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Titolo:
Dust and loessic alluvial deposits in Northwestern Namibia (Damaraland, Kaokoveld): sedimentology and palaeoclimatic evidence based on luminescence data
Autore:
Eitel, B; Blumel, WD; Huser, K; Mauz, B;
Indirizzi:
Univ Passau, Dept Geog, D-94032 Passau, Germany Univ Passau Passau Germany D-94032 u, Dept Geog, D-94032 Passau, Germany Univ Stuttgart, Dept Geog, D-70174 Stuttgart, Germany Univ Stuttgart Stuttgart Germany D-70174 eog, D-70174 Stuttgart, Germany Univ Bayreuth, Dept Earth Sci, D-95447 Bayreuth, Germany Univ Bayreuth Bayreuth Germany D-95447 th Sci, D-95447 Bayreuth, Germany Univ Karlsruhe, Dept Mineral, D-76131 Karlsruhe, Germany Univ Karlsruhe Karlsruhe Germany D-76131 ral, D-76131 Karlsruhe, Germany
Titolo Testata:
QUATERNARY INTERNATIONAL
, volume: 76-7, anno: 2001,
pagine: 57 - 65
SICI:
1040-6182(2001)76-7:<57:DALADI>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
SOUTHERN-AFRICA; CLIMATIC-CHANGE; DESERT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Eitel, B Univ Passau, Dept Geog, Schustergasse 21, D-94032 Passau, GermanyUniv Passau Schustergasse 21 Passau Germany D-94032 sau, Germany
Citazione:
B. Eitel et al., "Dust and loessic alluvial deposits in Northwestern Namibia (Damaraland, Kaokoveld): sedimentology and palaeoclimatic evidence based on luminescence data", QUATERN INT, 76-7, 2001, pp. 57-65

Abstract

In northwestern Namibia, silty deposits are widespread. The silts consist of two major components: locally produced weathering detritus and allochthonous dust blown in from the western Kalahari to the eastern margin of the Namib Desert. Sedimentological analysis and luminescence age estimations allow identification of distinct sedimentological and geomorphological processes associated with two different climatic periods. Between about 30 and 8 ka loessic alluvial deposits several metres in thickness accumulated in valleys and basins. The deposition was generated by weak slope wash and/or endoreic drainage of the ephemeral rivers. The dust input and the accumulation of silt in the valleys indicate semi-arid climatic conditions with weak summer rains and long dry seasons. Since about 9-8 ka. silt terraces caused byfluvial incision and erosion have been formed. These indicate more humid conditions than had occurred before. The change from a dry to a moister semi-arid climate at about 9-8 ka is confirmed by proxy data from drill cores off the Namibian coast and by dune studies in the south western Kalahari. (C) 2001 Published by Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 23:11:54