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(Article of periodic en Anglais - 2014)

Document title

Influence of subaqueous processes on the construction and accumulation of an aeolian sand sheet

Authors(s) and Affiliation(s)

BASILICI G. (1) ; FÜHR DAL'BÓ P.F. (1) ;
(1) Dept. of Geology and Natural Resources, Inst. of Geosciences, State Univ., Campinas, BRESIL

Abstract

On the sand sheet surface, located in the Upper Tulum Valley (Argentina), airflows enable the construction of nabkhas, wind-rippled mantles, megaripples, and small transverse dunes. Subaqueous deposits consist of sandy current ripples covered by muddy laminae. The construction of the sand sheet is controlled by meteorological seasonal changes : the source area, the San Juan river alluvial fan, receives sediment by thaw-waters in spring–summer; in fall–winter, when the water table lowers in the alluvial fan, the sediment is available for aeolian transport and construction of the sand sheet area. The flood events play an important role in enabling sand sheet accumulation. Episodic and alternating events of erosion and sedimentation are considered the main reason for the absence of soils and palaeosols. Results from this study have enabled the development of a generic model with which to account for : 1) the influence of contemporaneous subaqueous processes on the construction and accumulation in recent and ancient sand sheets; and 2) the absence of developed soils in this unstable topographic surface

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2014, vol. 39, no8 [pp. 1014-1029]

Bibliographic references : 1 P.

Collation : 15 fig., 3 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3498

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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