1. Les sédiments du Dévonien de Saïda (Algérie nord occidentale): Nature et genèse.
- Author
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BOUGARA, Mohamed, BELKEBIR, Lahcene, and BOULVAIN, Frédéric
- Subjects
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FACIES , *STRATIGRAPHIC geology , *CONTINENTAL slopes , *EMBANKMENTS , *DEVONIAN Period , *SEDIMENTS - Abstract
A detailed analysis of sedimentary facies and sequences of the Boukourdène reference section allows linking these to the prevailing palaeoenvironmental conditions within a segment of the Hercynian belt during the Devonian. Main facies may be classified into three groups: - turbidite facies (channels and levees); - debris flows facies (poorly developed lobes); - bottom current facies. The channel-levee system forms a globally retrograding prism. The influence of subsidence is suggested by N110°E extensional synsedimentary faults. Between the channel-levee units, mass flows initiated on a continental slope are observed. Sediment accumulation resulted from a N130-155°E unidirectional supply, derived from the reworking of clastic rocks. This suggests some contemporaneous erosion of a cordillera which was part of the Panafrican basement of the Saharian Atlas. [ABSTRACT FROM AUTHOR]
- Published
- 2012