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- W4250347941 abstract "Sanidine ages of various coal tonstein or tuff beds from six Central European Upper Carboniferous deposits have been determined using the 40Ar/39Ar stepwise heating method. All the sanidine samples show 40Ar/39Ar release spectra with well-defined plateaus. The measured ages are interpreted as the sedimentation ages of the coal tonsteins and tuffs. The results of these age determinations relate to the Carboniferous time scale and the authors thus suggest new age values for the Upper Carboniferous stage boundaries, which are ∼ 5–10 Ma higher than those proposed previously: base of Namurian: 326 Ma, base of Westphalian: 315 Ma, base of Stephanian: 306 Ma, base of Autunian: 300 Ma. Des âges sur sanidine de divers niveaux de tuffs ou de tonsteins charbonneux, échantillonnés dans des dépôts du Carbonifère supérieur d'Europe Centrale, ont été déterminés en utilisant la technique de chauffage par étape 40Ar/39Ar. Tous les échantillons de sanidine montrent des spectres de dégazage 40Ar/39Ar avec un plateau bien défini. Les âges calculés sont interprêtés comme des âges de sédimentation des tuffs et tonsteins. Les résultats de ces mesures sont en liaison avec l'échelle stratigraphique du Carbonifère et permettent de proposer de nouvelles valeurs pour les limites d'étages 5 à 10 Ma plus anciennes que celles préalablement admises: base du Namurien: 326 Ma, base du Westphalien: 315 Ma, base du Stéphanien: 306 Ma, base de l'Autunien: 300 Ma." @default.
- W4250347941 created "2022-05-12" @default.
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- W4250347941 date "1986-11-30" @default.
- W4250347941 modified "2023-10-14" @default.
- W4250347941 title "Ar/Ar Ages of tonstein and tuff sanidines: New calibration points for the improvement of the upper carboniferous time scale" @default.
- W4250347941 doi "https://doi.org/10.1016/0168-9622(86)90093-x" @default.
- W4250347941 hasPublicationYear "1986" @default.
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