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Journal of the Geological Society; 1980; v. 137; issue.4; p. 431-441;
DOI: 10.1144/gsjgs.137.4.0431
© 1980 Geological Society of London

Article

Sorting mechanisms in coarse-grained alluvial sediments: fresh evidence from a basalt plateau gravel, Kenya

L. E. Frostick & I. Reid

An analysis of the Koobi Fora Plateau Gravel, N Kenya, reveals clear-cut but contradictory patterns of sedimentary sorting. Basalt particles form the major constituent and decrease in diameter downstream at a rate of 3 mm km-1, while feldspar is virtually eliminated from the sediment within 30 km. But over the same ground, agate particles increase in size more than 4-fold while the sphericity of quartzite clasts decreases. These apparently conflicting sorting patterns are used to formulate a clearer understanding of the sedimentary processes that operate in widespread gravel deposits. The nature of the basalt particle size-gradient is contrasted with those published for alluvial fans and simple undivided channels to suggest diagnostic features that distinguish braided channel deposits.





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