Étude du remplacement diagénétique du quartz détritique par les carbonates dans les dolomies cambriennes

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Étude du remplacement diagénétique du quartz détritique par les carbonates dans les dolomies cambriennes

CAROZZI, Albert V., PAGE, Norman J.

Abstract

Cette étude quantitative de la corrosion des grains de quartz détritique dans des dolomies du Cambrien supérieur du New-Jersey a été effectuée par deux méthodes. La première correspond à l'établissement des courbes cumulatives des grains de quartz et des grains carbonatés lithiques qui leur sont associés par microfaciès et à leur comparaison avec les courbes théoriques calculées. Les différences observées démontrent la réalité de la corrosion ainsi qu'une absence de certaines classes granulométriques et conduisent, par exemple, à une valeur de 44,4% en volume pour des grains de quartz d'un diamètre original de 0,18 mm.

Cette corrosion, importante volumétriquement, a été atteinte par une modification de la sphéricité de l'ordre de 0,15 qui n'affecte pratiquement pas les mesures de clasticité. La seconde méthode correspond à la mesure directe d'un indice de corrosion défini par la différence entre la surface projetée d'un grain et celle du plus petit cercle circonscrit exprimée par un pourcentage de ce dernier. Les courbes de variation stratigraphique de l'indice de corrosion montrent une [...]

CAROZZI, Albert V., PAGE, Norman J. Étude du remplacement diagénétique du quartz

détritique par les carbonates dans les dolomies cambriennes. Archives des Sciences, 1961, vol. 14, no. 3, p. 461-491

DOI : 10.5169/SEALS-739586

Available at:

http://archive-ouverte.unige.ch/unige:126265

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

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Étude du remplacement diagénétique du quartz détritique par les carbonates dans les dolomies cambriennes

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