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title of the reference :
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Stratigraphic correlation of Keathley anomaly, magnetostratigraphy of Tunisia
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Publication Date:
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1979
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Author :
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Nairn Alan E.M.
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Catalogue type :
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Livre
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Catalogue reference :
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Vol.63,N°3 (USA) AAPG Bull. Vol.63,N°3 Stratigraphic correlation of Keathley anomaly, magnetostratigraphy of Tunisia Corrélation stratigraphique de l'anomalie de Keathley, magnétostratigraphie de la Tunisie abstact A magnetostratigraphic study of upper Mesozoic limestone sections in northeastern Tunisia combined with a study of existing radiometric data leads to a slight modification in the correlation of the marine magnetic anomaly sequence with the biostratigraphic scale. We conclude that the base of the Keathley sequence (M25)lies in the Upper Oxfordian with M22 being within the L. Kimmeridgian. The upper part of our section uppermost Campanian - Maestrichtian (pars)matches with data of Lowrie and Alvarez (1977a,b)and Hanna (1973). We also find Percherski's L. Santonian reversed interval. There in a tentative suggestion that the Cretaceous quiet interval, from 77 to 112 m.y. may contain a number of short duration. The nature of our samples prevents verification of this. The geomagnetic pole position for the Upper Jurassic is 62.OS 15.9E A95 = 7.9. The ammonitico rosso sections suggest correlation which implies that although reduced in thickness there are no major lacunae in the sections. paléomagnétisme ; corrélation ; Jurassique supérieur ; Crétacé supérieur ; Tunisie ; Tunisie Nord Orientale Nairn Alan E.M. Stratigraphie
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Indexation decimale :
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Stratigraphie
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Keywords :
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paléomagnétisme ; corrélation ; Jurassique supérieur ; Crétacé supérieur ; Tunisie ; Tunisie Nord Orientale
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Summary :
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A magnetostratigraphic study of upper Mesozoic limestone sections in northeastern Tunisia combined with a study of existing radiometric data leads to a slight modification in the correlation of the marine magnetic anomaly sequence with the biostratigraphic scale. We conclude that the base of the Keathley sequence (M25)lies in the Upper Oxfordian with M22 being within the L. Kimmeridgian. The upper part of our section uppermost Campanian - Maestrichtian (pars)matches with data of Lowrie and Alvarez (1977a,b)and Hanna (1973). We also find Percherski's L. Santonian reversed interval. There in a tentative suggestion that the Cretaceous quiet interval, from 77 to 112 m.y. may contain a number of short duration. The nature of our samples prevents verification of this. The geomagnetic pole position for the Upper Jurassic is 62.OS 15.9E A95 = 7.9. The ammonitico rosso sections suggest correlation which implies that although reduced in thickness there are no major lacunae in the sections.
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Exemplaries :
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TU1147
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