Precipitation of minerals between detrital quartz and quartz overgrowths in sandstones
Meunier, Jean Dominique
European Journal of Mineralogy Volume 4 Number 6 (1992), p. 1401 - 1406
published: Dec 15, 1992
manuscript accepted: Mar 13, 1992
manuscript received: Sep 9, 1991
ArtNo. ESP147050406025, Price: 29.00 €
Abstract In the uranium-vanadium bearing sandstones from the Morrison Formation (Colorado Plateau, U.S.A.), coffinite and vanadium clays are located at the interface between detrital quartz grains and quartz overgrowths. Tyuyamunite, which results from recent alteration of uranium-vanadium minerals, also occurs below the quartz overgrowths. Effective porosity at the core-overgrowth interface is demonstrated by resin impregnation. Etching experiments using dilute HF indicate that the detrital grain-quartz overgrowth interface is preferentially corroded. Coffinite and vanadium clays may have precipitated by dissolution/replacement along the detrital grain-overgrowth interface. The interface between detrital grain and overgrowths may therefore be a site for the creation or destruction of microporosity in sandstone.