The Cartersville district, which is bisected by the boundary between the Valley and Ridge and Piedmont provinces, contains thick lenses of thinly bedded, greenschist facies amphibolite in the southeastern (Piedmont) part that appear to correlate with lenses of carbonate-rich sedimentary rock in the Lower Cambrian Rome Formation to the northwest. Chemical analyses of the Cartersville amphibolites suggest that the magnitude and trend of their compositional variation can be best explained if the amphibolites were derived from a sediment containing minerals typical of the Lower Cambrian sedimentary environment in this area. This result casts doubt on the commonly assumed igneous parentage for the widespread amphibolites of the southeastern Appalachians.

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