PETROPHYSICAL STUDIES IN THE LATE-VARISCAN SANTA EULÁLIA PLUTONIC COMPLEX (OSSA-MORENA ZONE)

Abstract

The Santa Eulália Plutonic Complex (SEPC) is a calc-alkaline granitic body, with an area of 400 km2 located in the north of the Ossa Morena Zone of the Variscan Iberian sector, near the limit with the Central Iberian Zone. The SEPC is considered late-Variscan because it cross-cuts the regional variscan structures. The host rocks are metamorphic formations from Upper Proterozoic to Lower Paleozoic. The SEPC has two main granitic facies with different compositions and textures. From the rim to the core, there is a medium-to coarse-grained pink granite (G0), which involves large elongated masses of mafic to intermediate rocks (M) and central grey monzonitic granite (G1) which presents dominant medium granular facies. In this study we present petrophysical studies comprising Anisotropy of Magnetic Susceptibility (AMS), Isothermal Remanent Magnetization (IRM) and thermomagnetic studies which enabled us to better understand the magnetic fabric and behavior of the granite and mafic rocks.