GEOCHEMICAL ANALYSIS AND GLACIAL DEPOSITIONAL ENVIRONMENTS OF TWO UNIQUE LATE PALEOZOIC UNITS LOCATED IN WITMARSUM, PARANÁ STATE, BRAZIL
The cryptocrystalline siliceous unit occurs at a distinct stratigraphic horizon and is interbedded with lenses of (presumed) glaciogenic sands. Further examination of the contact between the cryptocrystalline siliceous unit and the sand lenses will provide better insight on these glacial deposits. Illustrator images display the contact between the interbedded lenses of fine grained microcrystalline quartzite and quartz rich sand inclusions showing possible syndepositional soft-sediment deformation.
The fourth location contains a new amorphous shale unit discovered near the city of Palmeira, Paraná State, Brazil 20 km east of Witmarsum. This new unit occurs lower in the stratigraphic record (at the base of the Itararé Subgroup) but has characteristics that are similar to the cryptocrystalline siliceous unit described above.
Research for this study was funded by a grant from the N.S.F.-R.E.U Program (NSF-EAR 1262945)