Petrophysical and geochemical characterization of the late-variscan Santa Eulália Plutonic Complex (Ossa-Morena Zone, Portugal)

Abstract

The Santa Eulália Plutonic Complex (SEPC) is a calc-alkaline granitic body located in the northern part of the Ossa Morena Zone, composed by a medium- to coarse-grained pink granite (G0 group) involving large elongated masses of mafic (gabbroic) to intermediate (granodioritic) rocks, M group, and a central gray monzonitic granite (G1 group) which present dominant medium granular facies. A multidisciplinary study, including petrophysical, AMS and IRM measurements, and geochemical data, elemental and isotopic (Nd and 18O), point out differences in magnetic behaviour, magnetic lineations patterns and geochemical features, reflecting distinct petrogenetic processes at the level of the magmatic sources and evolution, as well as the emplacement mechanisms of M, G0 and G1 facies associated in the SEPC.