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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 53 (1983)No. 4. (December), Pages 1169-1173

Cold-water Spherical Grains from a Fresh-Water Drainage Pipe, Gordon Dam, Tasmania, Australia

C. Prasada Rao, I. H. Naqvi

ABSTRACT

A spectrum of spherical grains ranging from spherulites through oolites, pisolites to grapestones, formed at an average temperature of about 8° C, were observed in a fresh-water dam foundation drainage pipe. These low-magnesium calcite spherical grains each have a thick cortex with or without a nucleus. The cortex is characterized by concentric laminae and fibro-radiating rhombic to sheetlike fibrous crystals. Nuclei are composed of coarser crystals than those in the cortex. Calcium-rich solutions originating from foundation grout reacted with atmospheric CO2 to form these spherical grains. Nucleation and the inorganic growth of these spherical grains appear to be related to the water-flow rate.


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