Sub-Milankovitch cycles in periplatform carbonates from the early Pliocene Great Bahama Bank.

Reuning, Lars, Reijmer, John, Betzler, C., Timmermann, A. and Steph, Silke (2006) Sub-Milankovitch cycles in periplatform carbonates from the early Pliocene Great Bahama Bank. Open Access Paleoceanography, 21 (PA1017). DOI 10.1029/2004PA001075.

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Abstract

High-resolution bulk sediment (magnetic susceptibility and aragonite content) and δ18O records from two different planktonic foraminifera species were analyzed in an early Pliocene core interval from the Straits of Florida (Ocean Drilling Program site 1006). The δ18O record of the shallow-dwelling foraminifera G. sacculifer and the aragonite content are dominated by sub-Milankovitch variability. In contrast, magnetic susceptibility and the δ18O record of the deeper-dwelling foraminifera G. menardii show precession cycles. The relationship between the aragonite and the paleoproxy data suggests that the export of sediment from the adjacent Great Bahama Bank was triggered directly by atmospheric processes rather than by sea level change. We propose a climate mechanism that bears similarities with the semiannual cycle component of eastern equatorial Pacific sea surface temperatures under present-day conditions.

Document Type: Article
Keywords: sub-Milankovitch cycles; teleconnections; Bahamas; aragonite cycles; El Niño–like state; precession
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2004PA001075
ISSN: 0883-8305
Projects: ODP
Date Deposited: 03 Dec 2008 16:51
Last Modified: 10 May 2017 09:05
URI: http://oceanrep.geomar.de/id/eprint/600

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