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• W268520935 abstract "The study of weathering profiles developed over different bedrock types in the Elberton, GA area gives insights to landscape evolution and the long-term mass transfer of elements from land to the oceans. Mineralogical and textural zoning of weathering profiles are primarily controlled by the nature of the parent rock and landscape position. The extent of vegetation cover and climate has probably changed over long periods of time. Mineral and elemental abundances, and bulk density measurements reveal that the greatest mass loss occurs near the bedrock-saprolite interface. Exposure ages for the Elberton area are poorly constrained, however, cosmogenic nuclide studies of nearby localities the Piedmont suggests quartz near the surface has been exposed for about 125,000 years and uplift and denudation rates are in equilibrium; at about 15 m per million years. Estimates of the long-term chemical weathering rate (i.e., mass loss over 10’s of thousands of years) for the Piedmont’s felsic terrain indicate a rate of about an order of magnitude less than that for a similar felsic terrain in a tropical climate. Long-term changes in weathering rates are likely linked to long-term changes in climate. Weathering horizons locally developed on felsic terrains in the Elberton, GA area (i.e., granites and gneisses) tend to be thick (~5 to 25 m), while horizons developed on mafic and ultra-mafic terrains tend to be thin (~1 to 5 m). Granite weathering is not only “top down”, but also “bottom up”, when chemical attack initiates along exfoliation planes. The extent of postemplacement metamorphism is also a factor, with deformed granitic rocks appearing to be more weatherable than non-deformed granites. The production and movement of clay minerals in all weathering horizons occurs via a dissolution and precipitation process. Felsic terrains with abundant organic matter tend to develop gibbsite and authigenic hydroxy-interlayered vermiculite in the A-horizon and poorly-ordered kaolinite and halloysite in all horizons. Mafic and ultramafic terrains also tend to produce kaolin group minerals in all horizons and smectitic clays in the C-horizon. The concept of a natural, wholly residual weathering profile on the eastern Georgia Piedmont is likely more the exception than the rule. Soil A-horizons often contain excess Si and Al, gained from wind-blown and colluvial influxes, in addition to inheriting residual veneers from previously weathered country rock or fluvial sediments." @default.
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• W268520935 date "2005-01-01" @default.
• W268520935 modified "2023-09-23" @default.
• W268520935 title "WEATHERING PROFILES DEVELOPED ON GRANITIC, MAFIC, AND ULTRAMAFIC TERRAINS IN THE AREA OF ELBERTON, GEORGIA" @default.
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