Sedimentary and paleobiological records of the latest Pleistocene-Holocene climate evolution in the Kordofan region, Sudan
| Autor: | Ahmed Dawelbeit, Etienne Jaillard, Ali A.M. Eisawi |
|---|---|
| Přispěvatelé: | Institut des Sciences de la Terre (ISTerre), Centre National de la Recherche Scientifique (CNRS)-PRES Université de Grenoble-Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
African humid period
010504 meteorology & atmospheric sciences Pleistocene Paleoclimate Sedimentary environment Fluvial Geology 15. Life on land 010502 geochemistry & geophysics 01 natural sciences Quaternary Paleontology Aridification [SDU]Sciences of the Universe [physics] Paleoclimatology Aeolian deposits Aeolian processes Sedimentary rock Paleobiological indicators Holocene 0105 earth and related environmental sciences Earth-Surface Processes |
| Zdroj: | Journal of African Earth Sciences Journal of African Earth Sciences, Elsevier, 2019, 160, pp.103605-. ⟨10.1016/j.jafrearsci.2019.103605⟩ Journal of African Earth Sciences, 2019, 160, pp.103605-. ⟨10.1016/j.jafrearsci.2019.103605⟩ |
| ISSN: | 1464-343X 1879-1956 |
| Popis: | The study of the Quaternary sediments of the Kordofan region, Sudan, allowed to decipher the succession of environments in this area, since about 13 kyr. The oldest sediments (>13 to 10.5 kyr BP) are mainly aeolian deposits , except in the southern areas. The “African Humid Period” is recorded by scattered palustrine and lacustrine carbonates dated at 10.5–6.5 kyr BP in the center and North, respectively, by fluvial deposits in the South, and by the pedogenesis of previous deposits in all areas. Fluvial activity may be responsible for the erosion of the previous aeolian sands in the southern areas. Between 6.5 and 3.3 kyr BP, the evolution from aquatic to terrestrial gastropod fauna, and from tropical to arid pollen assemblages points to the shift toward an arid climate. This aridification phase culminated between 3.3 and 1.1 kyr BP, with a period of strong aeolian activity and erosion. Aeolian deposition resumed after 1.1 kyr BP under conditions comparable to those of today. This evolution is consistent with that recorded in Saharan areas, although the period of strong aeolian erosion (≈3.3–1.1 kyr BP) may have been underestimated so far. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect