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(Article of periodic en Anglais - 2014)

Document title

Distribution of secondary minerals in crusts developed on sandstone exposures

Authors(s) and Affiliation(s)

ALEXANDROWICZ Z. (1) ; MARSZAŁEK M. (2) ; RZEPA G. (2) ;
(1) Inst. of Nature Conservation, Polish Academy of Sciences, Kraków, POLOGNE
(2) AGH Univ. of Science and Technology, Kraków, POLOGNE

Abstract

This study considers the surfaces of sandstone tors in the Polish Outer Carpathians. The exposed parts of the rocks in this area are often covered by crust, which is up to several centimetres thick, and differs from the internal part in colour and composition. The crusts were characterized using light and electron microscopy, X-ray diffractometry, thermal analyses, Mössbauer spectroscopy, bulk chemical analyses and sequential chemical extractions. Porosity was estimated by digital image processing. Development of the crust results from silicon and iron redistribution during the sandstone alteration. Hematite is probably a result of goethite transformation. However, air pollutants may play an important role in the formation of sulphates. Silica and iron compounds affect the properties of the rock, hardening the surface and lowering porosity by formation of secondary cement. Crystallization of sulphate salts, in turn, may contribute to mechanical disintegration of the rock

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, no3 [pp. 320-335]

Bibliographic references : 2 p.

Collation : 10 fig., 8 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3449

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