FN Archimer Export Format
PT J
TI Co-variations of climate and silicate weathering in the Nile Basin during the Late Pleistocene
BT 
AF Bastian, Luc
   Mologni, Carlo
   Vigier, Nathalie
   Bayon, Germain
   Lamb, Henry
   Bosch, Delphine
   Kerros, Marie-Emmanuelle
   Colin, Christophe
   Revel, Marie
AS 1:1,2;2:1,3;3:2;4:4;5:5,6;6:7;7:2;8:8;9:1;
FF 1:;2:;3:;4:PDG-REM-GM-LGS;5:;6:;7:;8:;9:;
C1 Université de la Cote d’Azur, CNRS, OCA, IRD, Geoazur, 250 rue Albert Einstein, 06500, Valbonne, France
   Laboratoire d’Océanographie de Villefranche sur Mer (LOV, IMEV), CNRS, Sorbonne Université, 181 chemin du Lazaret, 06320, Villefranche sur Mer, France
   Université Côte d’Azur, Centre National de la Recherche Scientifique (CNRS), Cultures et Environnements. Préhistoire, Antiquité, Moyen Age (CEPAM), UMR 7264, 24 av. des Diables Bleus, 06300, Nice, France
   IFREMER, Unité de Recherche Géosciences Marines, 29280, Plouzané, France
   Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, UK
   Botany Department, School of Natural Sciences, Trinity College, Dublin 2, Ireland
   Géosciences Montpellier, UMR-CNRS 5243, Université de Montpellier, 34095, Montpellier, France
   Laboratoire GEOsciences Paris-Sud (GEOPS), UMR 8148, CNRS-Université de Paris-Sud, Université Paris-Saclay, Bâtiment 504, 91405, Orsay Cedex, France
C2 UNIV COTE D’AZUR, FRANCE
   UNIV SORBONNE, FRANCE
   UNIV COTE D’AZUR, FRANCE
   IFREMER, FRANCE
   UNIV ABERYSTWYTH, UK
   TRINITY COLL DUBLIN, IRELAND
   UNIV MONTPELLIER, FRANCE
   UNIV PARIS SACLAY, FRANCE
SI BREST
SE PDG-REM-GM-LGS
IN WOS Ifremer UPR
   copubli-france
   copubli-europe
   copubli-univ-france
IF 4.456
TC 10
UR https://archimer.ifremer.fr/doc/00700/81162/89497.pdf
LA English
DT Article
CR MIMES
BO Pelagia
DE ;Chemical weathering;110,000 ka BP;Lake Tana;Nile deep sea fan;Source-tosink approach;Nd isotope;Li isotope
AB We have investigated provenance and weathering proxies of the clay-size sediment exported from the Nile River basin over the last 110,000 years. Using neodymium isotope composition of sediments from both the Nile Deep Sea-Fan and Lake Tana, we show that the Nile River branches draining the Ethiopian Highlands have remained the main contributors of clays to the Nile delta during the Late Quaternary. We demonstrate that fluctuations of clay-size particle contribution to the Nile Delta are mainly driven by orbital precession cycle, which controls summer insolation and consequently the African monsoon intensity changes. Our results indicate that - over the last 110,000 years – the proportion of clays coming from Ethiopian Traps fluctuates accordingly to the intensity of the last 5 precession cycles (MIS 5 to MIS 1). However, there is a threshold effect in the transport efficiency during the lowest insolation minima (arid periods), in particular during the MIS3. Several arid events corresponding to the Heinrich Stadial periods are associated with small or negligible clay source changes while chemical weathering proxies, such as δ7Li, Mg/Ti and K/Ti, vary significantly. This suggests a straightforward control of weathering by hydro-climate changes over centennial to millennial timescales. Our data also suggests a significant but more progressive influence of the temperature decrease between 110kyr and 20kyr. Taken altogether, the observed tight coupling between past climate variations and silicate weathering proxies leads us to conclude that precipitation changes in northeast Africa can impact soil development over a few hundred years only, while the influence of temperature appears more gradual. 
PY 2021
PD JUN
SO Quaternary Science Reviews
SN 0277-3791
PU Elsevier BV
VL 264
UT 000674619500003
DI 10.1016/j.quascirev.2021.107012
ID 81162
ER

EF