Rise of the base of the gas hydrate zone since the last glacial recorded by rock magnetism

Abstract

Research Article| February 01, 2006 Rise of the base of the gas hydrate zone since the last glacial recorded by rock magnetism Robert J. Musgrave; Robert J. Musgrave 1School of Geosciences, Monash University, Clayton, VIC 3800, Australia Search for other works by this author on: GSW Google Scholar Nathan L. Bangs; Nathan L. Bangs 2University of Texas, Institute for Geophysics, 4412 Spicewood Springs Road, Austin, Texas 78759, USA Search for other works by this author on: GSW Google Scholar Juan Cruz Larrasoaña; Juan Cruz Larrasoaña 3Laboratori de Paleomagnetisme, Consejo Superior de Investigaciones Científicas, Universitat de Barcelona, Institut de Ciències de la Tierra "Jaume Almera," 08028 Barcelona, Spain Search for other works by this author on: GSW Google Scholar Eulàlia Gràcia; Eulàlia Gràcia 4Centre Mediterrani d'Investigacions Marines i Ambientals, Unitat de Tecnologia Marina, Consejo Superior de Investigaciones Científicas, Passeig Marítim de la Barceloneta, 37-49, 08003 Barcelona, Spain Search for other works by this author on: GSW Google Scholar Jennifer A. Hollamby; Jennifer A. Hollamby 5La Trobe University, PALM Laboratory, Bundoora, VIC 3086, Australia Search for other works by this author on: GSW Google Scholar Marta E. Vega Marta E. Vega 5La Trobe University, PALM Laboratory, Bundoora, VIC 3086, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Robert J. Musgrave 1School of Geosciences, Monash University, Clayton, VIC 3800, Australia Nathan L. Bangs 2University of Texas, Institute for Geophysics, 4412 Spicewood Springs Road, Austin, Texas 78759, USA Juan Cruz Larrasoaña 3Laboratori de Paleomagnetisme, Consejo Superior de Investigaciones Científicas, Universitat de Barcelona, Institut de Ciències de la Tierra "Jaume Almera," 08028 Barcelona, Spain Eulàlia Gràcia 4Centre Mediterrani d'Investigacions Marines i Ambientals, Unitat de Tecnologia Marina, Consejo Superior de Investigaciones Científicas, Passeig Marítim de la Barceloneta, 37-49, 08003 Barcelona, Spain Jennifer A. Hollamby 5La Trobe University, PALM Laboratory, Bundoora, VIC 3086, Australia Marta E. Vega 5La Trobe University, PALM Laboratory, Bundoora, VIC 3086, Australia Publisher: Geological Society of America Received: 29 Jun 2005 Revision Received: 21 Oct 2005 Accepted: 22 Oct 2005 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2006) 34 (2): 117–120. https://doi.org/10.1130/G22008.1 Article history Received: 29 Jun 2005 Revision Received: 21 Oct 2005 Accepted: 22 Oct 2005 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Robert J. Musgrave, Nathan L. Bangs, Juan Cruz Larrasoaña, Eulàlia Gràcia, Jennifer A. Hollamby, Marta E. Vega; Rise of the base of the gas hydrate zone since the last glacial recorded by rock magnetism. Geology 2006;; 34 (2): 117–120. doi: https://doi.org/10.1130/G22008.1 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 Gas hydrate, a clathrate of methane and water widespread on continental margins, has been implicated as a trigger of climate change and submarine slides as a result of methane release when the base of its stability zone moves upward rapidly. Direct tests of these hypotheses are made difficult by the ephemeral record of gas hydrate in sediment. In places, a seismic reflector (double bottom simulating reflector, BSR) appears to mark the old base of the gas hydrate layer, but the occurrence of this feature is patchy and its interpretation is controversial. Microbial activity is stimulated in the presence of gas hydrate, and results in the production of magnetic iron sulfides; the base of the gas hydrate interval is marked by a sharp reduction in the magnetic hysteresis parameter DJH. At Hydrate Ridge on the Cascadia margin, sampled during Ocean Drilling Program Leg 204, this signature occurs between 20 and 65 m below the present-day base of the gas hydrate zone, at a depth consistent with predictions for the base of gas hydrate stability given water depths and bottom-water temperatures appropriate for the last glacial maximum. Seismic evidence for a double BSR over part of Hydrate Ridge corroborates the rock magnetic interpretation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.