Nuevos datos sobre estratigrafía del Ordovícico y estructura varisca en el Macizo de Santa María la Real de Nieva

Abstract

We present a new geological map of the lower Ordovician materials cropping out in the Santa Maria la Real de Nieva Massif. The Ordovician sequence, Fm. Capas de Domingo García, comprises two separate stratigraphic units. The lower unit contains conglomerate with clasts of felsic volcanic rocks at its base, slates, and quartzite with cruziana. The upper unit is composed by the quartzite and slate, which is considered a regional equivalent of the sequence at the base of the Armorican Quartzite. The structure of the area is the result of the interference of the Variscan D3 folding with the D1 and D2 structures. Despite the interference, evidence is preserved that indicates an anomalous westward vergence of the Variscan D1 structure, analogous to local D1 structures in parts of the Portuguese sector of the Central Iberian Zone