American Journal of Science, 1992. Paper abstract bibtex
The geochemical mass balance of alkali and alkaline-earth elements in a southern Blue Ridge watershed underlain by amphibolite (Carroll Knob Complex Watershed 3 of Coweeta Hydrologic Laboratory) can be explained by weathering of plagioclase (oligoclaseandesine), hornblende (ferroan pargasite), biotite weathering rates are similar to previously calculated rates for similar mineral in the surrounding gneissic/schistose watersheds. However, the similarity of feldspar weathering rates despite significant differences in modal abundance suggests that feldspar in the Carroll Knob Complex is somewhat less reactive than is plagioclase in the surrounding rocks. Hornblende and plagioclase weathering rates in Coweeta Watershed 3 are approximately equal, consistent with experimentally determined rates and empirical weathering series.