Oolithes remaniées, brisées et régénérées dans le Mississippien des chaînes frontales, Alberta Central, Canada

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Oolithes remaniées, brisées et régénérées dans le Mississippien des chaînes frontales, Alberta Central, Canada

CAROZZI, Albert V.

Abstract

Des oolithes curieuses provenant de la formation de Turner Valley (Mississippien) des Chaînes frontales de l'Alberta central sont décrites en détail. Elles montrent de fines couches concentriques fibro-radiées dues à des phénomènes normaux d'oolithisation alternant avec des zones de calcite sombre cryptocristalline, d'épaisseur variable, correspondant à l'incorporation d'une calcilutite. Ce matériel calcitique indifférencié forme d'ailleurs aussi bien le noyau original des oolithes que la roche finale dans laquelle on les trouve dispersées. La structure interne particulière des oolithes décrites témoigne de remaniements faisant partie d'un cycle de phénomènes sédimentaires qui s'est répété au moins quatre fois. Ce cycle est le suivant: oolithisation — dépôt dans une calcilutite — remaniement. Les oolithes soumises à ces conditions particulières ont souvent été affectées par des actions dynamiques syn-sédimentaires qui ont accompagné ou immédiatement suivi les processus d'oolithisation.

Les impacts ont soit fissuré les oolithes sans séparer les corps originaux en fragments distincts, [...]

CAROZZI, Albert V. Oolithes remaniées, brisées et régénérées dans le Mississippien des chaînes frontales, Alberta Central, Canada. Archives des Sciences, 1961, vol. 14, no. 2, p.

281-296

DOI : 10.5169/SEALS-739573

Available at:

http://archive-ouverte.unige.ch/unige:126267

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

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