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2014-05-01

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/98242

Messinian productivity changes in the northeastern Atlantic and their relationship to the closure of the Atlantic-Mediterranean gateway: implications for Neogene palaeoclimate and palaeoceanography.

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http://dx.doi.org/10.1144/jgs2013-032

Abstract

The stable isotope composition of planktic and benthic foraminifera and the distribution of selected benthic foraminiferal species from a Messinian record of the lower Guadalquivir Basin, northeastern Atlantic Ocean, show that regional productivity changes were linked to glacioeustatic fluctuations. Glacial periods were characterized by poorly ventilated bottom waters as a result of weak Atlantic Meridional Overturning Circulation (AMOC), and by phases of high productivity related to intensified upwelling. In contrast, wellventilated bottom waters owing to strong AMOC, the presence of degraded organic matter in the upper slope, and high input of degraded terrestrial organic matter derived from fluvial discharge to the outer shelf were recorded during interglacial periods. Before closure of the adjacent Guadalhorce Corridor at 6.18 Ma, which was the final active Betic Atlantic-Mediterranean gateway, the study area was alternately influenced by wellventilated Mediterranean Outflow Water (MOW) and poorly ventilated Atlantic Upwelled Water (AUW). Following closure of the corridor, cessation of the MOW reduced the AMOC and promoted glacial conditions in the northern hemisphere, resulting in the establishment of local upwelling cells.

Subject

Paleoclimatologia, Messinià, Paleoceanografia

Subject (English)

Paleoclimatology, Messinian, Paleoceanography

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Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

Citation

PÉREZ-ASENSIO, José N. (José Noel), et al. Messinian productivity changes in the northeastern Atlantic and their relationship to the closure of the Atlantic-Mediterranean gateway: implications for Neogene palaeoclimate and palaeoceanography. Journal of the Geological Society. 2014. Vol. 171, num. 3, pags. 389-400. ISSN 0016-7649. [consulted: 12 of August of 2026]. Available at: https://hdl.handle.net/2445/98242

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