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Constraints on the Pleistocene chronology of sediments from the Lomonosov Ridge
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2008 (English)In: Paleoceanography, ISSN 0883-8305, E-ISSN 1944-9186, Vol. 23, no 1Article in journal (Refereed) Published
Abstract [en]

[1] Despite its importance in the global climate system, age-calibrated marine geologic records reflecting the evolution of glacial cycles through the Pleistocene are largely absent from the central Arctic Ocean. This is especially true for sediments older than 200 ka. Three sites cored during the Integrated Ocean Drilling Program’s Expedition 302, the Arctic Coring Expedition ( ACEX), provide a 27 m continuous sedimentary section from the Lomonosov Ridge in the central Arctic Ocean. Two key biostratigraphic datums and constraints from the magnetic inclination data are used to anchor the chronology of these sediments back to the base of the Cobb Mountain subchron ( 1215 ka). Beyond 1215 ka, two best fitting geomagnetic models are used to investigate the nature of cyclostratigraphic change. Within this chronology we show that bulk and mineral magnetic properties of the sediments vary on predicted Milankovitch frequencies. These cyclic variations record “glacial” and “interglacial” modes of sediment deposition on the Lomonosov Ridge as evident in studies of ice-rafted debris and stable isotopic and faunal assemblages for the last two glacial cycles and were used to tune the age model. Potential errors, which largely arise from uncertainties in the nature of downhole paleomagnetic variability, and the choice of a tuning target are handled by defining an error envelope that is based on the best fitting cyclostratigraphic and geomagnetic solutions.

Place, publisher, year, edition, pages
2008. Vol. 23, no 1
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Natural Sciences
Research subject
SWEDARCTIC 1996, Arctic Ocean 1996; SWEDARCTIC 2004, ACEX
Identifiers
URN: urn:nbn:se:polar:diva-3145DOI: 10.1029/2007PA001551OAI: oai:DiVA.org:polar-3145DiVA: diva2:1049821
Available from: 2016-11-25 Created: 2016-11-21 Last updated: 2016-11-25

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Citation style
  • apa
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  • de-DE
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  • en-US
  • fi-FI
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  • Other locale
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