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(Article of periodic en Anglais - 2013)

Document title

A micromorphological view through a Namaqualand termitaria (Heuweltjie, a Mima-like mound)

Authors(s) and Affiliation(s)

FRANCIS M.L. (1 2) ; ELLIS F. (1 2) ; LAMBRECHTS J.J.N. (1 2) ; POCH R.M. (1 2) ;
(1) Dept. of Soil Science, Univ. Western Cape, Stellenbosch, AFRIQUE DU SUD
(2) Dept. de Medi Ambient i Ciències del Sòl, Univ., Lleida, ESPAGNE

Abstract

The AA. investigated the genesis of the Hardpans associated with the heuweltjie mound, with a particular focus on the build-up of calcite and sepiolite. The micromorphological study examined a transect through a representative sepiolite-bearing heuweltjie on the coast near the Olifants River mouth, and revealed evidence of termite activity in the central (petro)calcic part of the mound. It is showed that mounds contain calcite, sepiolite, silica not found in surrounding landscape and that centre of mounds enriched in basic cations due to vegetation foraging by termites. The presence of the sepiolite, with its Mg-rich composition and hydrophilic character, together with organic acids generated from the vegetation collected by the termites, is considered to be an explanation for the formation of "ooids", radial calcite crystals associated with a core of sepiolite. The presence of faecal spherulites in termite excrement is significant since it shows that faecal spherulites can be distributed over a wider area than that directly associated with mammalian herbivores

Source

Article of periodic

published at : Catena / ISSN 0341-8162

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

Millesime : 2013, vol. 100 [pp. 57-73]

Bibliographic references : 2 p.

Collation : 17 fig., 4 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2012.08.004

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2013
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