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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Pie de Palo, Argentina : a cataclastic diapir

Auteur(s) et Affiliation(s)

Dep. of Mineralogy, Natural History Museum, London, Royaume-Uni


Description :
The term cataclastic diapirism is proposed for the low-temperature extrusion of highly fractured rocks through more competent strata to produce domed topographies at the surface. The process is illustrated by reference to the geomorphology, neotectonics and microseismicity of the Pie de Palo, an elongated ridge in the western Sierras Pampeanas of Argentina composed of shattered and sheared Lower Palaeozoic rocks and subject to coseismic uplift. The Pie de Palo is conventionally interpreted as a fault-driven basement fold linked to low-angle eastward subduction of the Nazca plate beneath South America; the diapiric model implies instead that deformation is powered by regional compression from west-verging, near-surface, crustal shortening which results ultimately from Atlantic spreading.


Type de document :
Article de périodique

Source :
Geomorphology (Amsterdam), issn : 0169-555X, 2009, vol. 104, n°. 3-4, p. 317-322, nombre de pages : 6, Références bibliographiques : 1 p.

Date :
2009

Editeur :
Pays édition : Pays-Bas, Amsterdam, Elsevier

Langue :
Anglais
Droits :
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