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Optically Stimulated Luminescence dating supports central Arctic Ocean cm-scale sedimentation rates
Ansvarig organisation
2003 (Engelska)Ingår i: Geochemistry Geophysics Geosystems, ISSN 1525-2027, E-ISSN 1525-2027, Vol. 4Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

[1] This paper presents new results from Optically Stimulated Luminescence (OSL) dating on a sediment core raised from the crest of the Lomonosov Ridge in the central Arctic Ocean. There has been much debate about dating sediment cores from the central Arctic Ocean and by using an independent absolute dating technique we aim to test whether or not relatively fast, cm-scale/ka, sedimentation rates were typical of Arctic’s Pleistocene depositional mode. On the basis of mainly paleomagnetic reversal stratigraphy, many previous studies suggest mm-scale/ka sedimentation rates. A common feature in these studies is that the first down core paleomagnetic negative inclination is consistently interpreted as the Brunhes/Matuyama boundary at about 780 ka. Our OSL dating results indicate that this assumption is not generally valid, and that the first encountered negative inclination represents younger age excursions within the Brunhes Chron, implying reinterpretation of many published core studies where paleoenvironmental reconstructions have been made for the central Arctic Ocean. Our dating results furthermore corroborates a correlation of the uppermost 2-3 m of the Lomonosov Ridge cores to a well-dated core located off the Barents-Kara Sea margin that in turn is correlated to cores in the Fram Strait. Valuable information on the paleoceanographical evolution in the Arctic Ocean from MIS 6 to the Holocene is given through this correlation of records from the central Arctic Ocean to records off the Eurasian continental margin.

Ort, förlag, år, upplaga, sidor
2003. Vol. 4
Nyckelord [en]
Arctic; geochronology; sedimentation; paleoceanography; paleomagnetics
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:polar:diva-3237DOI: 10.1029/2002GC000423OAI: oai:DiVA.org:polar-3237DiVA, id: diva2:1050078
Tillgänglig från: 2016-11-28 Skapad: 2016-11-21 Senast uppdaterad: 2017-11-29

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