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Aragonite and the Genesis of Carbonates in Mahogany Zone Oil Shales of Colorado's Green River Formation.
NTIS: PB 227 187 :21 pages
Aragonite, co-occurring with calcite and dolomite as matrix minerals, has been discovered in mahogany zone oil shales of Colorado's Eocene Green River Formation, posing puzzles on the geochemical patterns of their separate origins, reasons for their simultaneous existence, and their interrelation. The presence of aragonite is demonstrated by x-ray diffraction. Amounts of aragonite and dolomite are significantly and inversely related, but the calcite quantity is essentially independent of either aragonite or dolomite quantity. A geochemical pattern outlining the deposition conditions that created the Green River Formation oil shale is postulated from characteristics of the oil shale. The development of the three separate carbonates--aragonite, calcite, and dolomite--the inverse relationship between aragonite and dolomite, and the independence of amounts of calcite and the other two carbonates are shown to be natural consequences of this oil- shale genesis pattern.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 227 187
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division