Paleoceanography of the Deep Western Boundary undercurrent on the North American continental margin for the past 25,000 yr.

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Ledbetter, M. T., & Balsam, W. L. (1985). Paleoceanography of the Deep Western Boundary undercurrent on the North American continental margin for the past 25,000 yr. Geology, 13(3), 181-184. doi:10.1130/0091-7613(1985)13<181:POTDWB>2.0.CO;2
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TitlePaleoceanography of the Deep Western Boundary undercurrent on the North American continental margin for the past 25,000 yr.
AuthorsT. Ledbetter, L. Balsam
AbstractTemporal fluctuations of silt mean particle size and foraminiferal indices were used to examine fluctuations in velocity and position of the axis of the Deep Western Boundary Undercurrent (DWBUC) on the North American continental margin. From 25 to 17 ka the DWBUC axis was 500m shallower and farther inshore than its present position on the lower rise; current speed was high from 25 to 20 ka and then waned until 17 ka. Between 17 and 7 ka the major axis of the DWBUC shallowed to 4000m; current speed increased from 17 to 11 ka but slowed from 11 to 7 ka. Since 7 ka the DWBUC axis has deepened to its modern position at 4900m. The zone of maximum carbonate dissolution remained below the DWBUC; the most intense dissolution was from 22 to 9 ka and 5 to 2 ka. Highest abundance of Uvigerina and higest percent benthic foraminifera were immediately above the DWBUC from 22 to 7 ka, after which values of both parameters fell to near zero.
JournalGeology
Date1985
Volume13
Issue3
Start page181
End page184
ISSN00917613
NoteCited By (since 1996):23

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