Abstract
ABSTRACT Ankerite, a dolomite altered by isomorphous cation substitution, is the primary carbonate mineral in Mahogany Zone oil shales of the Green River Formation in Colorado and Utah. X-ray diffraction spacings determined on 10 composite samples representing the zone over a broad geographic area are shifted from those of unsubstituted dolomite to spacings very similar to an ankerite. Substitution of Fe++ for Mg++ in these samples was insufficient to account for the large shifts detected. Isomorphous substitution of Sr++ for Ca++, suggested as contributing to the shift in spacing, was strongly supported by correlation significant to more than 99 percent between d104 spacing shift and the proportions of substitution of Fe++ for g++ and Sr++ for Ca++ in these samples.
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