Thermal maturity of the Swiss Molasse Basin: indications for paleogeothermal anomalies ?

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Reference

Thermal maturity of the Swiss Molasse Basin: indications for paleogeothermal anomalies ?

SCHEGG, Roland Albert

Abstract

Ce travail présente une étude de la maturation de la matière organique dans les sédiments de la Molasse du Plateau et de la Molasse subalpine en Suisse, et un essai de reconstitution de l'histoire thermique de l'avant-pays alpin au cours du Tertiaire. 136 échantillons de charbon ont été analysés. Leur pouvoir réflecteur moyen de la vitrinite (Rr) varie de 0.21 % à 0.97%.

La distribution de la réflectance de la vitrinite met en évidence un contrôle stratigraphique sur la maturation de la matière organique. Les valeurs moyennes varient de 0.39% Rr pour les échantillons de l'OSM à 0.53% Rr pour ceux de l'USM. Les courbes d'égal pouvoir réflecteur montrent une tendance régionale indiquant clairement une maturation croissante vers le front alpin. Cette tendance régionale est compliquée par des variations secondaires dans la Molasse du Plateau, qui semblent être liées à des accidents tectoniques. Ces derniers peuvent suivre les vallées principales (lac de Zürich). La modélisation thermique indique des paléotempératures maximales qui sont de l'ordre de 40, 70, 90 et 110 °C pour des valeurs de [...]

SCHEGG, Roland Albert. Thermal maturity of the Swiss Molasse Basin: indications for paleogeothermal anomalies ? Eclogae Geologicae Helvetiae, 1992, vol. 85, no. 3, Symposium on Swiss Molasse Basin, p. 745-764

DOI : 10.5169/seals-167031

Available at:

http://archive-ouverte.unige.ch/unige:154281

Disclaimer: layout of this document may differ from the published version.

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