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(Article of periodic en Anglais - 2011)

Document title

Rare earth and other trace and major elemental distribution in a pedogenic calcrete profile (Slimene, NE Tunisia)

Authors(s) and Affiliation(s)

PRUDÊNCIO M.I. (1 2) ; DIAS M.I. (1 2) ; WAERENBORGH J.C. (1) ; RUIZ F. (3) ; TRINDADE M.J. (1 2) ; ABAD M. (3) ; MARQUES R. (1 2) ; GOUVEIA M.A. (1) ;
(1) Inst. Tecnológico e Nuclear, Sacavém, PORTUGAL
(2) GeoBioTec-GeoBiociências, GeoTecnologias e GeoEngenharias (Foundation for Science and Technology), Univ., Aveiro, PORTUGAL
(3) Dep. Geodinámica y Paleontología, Univ., Huelva, ESPAGNE

Abstract

A calcrete profile developed on the top of a calcareous consolidated dune located in a coastal area of NE Tunisia (semi-arid climate) was studied with the aim to investigate the behavior of the chemical elements (rare earth elements—REE—and other trace and major elements) during the processes associated with calcrete formation, particularly dissolution and precipitation of carbonates in the vadose zone. The profile shows a vertical sequence, with clear zonations from the surface downwards: a reddish soil at the land surface, a nodular horizon, a laminar-structured level, and the consolidated old dune. The most significant chemical variations associated with the calcrete formation are : enrichment of Co, U, Br, and REE in calcrete; MREE depletion near surface, particularly Eu, MREE and HREE enrichment in calcrete; Hf, Zr, Cr, Th, Cs, Ta, Ga, Rb, K retained near surface where calcite was dissolved. Fe is more reduced at surface. The ratio goethite/hematite increases downwards

Source

Article of periodic

published at : Catena / ISSN 0341-8162

Editor : Catena, Cremlingen-Destedt - ALLEMAGNE (1973)

Millesime : 2011, vol. 87, no1 [pp. 147-156]

Bibliographic references : 1 p.

Collation : 12 fig., 3 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2011.05.018

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2011
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