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Durham University

Department of Earth Sciences

Profile

Publication details for Professor Yaoling Niu

Niu, Yaoling & Lesher, C.M. (1991). Hydrothermal alteration of mafic metavolcanic rocks and genesis of Fe-Zn-Cu sulfide deposits, Stone Hill district, Alabama. Economic Geology 86(5): 983-1001.

Author(s) from Durham

Abstract

Fe-Zn-Cu sulfide mineralization in the Stone Hill district of the northern Alabama Piedmont is hosted by zones of felsic schist and garnet schist within the Ketchepedrakee Amphibolite. The felsic schist is characterized by quartz-pyrrhotite-biotite-muscovite-plagioclase-rutile-sphalerite + or - chalcopyrite + or - pyrite + or - hornblende + or - epidote assemblages and the garnet schist is characterized by garnet-hornblende-quartz-biotite-pyrrhotite-chalcopyrite + or - sphalerite + or - pyrite + or - chlorite + or - actinolite + or - calcite assemblages. Both schists are well banded and highly deformed. The felsic schist locally contains ellipsoidal, polycrystalline aggregates of quartz-feldspar-biotite that superficially resemble sedimentary clasts but clearly formed tectonically by boudinage of felsic bands. The following petrographic and geochemical data and field relationships suggest that both schists are hydrothermally altered basalt (the precursor of the Ketchepedrakee Amphibolite): (1) the felsic and garnet schist units are very localized lenses (