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title of the reference :  Silicification of sulphate evaporites and their carbonate replacements in Eocene marine sediments, Tunisia :
Publication Date: 2006
Author : Henchiri Mohsen, Slim-Shimi Najet
Catalogue type : Livre
Catalogue reference : Vol. 53 (NLD) Sedimentology Vol. 53 Silicification of sulphate evaporites and their carbonate replacements in Eocene marine sediments, Tunisia : two diagenetic trends. Samples of chert nodules, diagenetic carbonates and evaporites (gypsum/anhydrite) collected from the gypsiferous limestones of the Kef Eddour Member (Ypressian-Priabonian) near Metlaoui and Sehib (Tunisia) show selective silicification with great variety in the silicified by products. Which support an organic origin for the carbon, carbonates replaced evaporites microbially through bacterial sulphate reduction. The microbial diagenitic replacement of evaporites (baclerial sulphate reduction) by carbonates (calcite, aragonite and dolomite) favoured silica replacement of carbonates rather than evaporites.Silica replaced carbonates on a volume for volume basis, yielding a more siliceous groundmass and accounting for 90-95 % of the nodules. référ. bibliogr. nodule ; carbonate ; évaporite ; Quartz ; géode ; silicification ; sulfate ; phosphate ; Formation Metlaoui ; Formation Sehib ; Tunisie ; Tunisie Sud occidentale ; Gafsa ; Metlaoui ; M'Dhilla ; J. Sehib ; Jellabia Henchiri Mohsen Slim-Shimi Najet Géochimie
Indexation decimale : Géochimie
Keywords : nodule ; carbonate ; évaporite ; Quartz ; géode ; silicification ; sulfate ; phosphate ; Formation Metlaoui ; Formation Sehib ; Tunisie ; Tunisie Sud occidentale ; Gafsa ; Metlaoui ; M'Dhilla ; J. Sehib ; Jellabia
Summary : Samples of chert nodules, diagenetic carbonates and evaporites (gypsum/anhydrite) collected from the gypsiferous limestones of the Kef Eddour Member (Ypressian-Priabonian) near Metlaoui and Sehib (Tunisia) show selective silicification with great variety in the silicified by products. Which support an organic origin for the carbon, carbonates replaced evaporites microbially through bacterial sulphate reduction. The microbial diagenitic replacement of evaporites (baclerial sulphate reduction) by carbonates (calcite, aragonite and dolomite) favoured silica replacement of carbonates rather than evaporites.Silica replaced carbonates on a volume for volume basis, yielding a more siliceous groundmass and accounting for 90-95 % of the nodules.
Exemplaries : TU2188


 

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