The influence of climate and topography on rock-fragment abundance in modern fluvial sands of the southern Blue Ridge Mountains, North Carolina. Grantham, J. H. Journal of Sedimentary Petrology, 1988.
The influence of climate and topography on rock-fragment abundance in modern fluvial sands of the southern Blue Ridge Mountains, North Carolina. [pdf]Paper  abstract   bibtex   
Chemical weathering influences the detrital composition of sand-size sediment derived from source areas subject to different amounts of precipitation in the Coweeta Basin. Of the grain types studied, rock fragments are most sensitive to chemical degradation; therefore, their abundance is the best indicator of cumulative weathering effects. In the Coweeta Basin, the intensity of chemical weathering is directly related to the climate via effective precipitation, whereas the duration of chemical weathering is inversely related to the topographic slope of the watershed. Therefore, soils in watersheds with low-relief and high discharge per unit area experience the most extensive chemical weathering, and sediments derived from these watersheds contain the lowest percentage of rock fragments.

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