Physics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..35..151b&link_type=abstract
Earth and Planetary Science Letters, Volume 35, Issue 1, p. 151-160.
Physics
10
Scientific paper
This paper presents a new interpretation of the Pyrenees. After Early Cretaceous rifting, two stable Atlantic-type continental margins formed during the Late Cretaceous. Flysch-type sediments were then deposited in a deep east-west basin. During the latest Cretaceous and Early Eocene, this basin underwent subduction towards the south. We propose that the present-day Pyrenees result from collision between a northern stable margin (Aquitaine Basin and Sub-Pyrenean Belt) and an active southern margin (Pyrenees proper). According to this interpretation, the pre-Mesozoic basement of the North Pyrenean Zone may represent the intermediate continental crust of the Cretaceous stable margin. Les auteurs proposent une nouvelle interprétation des Pyrénées. Après la période de ``rifting'' du Crétacé inférieur, deux marges continentales stables (de type Atlantique) se sont formées au Crétacé supérieur. Entre elles, un bassin profond orienté E-W accueillait des flyschs. Au Crétacé terminal et à l'Eocène inférieur, ce bassin a disparu par subduction vers le Sud, et la chaîne émergée actuelle résulte de la collision d'une marge stable septentrionale (Bassin d'Aquitaine et sillon sous-pyrénéen) et d'une marge active méridionale (Pyrénées proprement dites). Selon cette interprétation, le socleantémésozoïque de la zone nord-pyrénéenne appartient à la croûte intermédiaire de l'ancienne marge continentale crétacée.
Boillot Gilbert
Capdevila Raymond
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