Title: Unusual fluidal behavior of a silicic magma during fragmentation in a deep subaqueous eruption, Havre volcano, southwestern Pacific Ocean
Abstract: Research Article| March 22, 2019 Unusual fluidal behavior of a silicic magma during fragmentation in a deep subaqueous eruption, Havre volcano, southwestern Pacific Ocean A.P. Murch; A.P. Murch 1Department of Geology, University of Otago, Dunedin 9054, New Zealand Search for other works by this author on: GSW Google Scholar J.D.L. White; J.D.L. White 1Department of Geology, University of Otago, Dunedin 9054, New Zealand Search for other works by this author on: GSW Google Scholar R.J. Carey R.J. Carey 2Centre for Ore Deposit and Earth Sciences (CODES) and School of Natural Sciences, University of Tasmania, Hobart, Tasmania 7001, Australia Search for other works by this author on: GSW Google Scholar Geology (2019) 47 (5): 487–490. https://doi.org/10.1130/G45657.1 Article history received: 30 Sep 2018 rev-recd: 06 Mar 2019 accepted: 07 Mar 2019 first online: 22 Mar 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation A.P. Murch, J.D.L. White, R.J. Carey; Unusual fluidal behavior of a silicic magma during fragmentation in a deep subaqueous eruption, Havre volcano, southwestern Pacific Ocean. Geology 2019;; 47 (5): 487–490. doi: https://doi.org/10.1130/G45657.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search ABSTRACT Magma responds to applied stresses in either a viscous or elastic manner, depending on the time scales over which strain is accommodated. For silicic magmas, high strain rates of explosive volcanism cause brittle fragmentation and produce abundant small particles (ash). The A.D. 2012 Havre (Kermadec arc, southwestern Pacific Ocean) eruption at ∼900 m water depth deposited a unit of silicic ash with features indicative of syn- and/or post-fragmentation viscous deformation. Viscously deformed ash makes up 3%–35% of the two main ash subunits, S1 and S2, with the remaining ash formed by brittle fragmentation. Viscous behavior of melt during production of fine ash is unexpected for the silicic Havre magma, and for the high strain rates typical of fine fragmentation. The occurrence together of viscous and brittle ash grains suggests local and/or short-term variations in eruption conditions. We infer an explosive eruption mechanism modified by magma-water interaction, during which multi-source steam-veiled fragmentation sites permitted rapid viscous deformation of ash prior to contact with water. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 2019
Publication Date: 2019-03-22
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 13
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