Magnetostratigraphy of the Toarcian stratotype sections at Thouars and Airvault (Deux-Sèvres, France)

Details Magnetostratigraphy of the Toarcian stratotype sections at Thouars and Airvault (Deux-Sèvres, France) Magnetostratigraphy of the Toarcian stratotype sections at Thouars and Airvault (Deux-Sèvres, France)

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988e%26psl..87..453g&link_type=abstract

Earth and Planetary Science Letters, Volume 87, Issue 4, p. 453-462.

Computer Science

19

Scientific paper

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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