Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
| one publication added to basket [284209] |
North-African paleodrainage discharges to the central Mediterranean during the last 18,000 years: A multiproxy characterization
Wu, J.; Liu, Z.; Stuut, J-B W.; Zhao, Y.; Schirone, A.; de Lange, G.J. (2017). North-African paleodrainage discharges to the central Mediterranean during the last 18,000 years: A multiproxy characterization. Quat. Sci. Rev. 163: 95-113. dx.doi.org/10.1016/j.quascirev.2017.03.015
In: Quaternary Science Reviews. Pergamon Press: Oxford; New York. ISSN 0277-3791; e-ISSN 1873-457X, meer
|  |
| Author keywords |
Quaternary; Paleoclimatology; North Africa; Inorganic geochemistry; Clay minerals; Grain size end-member modeling; African humid period; Sapropel S1; Provenance; Paleodrainage systems |
| Auteurs | | Top |
- Wu, J.
- Liu, Z.
- Stuut, J-B W., meer
|
- Zhao, Y.
- Schirone, A.
- de Lange, G.J.
|
|
| Abstract |
Using elemental geochemistry, clay mineralogy, grain size end-member modeling, and planktonic foraminiferal δ18O, we characterize the provenance of central-Mediterranean sediments over the past 18 ka. The provenance is dust-dominated before and after the African Humid Period (AHP). By contrast, during the AHP (∼11–5 ka), largely concurrent with organic-rich sapropel S1 formation, it is predominantly riverine from North-African sources. Such fluvial supply is suggested to come from paleodrainage networks that were reactivated by intensified monsoon precipitation during the AHP. The supply is characterized by high Mg/Al and smectite contents, and has been accompanied by considerable freshwater influx, as indicated by the enhanced grain size and lighter foraminiferal δ18O. The clay-mineral assemblages in our core and in nearby cores correspond with a provenance from the Libyan-Tunisian margin, mainly via the paleo-river Irharhar. The inferred fluvial discharge is strongest during the late-AHP (∼8–5.5 ka), coinciding with reported enhanced fluvial dynamics and wettest conditions over western Libya and Tunisia/Algeria. This period is not only synchronous with the largest extension of open-water bodies in North Africa and lowest Saharan dust inputs, but also consistent with precipitation records of the West-African monsoon. Moreover, our records show a remarkable correspondence with that of a paleodrainage system towards the Atlantic West-African margin, inferring a common headwater region in the central Saharan mountains, and a similar climate mechanism. Taken together, we suggest a dominant control of North-African humid surfaces on the paleodrainage delivery, modulated by groundwater level, in response to the insolation-driven West-African monsoon precipitation. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
