Abstract

The radial coatings of Holocene ooids from Baffin Bay, Texas, are Mg-calcite, whereas the tangential and micritic coatings are aragonite. Centrifugally deposited ooid coatings are similar in many respects to centripetally deposited marine cements. The reason(s) for the mineralogical and textural variation in these apparently inorganic carbonate precipitates are not certainly known, but the rate of nucleation and precipitation, degree of agitation and presence of certain types of organic compounds appear to be the most likely explanations.

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