1. Departamento
de Geologia and CeGUL, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
2. Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom
3. Geoscience Department and Geophysics Centre, University of Évora, Apt. 94, 7002-554 Évora, Portugal