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Revised conceptual model for maar-diatremes: Subsurface processes, energetics, and eruptive products

2012; Geological Society of America; Volume: 40; Issue: 12 Linguagem: Inglês

10.1130/g33411.1

1943-2682

Greg A. Valentine, James D. L. White,

Geological and Geochemical Analysis

Research Article| December 01, 2012 Revised conceptual model for maar-diatremes: Subsurface processes, energetics, and eruptive products Greg A. Valentine; Greg A. Valentine * 1Department of Geology, 411 Cooke Hall, University at Buffalo, Buffalo, New York 14260, USA *E-mail: gav4@buffalo.edu. Search for other works by this author on: GSW Google Scholar James D.L. White James D.L. White 2Geology Department, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand Search for other works by this author on: GSW Google Scholar Author and Article Information Greg A. Valentine * 1Department of Geology, 411 Cooke Hall, University at Buffalo, Buffalo, New York 14260, USA James D.L. White 2Geology Department, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand *E-mail: gav4@buffalo.edu. Publisher: Geological Society of America Received: 13 Mar 2012 Revision Received: 28 May 2012 Accepted: 07 Jun 2012 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2012 Geological Society of America Geology (2012) 40 (12): 1111–1114. https://doi.org/10.1130/G33411.1 Article history Received: 13 Mar 2012 Revision Received: 28 May 2012 Accepted: 07 Jun 2012 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Greg A. Valentine, James D.L. White; Revised conceptual model for maar-diatremes: Subsurface processes, energetics, and eruptive products. Geology 2012;; 40 (12): 1111–1114. doi: https://doi.org/10.1130/G33411.1 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 Diatremes are debris-filled structures beneath maars that result from many magma-water (phreatomagmatic) explosions during a monogenetic volcano's lifetime. A long-standing model requires deepening explosions, due to water table drawdown, that eject progressively deeper-seated country rock from the explosion sites, while the overlying diatreme and its surface crater widen due to subsidence. A revised model is proposed wherein explosions can take place at any level within a diatreme at a given time, most effectively venting material from near-surface explosions. Deep-seated country rock lithics in tephra deposits record stepwise vertical mixing of material by upward-directed debris jets and downward subsidence, rather than direct ejection from deep explosions. Juvenile and lithic clasts erupted during a given explosion may have had a complex history within the diatreme and need not directly reflect fragmentation or brecciation during the explosion that ejects them. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.