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title of the reference :
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Sedimentary record of sea level changes and associated organic-rich facies on the southern Tethyan margin.
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Publication Date:
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1998
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Author :
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Soussi Mohamed, Abbes Chedli, Belayouni Habib
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Catalogue type :
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Livre
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Catalogue reference :
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Sedimentary record of sea level changes and associated organic-rich facies on the southern Tethyan margin. The Upper Triassic of central Tunisia. Recent sedimentologic study performed on the Upper Triassic mixed carbonate-evaporite-siliciclastic series in central Tunisia has led to characterize five major trangressive-regressive sequences. The basal carbonate terms of these sequences were deposited on retrogradational shallow marine platform during the Carnian and Rhaetian relative sea level rises. Conversely, the siliciclastic (shales and siltstones) and evaporitic terms linked to regressive episodes were deposited under transitional to margino-littoral conditions. The correlation of these sequences, mainly controlled by eustatic fluctuations, with the ABSAROKA global third order cycles (deposional sequences) reveals the presence, in central Tunisia, of an additional sequence within the Carnian time interval. Within the Carnian transgressive faciès, organic-rich carbonates and shales were deposited during enhanced anoxic conditions. These organic-rich facies of central Tunisia represent the sedimentary record of an Upper Triassic anoxic event on the southern tethyan margin. Trias supérieur ; sédimentologie ; faciès ; carbonate ; évaporite ; transgression ; régression ; Carnien ; Tunisie ; Tunisie Centrale ; Chabet El Ataris ; Ain Morra ; J. Loridga ; J. Rheouis Belayouni Habib Abbes Chedli Soussi Mohamed Sédimentologie
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Indexation decimale :
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Sédimentologie
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Keywords :
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Trias supérieur ; sédimentologie ; faciès ; carbonate ; évaporite ; transgression ; régression ; Carnien ; Tunisie ; Tunisie Centrale ; Chabet El Ataris ; Ain Morra ; J. Loridga ; J. Rheouis
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Summary :
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Recent sedimentologic study performed on the Upper Triassic mixed carbonate-evaporite-siliciclastic series in central Tunisia has led to characterize five major trangressive-regressive sequences. The basal carbonate terms of these sequences were deposited on retrogradational shallow marine platform during the Carnian and Rhaetian relative sea level rises. Conversely, the siliciclastic (shales and siltstones) and evaporitic terms linked to regressive episodes were deposited under transitional to margino-littoral conditions. The correlation of these sequences, mainly controlled by eustatic fluctuations, with the ABSAROKA global third order cycles (deposional sequences) reveals the presence, in central Tunisia, of an additional sequence within the Carnian time interval. Within the Carnian transgressive faciès, organic-rich carbonates and shales were deposited during enhanced anoxic conditions. These organic-rich facies of central Tunisia represent the sedimentary record of an Upper Triassic anoxic event on the southern tethyan margin.
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