DOI: 10.1016/j.quascirev.2017.03.015
Scopus记录号: 2-s2.0-85015983964
论文题名: North-African paleodrainage discharges to the central Mediterranean during the last 18,000 years: A multiproxy characterization
作者: Wu J. ; Liu Z. ; Stuut J.-B.W. ; Zhao Y. ; Schirone A. ; de Lange G.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 163 起始页码: 95
结束页码: 113
语种: 英语
英文关键词: African humid period
; Clay minerals
; Grain size end-member modeling
; Inorganic geochemistry
; North Africa
; Paleoclimatology
; Paleodrainage systems
; Provenance
; Quaternary
; Sapropel S1
Scopus关键词: Atmospheric thermodynamics
; Climate change
; Dust
; Geochemistry
; Grain size and shape
; Groundwater
; Groundwater geochemistry
; Hierarchical systems
; Minerals
; Endmembers
; Humid periods
; Inorganic geochemistries
; North Africa
; Paleoclimatology
; Paleodrainage
; Provenance
; Quaternary
; Sapropel S1
; Clay minerals
英文摘要: 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. © 2017 Elsevier Ltd
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59260
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Earth Sciences – Geochemistry, Utrecht UniversityUtrecht, Netherlands; State Key Laboratory of Marine Geology, Tongji University, Shanghai, China; NIOZ, Royal Netherlands Institute for Sea Research, Utrecht University, Den Burg, Netherlands; MARUM, Center for Marine Environmental Sciences, Bremen University, Bremen, Germany; ENEA, Marine Environment Research Centre, P.O. Box 224, La Spezia, Italy
Recommended Citation:
Wu J.,Liu Z.,Stuut J.-B.W.,et al. North-African paleodrainage discharges to the central Mediterranean during the last 18,000 years: A multiproxy characterization[J]. Quaternary Science Reviews,2017-01-01,163