Late Quaternary sedimentation within a submarine channel-levee system offshore Cap Timiris, Mauritania

Online Access: Get full text
doi: 10.1016/j.margeo.2007.02.005
Author(s): Zuhlsdorff, Christine; Wien, K.; Stuut, J. B. W.; Henrich, R.
Author Affiliation(s): Primary:
University of Bremen, Faculty of Geosciences, Bremen, Federal Republic of Germany
Volume Title: Marine Geology
Source: Marine Geology, 240(1-4), p.217-234. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0025-3227 CODEN: MAGEA6
Note: In English. 68 refs.; illus., incl. 1 table
Summary: Aeolian and fluvial sediment transport to the Atlantic Ocean offshore Mauritania were reconstructed based on grain-size distributions of the carbonate-free silt fraction of three marine sediment records of Cap Timiris Canyon to monitor the climatic evolution of present-day arid north-western Africa. During the late Pleistocene, predominantly coarse-grained particles, which are interpreted as windborne dust, characterise glacial dry climate conditions with a low sea level and extended sand seas that reach onto the exposed continental shelf off Mauritania. Subsequent particle fining and the abrupt decrease in terrigenous supply are attributed to humid climate conditions and dune stabilisation on the adjacent African continent with the onset of the Holocene humid period. Indications for an ancient drainage system, which was discharging fluvial mud offshore via Cap Timiris Canyon, are provided by the finest end member for early to mid Holocene times. However, in comparison to the Senegal and Niger River further south, the river system connecting Cap Timiris Canyon with the Mauritanian hinterland was starved during the late Holocene and is non-discharging under present-day arid climate conditions. Abstract Copyright (2007) Elsevier, B.V.
Year of Publication: 2007
Research Program: ODP Ocean Drilling Program
Key Words: 03 Geochronology; 24 Surficial Geology, Quaternary Geology; Absolute age; Africa; Atlantic Ocean; C-14; Cape Timiris Canyon; Carbon; Carbonates; Cenozoic; Clastic sediments; Climate change; Cores; Correlation; Dates; Foraminifera; Grain size; Invertebrata; Isotopes; Leg 108; Marine sedimentation; Marine sediments; Mauritania; Microfossils; Models; North Atlantic; Northeast Atlantic; ODP Site 658; Ocean Drilling Program; Ocean floors; Organic carbon; Paleoclimatology; Paleoenvironment; Protista; Quaternary; Radioactive isotopes; Sedimentary structures; Sedimentation; Sediments; Size distribution; Stream transport; Submarine canyons; Terrigenous materials; Turbidite; Upper Quaternary; West Africa; Wind transport; X-ray data
Coordinates: N190000 N200000 W0170000 W0190000
Record ID: 2007065404
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands