Abstract
Radial/concentric and twinned/sparry ooids from the upper Belt Supergroup originally formed as mixed Mgcalcite and aragonite, and aragonite. Textural evidence suggests that Mgcalcite ooids may have formed along with the ooids having an original aragonite mineralogy. Strontium concentrations of 2400 to 2900 ppm support an aragonitic precursor to the twinned/sparry ooids, and Sr values of 2500 ppm strongly suggest that the radial/concentric ooids had an aragonitic component in addition to the Mgcalcite suggested by the preserved fabric. Trace element (Mn, Mg, Fe, and Sr) values of ooids and early carbonate cements suggest that diagenetic trends for these Proterozoic carbonates are similar to those established for their Phanerozoic and Archean counterparts. Mg, Fe, and Mn increase and Sr decreases with successively later carbonate phases.
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