|
|||||
|
|
Nile floods recorded in deep Mediterranean sediments |
|
| Authors: | Emmanuelle Ducassou Thierry Mulder Sbastien Migeon Eliane Gonthier Anne Murat Marie Revel Lucilla Capotondi Stefano M Bernasconi Jean Mascle Sbastien Zaragosi |
| Institution: | aUniversité Bordeaux 1, UMR EPOC, avenue des facultés, 33405 Talence, France;bGéosciences-Azur, BP48, 06235 Villefranche-sur-Mer, France;cCnam-Intechmer, BP324, 50103 Cherbourg, France;dISMAR – Marine Geology Section CNR, via Gobetti 101, 40129 Bologna, Italy;eETH Zurich, Geologisches Institut, 8092 Zuerich, Switzerland |
| Abstract: | Clastic mud beds rich in continental organic matter are observed recurrently in the Nile deep-sea turbidite system. They formed during flooding periods of the river similar to those that induce sapropel formation and occurred during periods of increased density stratification of the eastern Mediterranean. The very fine-grained flood deposits are intercalated within pelagic sediments, sapropels and Bouma-type turbidites. These flood deposits form by the successive reconcentrations of surface (hypopycnal) plumes by convective sedimentation, which in turn generate a fine-grained low-energy hyperpycnal flow. Sea-level high stands seem also to favor hypopycnal plume formation and increase clastic mud bed formation. Consequently, these muddy clastic beds provide a direct link between deep-marine sedimentary records and continental climatic change through flood frequency and magnitude. |
| Keywords: | Eastern Mediterranean Flood-related deposits Convective sedimentation Pluvial periods Sapropels Nile floods |
| 本文献已被 ScienceDirect 等数据库收录！ | |