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High-resolution geophysical observations of the Yermak Plateau and northern Svalbard margin: implications for ice-sheet grounding and deep-keeled icebergs
Univ Cambridge, Scott Polar Res Inst, Cambridge CB2 1ER, England..
Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden..
Univ Cambridge, Scott Polar Res Inst, Cambridge CB2 1ER, England..
Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden..
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2010 (engelsk)Inngår i: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 29, nr 25-26, s. 3518-3531Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

High-resolution geophysical evidence on the seafloor morphology and acoustic stratigraphy of the Yermak Plateau and northern Svalbard margin between 79 degrees 20' and 81 degrees 30'N and 5 degrees and 22 degrees 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. (C) 2010 Elsevier Ltd. All rights reserved.

sted, utgiver, år, opplag, sider
2010. Vol. 29, nr 25-26, s. 3518-3531
HSV kategori
Forskningsprogram
SWEDARCTIC 2005, Beringia 2005; SWEDARCTIC 2007, LOMROG
Identifikatorer
URN: urn:nbn:se:polar:diva-2387DOI: 10.1016/j.quascirev.2010.06.002ISI: 000284724400013OAI: oai:DiVA.org:polar-2387DiVA, id: diva2:859096
Tilgjengelig fra: 2015-10-06 Laget: 2015-10-06 Sist oppdatert: 2017-12-01

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