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L'âge radiométrique du Miocène inférieur en Europe Occidentale et Centrale |
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| Authors: | G S Odin J C Hunziker C R Lorenz |
| Institution: | 1. Laboratoire de Géologie des Bassins Sédimentaires - Groupe de Géochimie Sédimentaire et C. N. R. S., Université Paris VI-4, Place Jussieu, 75230, Paris Cédex 05, France 2. Institut de Minéralogie et Pétrographie, Sahlistr. 6, CH-3012, Berne, Suisse 3. Départment de Géologie Structurale, Université Paris VI, L. A. - C. N. R. S. no. 145, 75230, Paris Cédex 05, France |
| Abstract: | Systematic research over years on datable horizons of lower Miocene age has led to an election of nine glauconite samples suitable for dating work. The chosen glauconites come from various regions of the tethys. Following careful sedimentological as well as stratigraphical studies the K-Ar ages of these glauconites were measured. The interpretation of the apparent ages found takes into consideration sedimentation, mineralogical quality and present knowledge of the genesis of the green glauconite pellets. The presented data allow to fix the basis of the Miocene at about 21–22 m. y. and the boundary of Aquitanian-Burdigalian at 18 m. y. The K-Ar data on glauconites presented here are in good agreement with newer measurements of other authors on high temperature minerals of the same age span. |
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