Zircon U-Pb age constraints on the Paleoproterozoic sedimentary basementn of the Ediacaran Porongos Group, Sul-Riograndense Shield, southernn Brazil

摘要

Thick quartzites record significant information on cratonic environments during long geological periods. The capacity to resist weathering and deformation turn the quartzite covers especially useful in the provenance studies of Precambrian basins. Provenance of 194 detrital zircon grains from two samples of thick quartzite cover on the Paleoproterozoic Encantadas Complex displays mostly Paleoproterozoic (95%) and minor Archean (5%) sources. The results indicate that sediments were derived from t