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Low-latitude “dusty events” vs. high-latitude “icy Heinrich Events”

Published online by Cambridge University Press:  20 January 2017

Elsa Jullien*
Affiliation:
EPOC, UMR 5805, Université Bordeaux I, 33405 Talence, France
Francis Grousset
Affiliation:
EPOC, UMR 5805, Université Bordeaux I, 33405 Talence, France
Bruno Malaizé
Affiliation:
EPOC, UMR 5805, Université Bordeaux I, 33405 Talence, France
Josette Duprat
Affiliation:
EPOC, UMR 5805, Université Bordeaux I, 33405 Talence, France
Maria Fernanda Sanchez-Goni
Affiliation:
EPOC, UMR 5805, Université Bordeaux I, 33405 Talence, France
Frédérique Eynaud
Affiliation:
EPOC, UMR 5805, Université Bordeaux I, 33405 Talence, France
Karine Charlier
Affiliation:
EPOC, UMR 5805, Université Bordeaux I, 33405 Talence, France
Ralph Schneider
Affiliation:
Institut für Geowissenschaften, Christian-Albrechts-Universitaet, 10/24118 Kiel, Germany
Aloys Bory
Affiliation:
PBDS, UMR 8110 CNRS, Université de Lille 1, 59655 Villeneuve d'Ascq, France
Viviane Bout
Affiliation:
PBDS, UMR 8110 CNRS, Université de Lille 1, 59655 Villeneuve d'Ascq, France
Jose Abel Flores
Affiliation:
Departamento de Geología, Universidad de Salamanca, 37008, Salamanca, Spain
*
* Corresponding author. Fax: +33 556 840 848. E-mail address: e.jullien@epoc.u-bordeaux1.fr (E. Jullien).

Abstract

It has been proposed that tropical events could have participated in the triggering of the classic, high-latitude, iceberg-discharge Heinrich events (HE). We explore low-latitude Heinrich events equivalents at high resolution, in a piston core recovered from the tropical north-western African margin. They are characterized by an increase of total dust, lacustrine diatoms and fibrous lacustrine clay minerals. Thus, low-latitude events clearly reflect severe aridity events that occurred over Africa at the Saharan latitudes, probably induced by southward shifts of the Inter Tropical Convergence Zone. At a first approximation, it seems that there is more likely synchronicity between the high-latitude Heinrich Events (HEs) and low-latitude events (LLE), rather than asynchronous behaviours.

Type
Research Article
Copyright
University of Washington

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