Paleometeorización vs. Paleoalteración en la superficie de discordancia Proterozoico-Cámbrico en el Antiforme del Narcea

Abstract

Petrographic and geochemical characterization of the rocks underlying the Neoproterozoic-Cambrian angular unconformity in the eastern flank of the Narcea Antiform, provide an insight on the processes involved in the widespread ruhefaction present along this contact. The'data provide evidence of superposed events related to the sub-aerial weathering during the Precambrian-Cambrian boundary and a further alteration caused, probably,; by fluid circulation during the Variscan Orogeny