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High-resolution geo...
High-resolution geophysical observations of the Yermak Plateau and northern Svalbard margin : Implications for ice-sheet grounding and deep-keeled icebergs
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Dowdeswell, J. A. (author)
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- Jakobsson, Martin, 1966- (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Marin geologi
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Hogan, K. A. (author)
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- O'Regan, Matt (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Marin geologi
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- Backman, Jan (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Marin geologi
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Evans, J. (author)
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- Hell, Benjamin (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Marin geologi
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- Löwemark, Ludvig (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Marin geologi
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Marcussen, C. (author)
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Noormets, R. (author)
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O'Cofaigh, C. (author)
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- Sellén, Emma (author)
- Stockholms universitet,Institutionen för geologiska vetenskaper,Marin geologi
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Sölvsten, M. (author)
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(creator_code:org_t)
- Elsevier BV, 2010
- 2010
- English.
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In: Quaternary Science Reviews. - : Elsevier BV. - 0277-3791 .- 1873-457X. ; 29:25-26, s. 3518-3531
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https://su.diva-port... (primary) (Raw object)
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http://su.diva-porta...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- High-resolution geophysical evidence on the seafloor morphology and acoustic stratigraphy of the Yermak Plateau and northern Svalbard margin between 79°20′ and 81°30′N and 5° and 22°E is presented. Geophysical datasets are derived from swath bathymetry and sub-bottom acoustic profiling and are combined with existing cores to derive chronological control. Seafloor landforms, in the form of ice-produced lineations, iceberg ploughmarks of various dimensions (including features over 80 m deep and down to about 1000 m), and a moat indicating strong currents are found. The shallow stratigraphy of the Yermak Plateau shows three acoustic units: the first with well-developed stratification produced by hemipelagic sedimentation, often draped over a strong and undulating internal reflector; a second with an undulating upper surface and little acoustic penetration, indicative of the action of ice; a third unit of an acoustically transparent facies, resulting from debris flows. Core chronology suggests a MIS 6 age for the undulating seafloor above about 580 m. There are several possible explanations, including: (a) the flow of a major grounded ice sheet across the plateau crest from Svalbard (least likely given the consolidation state of the underlying sediments); (b) the more transient encroachment of relatively thin ice from Svalbard; or (c) the drift across the plateau of an ice-shelf remnant or megaberg from the Arctic Basin. The latter is our favoured explanation given the evidence currently at our disposal.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- Arctic Ocean
- glacial morphology
- ice sheets
- Earth sciences
- Geovetenskap
- Geology
- geologi
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Dowdeswell, J. A ...
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Jakobsson, Marti ...
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Hogan, K. A.
-
O'Regan, Matt
-
Backman, Jan
-
Evans, J.
-
show more...
-
Hell, Benjamin
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Löwemark, Ludvig
-
Marcussen, C.
-
Noormets, R.
-
O'Cofaigh, C.
-
Sellén, Emma
-
Sölvsten, M.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
- Articles in the publication
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Quaternary Scien ...
- By the university
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Stockholm University