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Arctic perennial ice cover over the last 14 million years
Responsible organisation
2008 (English)In: Paleoceanography, ISSN 0883-8305, E-ISSN 1944-9186, Vol. 23, no 1Article in journal (Refereed) Published
Abstract [en]

Knowledge of the long-term history of the perennial ice is an important issue that has eluded study because the Cenozoic core material needed has been unavailable until the recent Arctic Coring Expedition (ACEX). Detrital Fe oxide mineral grains analyzed by microprobe from the last 14 Ma (164 m) of the ACEX composite core on the Lomonosov Ridge were matched to circum-Arctic sources with the same mineral and 12-element composition. These precise source determinations and estimates of drift rates were used to determine that these sand grains could not be rafted to the ACEX core site in less than a year. Thus the perennial ice cover has existed since 14 Ma except for the unlikely rapid return to seasonal ice between the average sampling interval of about 0.17 Ma. Both North America and Russia contributed significant Fe grains to the ACEX core during the last 14 Ma.

Place, publisher, year, edition, pages
2008. Vol. 23, no 1
National Category
Natural Sciences
Research subject
SWEDARCTIC 2004, ACEX
Identifiers
URN: urn:nbn:se:polar:diva-3151DOI: 10.1029/2007PA001479OAI: oai:DiVA.org:polar-3151DiVA: diva2:1049780
Available from: 2016-11-25 Created: 2016-11-21 Last updated: 2016-11-25

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