Magnetostratigraphy of the Toarcian stratotype sections at Thouars and Airvault (Deux-Sèvres, France) |
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| Authors: | Bruno Galbrun Jean Gabilly Lopold Rasplus |
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| Institution: | Bruno Galbrun, Jean Gabilly,Léopold Rasplus |
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| Abstract: | Magnetostratigraphic study of the Toarcian type sections of Thouars and Airvault (Deux-Sèvres, France) has yielded two reliable magnetic polarity sequences. Most samples were treated by mixed cleaning: thermal demagnetization (250°, 300° or 350°C) and subsequent alternating field demagnetization. Polarity intervals are easily identified and correlate well between the two sections using the biostratigraphic data provided by the detailed standard ammonite zonation of the Toarcian stage. The polarity sequence extends from ammonite horizon V (Pseudoserpentinum horizon,Serpentinus zone) to horizon XXV (Subcompta horizon,Aalensis zone); it shows 5 reversed and 5 normal polarity magnetozones. |
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