Detrital minerals provenance studies have become a common tool to decipher paleogeographic scenarios in
many orogenic belts. Together with the geochronological single mineral dating, the geochemistry of detrital
minerals can provide insights on the source rocks of the studied detrital minerals. In this paper we study the
chemistry of the detrital micas from two samples of Ediacaran and Cambrian age. The obtained results provide
an almost identical chemical signature for the studied detrital white micas in both samples. The fengitic vector
conditions the Fe+Mg proportion with some influence of the ferrimuscovitic vector mainly in the cambrian
sample. The results point towards an origin of the sediments from LP igneous or metamorphic source rocks