fundamental differences between subaerial and submarine clast-producing eruptions. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109837
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geology & Geophysics, University of Hawai'i at Mānoa, 1680 East-West Rd, Honolulu, HI 96822, United States; Department of Solid Earth Geochemistry, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka, Kanagawa, 237-0061, Japan; College of Science and Engineering, School of Natural Sciences, University of Tasmania, Tasmania, 7005, Australia
Recommended Citation:
Mitchell S.J.,McIntosh I.M.,Houghton B.F.,et al. Dynamics of a powerful deep submarine eruption recorded in H2O contents and speciation in rhyolitic glass: The 2012 Havre eruption[J]. Earth and Planetary Science Letters,2018-01-01,494