TY - JOUR T1 - Co-variations of climate and silicate weathering in the Nile Basin during the Late Pleistocene A1 - Bastian,Luc A1 - Mologni,Carlo A1 - Vigier,Nathalie A1 - Bayon,Germain A1 - Lamb,Henry A1 - Bosch,Delphine A1 - Kerros,Marie-Emmanuelle A1 - Colin,Christophe A1 - Revel,Marie AD - Université de la Cote d’Azur, CNRS, OCA, IRD, Geoazur, 250 rue Albert Einstein, 06500, Valbonne, France AD - Laboratoire d’Océanographie de Villefranche sur Mer (LOV, IMEV), CNRS, Sorbonne Université, 181 chemin du Lazaret, 06320, Villefranche sur Mer, France AD - 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 AD - IFREMER, Unité de Recherche Géosciences Marines, 29280, Plouzané, France AD - Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, SY23 3DB, UK AD - Botany Department, School of Natural Sciences, Trinity College, Dublin 2, Ireland AD - Géosciences Montpellier, UMR-CNRS 5243, Université de Montpellier, 34095, Montpellier, France AD - Laboratoire GEOsciences Paris-Sud (GEOPS), UMR 8148, CNRS-Université de Paris-Sud, Université Paris-Saclay, Bâtiment 504, 91405, Orsay Cedex, France UR - https://doi.org/10.1016/j.quascirev.2021.107012 DO - 10.1016/j.quascirev.2021.107012 KW - Chemical weathering KW - 110,000 ka BP KW - Lake Tana KW - Nile deep sea fan KW - Source-tosink approach KW - Nd isotope KW - Li isotope N2 - 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. Y1 - 2021/07 PB - Elsevier BV JF - Quaternary Science Reviews SN - 0277-3791 VL - 264 ID - 81162 ER -