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(Article of periodic en Anglais - 2014)

Document title

Late-Pleistocene wedge structures along the Patagonian Coast (Argentina) : chronological constraints and palaeo-environmental implications

Authors(s) and Affiliation(s)

RIBOLINI A. (1) ; BINI M. (1) ; CONSOLONI I. (1) ; ISOLA I. (2) ; PAPPALARDO M. (1) ; ZANCHETTA G. (1) ; FUCKS E. (3) ; PANZERI L. (4) ; MARTINI M. (4) ; TERRASI F. (5) ;
(1) Dip. di Scienze della terra, Univ., Pisa, ITALIE
(2) Istituto de Geofisica e Vulcanologia, Pisa, ITALIE
(3) Fac. de Ciencias Naturales y Museo, Univ. Nacional, La Plata, ARGENTINE
(4) Dip. di Scienza dei Materiali, Univ., Milano, ITALIE
(5) Dip. di Scienze Ambientali, Univ., Napoli, ITALIE

Abstract

This paper investigates several wedge structures formed in continental deposits covering marine sediments deposited during MIS 5 along the central Patagonian coast of Argentina. The size and surface microtexture characteristics of the infilling sediments are consistent with a depositional environment dominated by aeolian transport. Fragments of Andean volcanic rocks (glass shards) in the wedge-fill suggest long-distance transport via a westerly component of wind direction. The wedges are interpreted as products of deep seasonal frost action in frozen ground, which produced open cracks that filled rapidly with partially non-local aeolian sediments. Many wedges cross cut carbonate crusts that formed under permafrost conditions in coastal Patagonia. The radiocarbon dating of carbonate crusts yielded an age of 25–27 kyr bp, while wedge-fill sediments are OSL dated to 14 670 ± 750 yr bp. This indicates that ground wedge formation occurred during a cold event (the Antarctic Cold Reversal period) that interrupted the permafrost degradation following the Last Glacial Maximum

Source

Article of periodic

published at : Geografiska annaler. Series A. Physical geography / ISSN 0435-3676 / CODEN GAPGAP

Editor : Svenska sällskapet för antropologi och geografi, Stockholm - SUEDE (1965)

Millesime : 2014, vol. 96, no2 [pp. 161-176]

Bibliographic references : 50 ref.

Collation : 10 fig., 3 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 2704 A

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1111/geoa.12038

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28681484 : Permanent link - XML version
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