Geologic descriptionComplex intergrowths of limonite (replacing pyrite and chalcopyrite) and drusy comb-quartz are present in a tabular body of silicified breccia 2 feet-wide. Abundant secondary minerals include malachite, chrysocolla, azurite, cerussite, and duftite(?). This is at the silicified contact between marble and amphibolite schist and there is minor silicified gouge in the breccia. This locality, and several others in this part of the Bendeleben A-4 quadrangle, are in high grade metamorphic rocks that are structurally above or peripheral to the crosscutting Pargon pluton. The Pargon pluton is mostly granodiorite and assumed to be Cretaceous in age (Till and others, 1986). It was emplaced at shallower depths than the more deep-seated Bendeleben pluton to the east. The metamorphic rocks peripheral to the western Pargon pluton are also intruded by small, felsic dikes and plugs including quartz porphyry and muscovite granite. |
