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Dolomitized Glauconite Granules: A New Kind of Peloid From Proterozoic Strata of Central India
Ajit Bhattacharyya, S. K. Chanda, Gerald M. Friedman
Peloids, made up of homogeneous, structureless dolomicrite ranging in size from -3.0 to 1.5 , with the modal class between -1 to -0.5 , occur in the basal dolomite (Lower Proterozoic) of the Vindhyan Supergroup in central India. The peloids are discrete sedimentary grains, and morphologically they may be polylobate, tabular, sickle-shaped, or rounded/ovoidal with deep V-shaped cracks occurring along their periphery and converging inward. The rare presence of islands of glauconite within the peloids, together with other features, suggest that these dolomitized peloids are products of near-complete replacement of granule-size articles of glauconite.
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