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(Article of periodic en Anglais - 2011)

Document title

Weathering mechanisms and their effects on landsliding in pelitic schist

Authors(s) and Affiliation(s)

YAMASAKI S. (1) ; CHIGIRA M. (1) ;
(1) Disaster Prevention Research Inst., Univ., Kyoto, JAPON

Abstract

Physical, chemical, and mineralogical analyses of undisturbed drill cores of pelitic schist from a landslide area in Japan clarified the mechanisms of chemical weathering of pelitic schist. Oxidizing surface water percolates downward and reaches an oxidation front, where chlorite is altered to Al-vermiculite, graphite and pyrite are oxidized and depleted, and goethite precipitates. Pyrite oxidation yields sulphuric acid, which penetrates further downward, interacting with and weakening the rocks. In addition to this chemical weakening, stress release and shearing along schistosities form an incipient shear zone, which propagates to a sliding zone that forms the rupture surface of a landslide. Once a sliding zone has developed, it inhibits downward groundwater flow across it because of its low permeability, slowing the downward propagation of the weathering zone until this filtration barrier is broken by landslide movement

Source

Article of periodic

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

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

Millesime : 2011, vol. 36, no4 [pp. 481-494]

Bibliographic references : 31 ref.

Collation : 14 fig., 4 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.2067

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