1 University of Catania, Department of Biological, Geological and Environmental Sciences, Corso Italia 57, 95129 Catania, Italy.
2 University of Cagliari, Department of Chemical and Geological Sciences, Universitary Campus, 09042 Monserrato, CA, Italy.
3 Universitat de Barcelona, Departament de Mineralogia, Petrologia i Geologia Aplicada, Facultat de Ciències de la Terra, C/ Martí i Franquès s/n, 08028 Barcelona, Spain.
4 Shell Italia Exploration & Production, Rome, Italy.
5 University of Catania, Department of Medical and Surgical Sciences and Advanced Technologies "GF Ingrassia", Via S. Sofia, 87, 95123 Catania, Italy.
6 University of Catania, Department of Biological, Geological and Environmental Sciences, Corso Italia 57, 95129 Catania, Italy. Electronic address: paolo.mazzoleni@unict.it.