First Nd isotope record of Mediterranean–Atlantic water exchange through the Moroccan Rifian Corridor during the Messinian Salinity Crisis.

Ivanovic, Ruza F., Flecker, Rachel, Gutjahr, Marcus and Valdes, Paul J. (2013) First Nd isotope record of Mediterranean–Atlantic water exchange through the Moroccan Rifian Corridor during the Messinian Salinity Crisis. Earth and Planetary Science Letters, 368 . pp. 163-174. DOI 10.1016/j.epsl.2013.03.010.

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Abstract

We present the first neodymium isotope reconstruction of Mediterranean–Atlantic water exchange through the Moroccan (‘Rifian’) Corridor 8–5 Ma. This covers the late Miocene Messinian Salinity Crisis (MSC); a period when progressive tectonic restriction of the Mediterranean–Atlantic seaways resulted in extreme, basin-wide Mediterranean salinity fluctuations. The Rifian Corridor was one of these seaways and until now, relatively poor age constraints existed for the timing of Corridor closure, due to the impact of uplift and erosion on the sedimentary record. The bottom water Nd isotope record from the continuous Bou Regreg Valley succession in northwest Morocco allows us to explore corridor connectivity with the Atlantic. Data from the interior and Mediterranean edge of the Rifian Corridor (respectively, the Taza–Guercif and Melilla basins, northern Morocco) provide new information on corridor shallowing and the provenance of water flowing through the seaway. As a result, we can constrain the age of Rifian Corridor closure to 6.64–6.44 Ma. We also find no evidence of the siphoning of Atlantic waters through the seaway (7.20–6.58 Ma). Our results cannot exclude the possibility that at times during the Messinian Salinity Crisis, Mediterranean Outflow Water reached the Atlantic.

Document Type: Article
Additional Information: WOS:000320087900017
Keywords: Messinian Salinity Crisis; Mediterranean–Atlantic exchange; neodymium isotopes; Rifian Corridor; Mediterranean Outflow Water; Nd/Ca; RARE-EARTH-ELEMENTS; OCEAN CIRCULATION MODEL; LAST GLACIAL MAXIMUM; FOSSIL FISH TEETH; NEODYMIUM ISOTOPES; NORTH-ATLANTIC; LATE MIOCENE; INDIAN-OCEAN; THERMOHALINE CIRCULATION; PLANKTONIC-FORAMINIFERA
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.epsl.2013.03.010
ISSN: 0012-821X
Date Deposited: 14 May 2013 10:21
Last Modified: 06 Mar 2017 13:29
URI: http://oceanrep.geomar.de/id/eprint/21231

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