Document Type

Article

Publication Date

2008

DOI

10.1029/2007pa001479

Publication Title

Paleoceanography

Volume

23

Issue

1

Pages

PA1S07 (9 pages)

Abstract

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.

Comments

Web of Science: "Free full text from publisher -- gold open access."

Original Publication Citation

Darby, D. A. (2008). Arctic perennial ice cover over the last 14 million years. Paleoceanography, 23(1), PA1S07. doi:10.1029/2007pa001479

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