Abstract
Calcareous ooids from modern and ancient marine and non-marine settings are highly variable owing to differences in initial cortical composition and fabric. Compositionally, modern ooids consist of low-magnesian calcite (0%–5% MgCO3), high-magnesian calcite (10%–18% MgCO3) and aragonite with more than one phase commonly occurring within an individual cortex (e.g, Land et al. 1979). The primary mineralogy of ancient (now low-magnesian calcite) cortices was also variable (e.g., Kettenbrink and Manger 1971), although the initial magnesium content of ancient calcite ooids is undocumented and the relative abundance of aragonite versus calcite phases has not been constant throughout Phanerozoic time (e.g., MacKenzie and Pigott 1981).
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© 1983 Springer-Verlag Berlin Heidelberg
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Medwedeff, D.A., Wilkinson, B.H. (1983). Cortical Fabrics in Calcite and Aragonite Ooids. In: Peryt, T.M. (eds) Coated Grains. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-68869-0_9
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DOI: https://doi.org/10.1007/978-3-642-68869-0_9
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