Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The role of playas in pedogenic gypsum crust formation in the Central Namib Desert: A theoretical model
Autore:
Eckardt, FD; Drake, N; Goudie, AS; White, K; Viles, H;
Indirizzi:
Univ Botswana & Swaziland, Dept Environm Sci, Gaborone, Botswana Univ Botswana & Swaziland Gaborone Botswana onm Sci, Gaborone, Botswana Univ London Kings Coll, Dept Geog, London WC2R 2LS, England Univ London Kings Coll London England WC2R 2LS London WC2R 2LS, England Univ Oxford, Sch Geog, Oxford OX1 3TB, England Univ Oxford Oxford England OX1 3TB rd, Sch Geog, Oxford OX1 3TB, England Univ Reading, Dept Geog, Reading RG6 6AB, Berks, England Univ Reading Reading Berks England RG6 6AB eading RG6 6AB, Berks, England
Titolo Testata:
EARTH SURFACE PROCESSES AND LANDFORMS
fascicolo: 11, volume: 26, anno: 2001,
pagine: 1177 - 1193
SICI:
0197-9337(200110)26:11<1177:TROPIP>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
LANDSAT THEMATIC MAPPER; SOUTHERN TUNISIA; SAND SEA; ORIGIN; AUSTRALIA; CHEMISTRY; DEPOSITS; INDICATORS; EVOLUTION; SULFATE;
Keywords:
gypsum; playas; sabkhas; Namib Desert; mineral dust;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: Eckardt, FD Univ Botswana & Swaziland, Dept Environm Sci, Private Bag 0022, Gaborone, Botswana Univ Botswana & Swaziland Private Bag 0022 Gaborone Botswana
Citazione:
F.D. Eckardt et al., "The role of playas in pedogenic gypsum crust formation in the Central Namib Desert: A theoretical model", EARTH SURF, 26(11), 2001, pp. 1177-1193

Abstract

The formation of Namibia's extensive pedogenic gypsum crusts (CaSO4. 2H(2)O) is interpreted in a new light. It is suggested that gypsum primarily precipitates at isolated points of evaporitic concentration, such as inland playas, and that deflation of evaporitic-rich gypsum dust from these playas contributes to the formation of pedogenic gypsum duricrusts on the coastal gravel plains of the Namib Desert surrounding these playas. This study establishes the nature, extent and distribution of playas in the Central Namib Desert and provides evidence for playa gypsum deflation and gravel plain deposition. Remote sensing shows the distribution of playas, captures ongoing deflation and provides evidence of gypsum deflation. It is proposed that, following primary marine aerosol deposition, both inland playas and coastal sabkhas generate gypsum which through the process of playa deflation and gravel plain redeposition contributes to the extensive pedogenic crusts foundin the Namib Desert region. Copyright (C) 2001 John Wiley & Sons, Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 14:14:06