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Temporal and spatial evolution of a gas hydrate–bearing accretionary ridge on the Oregon continental margin

1999; Geological Society of America; Volume: 27; Issue: 10 Linguagem: Inglês

10.1130/0091-7613(1999)027 2.3.co;2

1943-2682

A. M. Tréhu, Marta E. Torres, Gregory F. Moore, Erwin Suess, Gerhard Bohrmann,

Geology and Paleoclimatology Research

Research Article| October 01, 1999 Temporal and spatial evolution of a gas hydrate–bearing accretionary ridge on the Oregon continental margin Anne M. Tréhu; Anne M. Tréhu 1College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331-5503, USA Search for other works by this author on: GSW Google Scholar Marta E. Torres; Marta E. Torres 1College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331-5503, USA Search for other works by this author on: GSW Google Scholar Gregory F. Moore; Gregory F. Moore 2School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822, USA Search for other works by this author on: GSW Google Scholar Erwin Suess; Erwin Suess 3GEOMAR, Research Center for Marine Geosciences, Kiel, Germany Search for other works by this author on: GSW Google Scholar Gerhard Bohrmann Gerhard Bohrmann 3GEOMAR, Research Center for Marine Geosciences, Kiel, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Anne M. Tréhu 1College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331-5503, USA Marta E. Torres 1College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon 97331-5503, USA Gregory F. Moore 2School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822, USA Erwin Suess 3GEOMAR, Research Center for Marine Geosciences, Kiel, Germany Gerhard Bohrmann 3GEOMAR, Research Center for Marine Geosciences, Kiel, Germany Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (10): 939–942. https://doi.org/10.1130/0091-7613(1999)027 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Anne M. Tréhu, Marta E. Torres, Gregory F. Moore, Erwin Suess, Gerhard Bohrmann; Temporal and spatial evolution of a gas hydrate–bearing accretionary ridge on the Oregon continental margin. Geology 1999;; 27 (10): 939–942. doi: https://doi.org/10.1130/0091-7613(1999)027 2.3.CO;2 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 A seismic-reflection survey on the Oregon continental margin conducted in 1989 indicates the widespread presence of gas hydrate beneath the middle and lower slope of this accretionary margin. The seismic signature of gas hydrate, a bottom simulating reflector (BSR) with negative polarity that locally cuts across stratigraphic horizons, is especially well developed beneath Hydrate Ridge. This anomalously shallow accretionary ridge was drilled during Ocean Drilling Program Leg 146 to study fluid venting. In this paper we focus on the seismic data from the southern part of Hydrate Ridge, where little evidence of active venting has previously been reported but where the seismic data indicate a complicated subsurface plumbing system. Apparent disruptions of the BSR beneath the western ridge flank suggest dissociation of gas hydrate in response to slumping. A double BSR beneath the southern crest suggests hydrate destabilization in response to tectonic uplift and folding. On the basis of these and other observations, we propose a qualitative model for the evolution of a hydrate-bearing ridge in an active accretionary complex in which gas hydrate initially stabilizes the sea floor, permitting construction of large ridges that are then eaten away by slumps along their margins. The north-to-south variation in sea-floor venting and subsurface seismic structure along Hydrate Ridge may reflect different stages in the temporal evolution of one of these ridges. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.