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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 56 (1986)No. 4. (July), Pages 480-485

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 ^phgr, with the modal class between -1 ^phgr to -0.5 ^phgr, 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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