Constraints of mantle and crustal sources and interaction during orogenesis: A zircon SHRIMP U-Th-Pb and O isotope study of the ‘calc-alkaline’ Brovales pluton, Ossa-Morena Zone, Iberian Variscan Belt

Magmas generated by melting of the continental crust and the mantle during collapse of collisional orogenic belts are compositionally heterogeneous and preserve evidence for mixing of the two magma sources. Deciphering the components of hybrid magmas is the key for assessing the relative contributions of mantle and crustal sources during orogenesis. Variscan plutons in the Ossa-Morena Zone are unusual, and particularly useful, because they...