Bacino di Aquitania

Nei domini geologici della Francia, il bacino di Aquitania occupa la porzione sudoccidentale.

Il bacino di Aquitania, che ha un'estensione di 66.000 km2, è il secondo più grande bacino sedimentario della Francia, dopo il bacino parigino. Si è formato tra il Mesozoico e il Cenozoico, e occupa una vasta porzione del quadrante sudoccidentale del paese.

Il suo nome deriva dalla regione francese dell'Aquitania.

Caratteristiche

Il basamento cristallino su cui poggia, formatosi durante l'orogenesi ercinica, si è appianato durante il Permiano e entrò poi in una fase di subsidenza all'inizio del Triassico. Nel bacino di Parentis e nel bacino subpireneo, entrambi sottobacini dell'Aquitania, il basamento è ricoperto da 11.000 m di sedimenti.

Il bacino di Aquitania ha una forma vagamente a imbuto, con l'apertura rivolta verso l'oceano Atlantico di cui segue per circa 330 km la pressoché dritta linea costiera, continuando poi nel mare lungo il margine continentale.

A sud è delimitato per 350 km dalla catena montuosa dei Pirenei; a sudest il bacino raggiunge la Seuil de Naurouze (o Seuil du Lauragais) tra la Montagne Noire a nord e Mouthoumet a sud. Appena a ovest di Narbona, al bacino si sovrappongono i sovrascorrimenti pirenaici. Il margine nordest del bacino è formato dagli affioramenti arcuati del Massiccio Centrale. A nordest, attraverso la Seuil du Poitou larga 100 km, il bacino si connette al bacino di Parigi. A nord il bacino confina con il basamento ercinico della Vandea, che è la parte più meridionale del Massiccio armoricano.

Bibliografia

  • (FR) Chantraine J, Autran A, Cavelier C, et al. Carte géologique de la France à l'échelle du millionème. (1996). BRGM. ISBN 2-7159-2128-4.
  • (FR) Gèze B & Cavaillé A. (1977). Aquitaine orientale. Guides géologiques régionaux. Masson. ISBN 2-225-44935-X.
  • (FR) Vigneaux M. (1975). Aquitaine occidentale. Guides géologiques régionaux. Masson. ISBN 2-225-41118-2.
  • (FR) Winnock E. (1996). Bassin d'Aquitaine. Contribution in the Encyclopaedia Universalis. ISBN 2-85229-290-4.

Voci correlate

Controllo di autoritàVIAF (EN) 246499584 · LCCN (EN) sh85006270 · GND (DE) 4002526-3 · J9U (EN, HE) 987007294022305171
  Portale Scienze della Terra: accedi alle voci di Wikipedia che trattano di scienze della Terra

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