Darby, Dennis A (2009): Drift distances, times and primary grain sources of the Arctic Ocean, Exp302 (ACEX) [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.711530, Supplement to: Darby, DA (2008): Arctic perennial ice cover over the last 14 million years. Paleoceanography, 23, PA1S07, https://doi.org/10.1029/2007PA001479
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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.
Project(s):
Coverage:
Median Latitude: 83.763739 * Median Longitude: 84.810652 * South-bound Latitude: 70.000000 * West-bound Longitude: -138.300000 * North-bound Latitude: 87.890000 * East-bound Longitude: 176.156522
Event(s):
302-CompSite * Latitude: 87.890000 * Longitude: 137.650000 * Elevation: -1251.0 m * Campaign: Exp302 (Arctic Coring Expedition, ACEX) * Basis: CCGS Captain Molly Kool (Vidar Viking) * Method/Device: Composite Core (COMPCORE) * Comment: Virtual core composed of spliced cores from Holes M0002A, M0003A, M0004A and M0004C. Virtual position and water depth is calculated as the mean of all Exp302 sites.
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Darby, DA (2009): (Table 1) Ice drift distances and times based on a reconstruction of the Arctic Ocean at 15 Ma and today (Exp302, ACEX). https://doi.org/10.1594/PANGAEA.711528
- Darby, DA (2009): (Table 2) Comparison of primary grain sources for Exp302 (ACEX) core site and cores 94BC28 and PS1230. https://doi.org/10.1594/PANGAEA.711529