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Media type:
E-Article
Title:
La néotectonique méditerranéenne et ses relations avec la morphogenèse villafranchienne
Contributor:
Dufaure, Jean Jacques
Published:
PERSEE Program, 1983
Published in:
Bulletin de l'Association française pour l'étude du quaternaire, 20 (1983) 2, Seite 103-121
Language:
French
DOI:
10.3406/quate.1983.1456
ISSN:
0004-5500
Origination:
Footnote:
Description:
If formerly, coarse villafranchian sediments were considered of tectonic origin, nowadays, detrital unloadings are rather systematically explained by climatic crisis. Palynogical data seem strengthen this attitude. Yet, a critical study of various types of coarse formations — "block formations", breccie, piedmont series, fluvial conglomerates — shows that, in most cases, it is not possible to keep from a tectonic influence. The chronological discrepancy of the disequelibnum of slopes, according to regions, is certainly a positive proof of it. Moreover, objective evidences of villafranchian tectonic activity do not fail recurrent faulting in Greece and Italy, compresional deformations, namely of alpine front in the Digne arc, but also in Tell and Atlas mountains, active piedmonts and continental basins controlling thick detrital sedimentation. In spite of numerous uncertainties, tectonic component appears essential to explain the morphogenesis of lower and middle Villafranchian (Upper Pliocene), while coldness is probably the chief cause of slope degradation in upper Villafranchian (lower Pleistocene). This assertion must be adapted to unequal intensity of neotectonics according to regions.