Cambro–Ordovician silicic magmatism in the Central Iberian Zone of Massif (Ollo de Sapo Formation, OSF) constitutes a voluminous and geochemically atypical magmatic event that formed preceding breakup northern margin Gondwana. To date, due to uncommon geochemical signatures, such as high Fe, Mg content compared anatectic melts departing from calc-alkaline trends, origin is not fully understood....