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Comptes Rendus Géoscience
Volume 339, n° 9
pages 601-612 (août 2007)
Doi : 10.1016/j.crte.2007.07.010
Received : 7 December 2006 ;  accepted : 9 July 2007
The Bajocian-Kimmeridgian Jurassic sedimentary cycle of eastern Sardinia: Stratigraphic, depositional and sequence interpretation of the new Baunei Group'
Le cycle sédimentaire Bajocien-Kimméridgien en Sardaigne orientale : interprétation stratigraphique, dépositionnelle et séquentielle du « groupe de Baunei », nouvellement créé
 

Luca G. Costamagna , Sebastiano Barca, Luciano Lecca
Dipartimento di Scienze della Terra, Via Trentino 51, 09127 Cagliari, Italy 

Corresponding author.
Abstract

In eastern Sardinia, the first Jurassic sedimentary cycle (Bajocian-Kimmeridgian) develops in response to the opening of the Alpine Tethys Ocean. Starting during the Bajocian (Middle Jurassic), over a horst-and-graben system initially drowning to the northeast, at first siliciclastic sediments take place, related to continental to transitional environments. In time, they are gradually followed by marine carbonate, assigned to inner to outer ramp deposits. Afterwards, the latter, in their turn, become shallow; they are newly covered with an inner ramp lithofacies. The Kimmeridgian-Tithonian unconformity ends the cycle. Therefore, this sedimentary cycle as a whole can be interpreted as a transgressive-regressive megasequence linked to tectono-eustatic factors. All the pertaining stratigraphic units have been included within the Baunei Group', newly described. A comparison with the neighbouring areas, with particular regards to the Jurassic series of the Corsica, has been made, attempting to improve the reconstruction of this part of the Tethyan Ocean Western margin.

The full text of this article is available in PDF format.
Résumé

En Sardaigne orientale, le premier cycle sédimentaire jurassique se développe dans le contexte de l'ouverture de la Téthys alpine. À partir du Bajocien, sur un système de horsts et grabens en cours d'effondrement vers le nord-est, se mettent d'abord en place des sédiments continentaux, suivis par des sédiments marins carbonatés de rampe interne et externe, à leur tour recouverts par des sédiments de rampe interne. La discontinuité du Kimméridgien-Tithonien termine ce cycle sédimentaire, dont la totalité peut être interprétée comme une séquence transgressive-régressive, contrôlée par des phénomènes tectono-eustatiques. L'ensemble des formations liées à ce cycle sédimentaire constitue le « groupe de Baunei », nouvellement créé. Une comparaison a été faite avec les secteurs jurassiques les plus proches, en particulier avec celui de Corse, en essayant d'améliorer la reconstruction de ces parties de la marge occidentale de l'océan Téthys.

The full text of this article is available in PDF format.

Keywords : Sedimentology, Stratigraphy, Carbonate ramp, Jurassic, Tethys, Sardinia

Mots clés : Sédimentologie, Stratigraphie, Rampe carbonatée, Jurassique, Téthys, Sardaigne




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