1. Department of Geosciences, Environment and Land Planning, Faculty of Sciences, University of Porto, Rua Campo Alegre, Porto, Portugal
2. ICT (Institute of Earth Sciences) – Porto pole (Portugal)
3. Departamento de Mineralogía y Petrología, Univ. País Vasco (UPV/EHU), Apdo. 644, 48080-Bilbao, Spain