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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 ,
Francis Grousset ,
Bruno Malaizé ,
Josette Duprat ,
Maria Fernanda Sanchez-Goni ,
Frédérique Eynaud ,
Karine Charlier ,
Ralph Schneider ,
Aloys Bory  and
Viviane Bout
...Show all authors
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).
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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.

Keywords

PleistoceneLow-latitudesHeinrich eventsDustTi/AlClays
Type
Research Article
Information
Quaternary Research , Volume 68 , Issue 3 , November 2007 , pp. 379 - 386
Copyright
University of Washington

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