Geoquímica de las micas blancas detríticas de las rocas ediacarenses y cámbricas del Antiforme del Narcea (NO España)

Résumé

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.