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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 37 (1967)No. 3. (September), Pages 818-828

Winnowing--An Important Process in the Concentration of the Stairway Sandstone (Ordovician) Phosphorites of Central Australia

Peter J. Cook

ABSTRACT

Pelletal phosphorites occur in the Ordovician Stairway Sandstone of the Amadeus Basin. They commonly contain abundant detrital quartz grains that are markedly finer grained than the detrital quartz which encloses the Previous HitphosphaticNext Hit pellets. It can be shown that after the phosphate pellets were formed the sediments were winnowed, the fines removed, and only the coarsest quartz grains and the Previous HitphosphaticTop pellets and nodules remained.


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