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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 44 (1974)No. 3. (September), Pages 921-927

Origin and Significance of Grapestone, Bahama Islands

H. Dale Winland, R. K. Matthews


Bahaman grapestone is produced by cementation of recrystallized ooids in the marine environment. Initial binding of grains is accomplished by growth of algae and encrusting forams in the substrate. Later cementation and infilling of the composite may be due to continued growth of these organisms in the interior of the aggregate and to chemical or biochemical precipitation of cement. Data indicate the recrystallized ooids making up grapestone were formed at an earlier stage in sedimentation as the sea transgressed onto the Bahaman Platform at the end of the last glacial lowstand. Thus, grapestone is produced through a sequence of depositional conditions rather than a single set of conditions. Given a supply of firm grains, uneven water turbulence, high water circulation rates, and very low sedimentation rates favor the formation of grapestone.

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