Thermal maturity and modelling of Mesozoic and Cenozoic sediments in the south of the Rhine Graben and the Eastern Jura (Switzerland)

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Thermal maturity and modelling of Mesozoic and Cenozoic sediments in the south of the Rhine Graben and the Eastern Jura (Switzerland)

TODOROV, Ivaylo, SCHEGG, Roland Albert, WILDI, Walter

Abstract

Le but de cette étude est une reconstitution de l'histoire thermique de la région située à l'intersection entre le Fossé rhénan, formé par extension au cours du Tertiaire, et le Jura oriental, dominé par la compression. Cette reconstitution repose sur une analyse de la maturité de la matière organique dispersée, déterminée par la mesure de la réflectance de la vitrinite, sur des échantillons provenant d'affleurements et de forages. Les principales lithologies concernées sont des pélites d'âge mésozoïque et des grès tertiaires riches en débris de plantes. Les valeurs de réflectance de la vitrinite varient entre 0.24% Rr et 0.54% Rr pour les sédiments du Tertiaire, entre 0.40% Rr et 0.70% Rr pour le Jurassique, et entre 0.49% Rr et 0.80% Rr pour le Trias supérieur. Les analyses de pyrolyse Rock-Eval confirment ces valeurs. Certaines formations, et notamment les schistes à posidonies, apparaissent comme des roches mères. La modélisation thermique de la maturité mesurée indique que celle-ci a été atteinte au cours d'une phase de haute température au Tertiaire. Les paléogradients thermiques [...]

TODOROV, Ivaylo, SCHEGG, Roland Albert, WILDI, Walter. Thermal maturity and modelling of Mesozoic and Cenozoic sediments in the south of the Rhine Graben and the Eastern Jura (Switzerland). Eclogae Geologicae Helvetiae, 1993, vol. 86, no. 3, p. 667-692

DOI : 10.5169/seals-167258

Available at:

http://archive-ouverte.unige.ch/unige:153970

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

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Thermal maturity and modelling of Mesozoic and Cenozoic sediments in the south of the Rhine Graben and the Eastern Jura (Switzerland)

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