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Glacial geological implications of overconsolidated sediments on the Lomonosov Ridge and Yermak Plateau
Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden..
Stockholm Univ, Dept Geol Sci, S-10691 Stockholm, Sweden..ORCID-id: 0000-0002-9033-3559
Stockholm Univ, Dept Phys Geog & Quaternary Geol, 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. 3532-3544Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

With the coupled use of multibeam swath bathymetry, high-resolution subbottom profiling and sediment coring from icebreakers in the Arctic Ocean, there is a growing awareness of the prevalence of Quaternary ice-grounding events on many of the topographic highs found in present water depths of <1000 m. In some regions, such as the Lomonosov Ridge and Yermak Plateau, overconsolidated sediments sampled through either drilling or coring are found beneath seismically imaged unconformities of glacigenic origin. However, there exists no comprehensive analysis of the geotechnical properties of these sediments, or how their inferred stress state may be related to different glacigenic processes or types of ice-loading. Here we combine geophysical, stratigraphic and geotechnical measurements from the Lomonosov Ridge and Yermak Plateau and discuss the glacial geological implications of overconsolidated sediments. The degree of overconsolidation, determined from measurements of porosity and shear strength, is shown to result from consolidation and/or deformation below grounded ice and, with the exception of a single region on the Lomonosov Ridge, cannot be explained by erosion of overlying sediments. We demonstrate that the amount and depth of porosity loss associated with a middle Quaternary (similar to 790-950 thousand years ago - ka) grounding on the Yermak Plateau is compatible with sediment consolidation under an ice sheet or ice rise. Conversely, geotechnical properties of sediments from beneath late Quaternary ice-groundings in both regions, independently dated to Marine Isotope Stage (MIS) 6, indicate a more transient event commensurate with a passing tabular iceberg calved from an ice shelf. (C) 2010 Elsevier Ltd. All rights reserved.

sted, utgiver, år, opplag, sider
2010. Vol. 29, nr 25-26, s. 3532-3544
HSV kategori
Forskningsprogram
SWEDARCTIC 2005, Beringia 2005; SWEDARCTIC 2007, LOMROG
Identifikatorer
URN: urn:nbn:se:polar:diva-2388DOI: 10.1016/j.quascirev.2010.09.009ISI: 000284724400014OAI: oai:DiVA.org:polar-2388DiVA, id: diva2:859098
Tilgjengelig fra: 2015-10-06 Laget: 2015-10-06 Sist oppdatert: 2017-12-01

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