[1] CSIC, IPNA, Estn Volcanolog Canarias, Tenerife, Spain
[2] CSIC, Inst Ciencias Tierra Jaume Almera, Barcelona, Spain
[3] CNRS, CEA, Lab Sci Climat & Environm, F-75700 Paris, France
[4] Univ Bremen, Fachbereich Geowissensch, D-2800 Bremen 33, Germany
[5] Future Ocean, IFM, GEOMAR, Kiel, Germany
[6] UBP, CNRS, MSH, Geolab UMR 6042, Clermont Ferrand, France
[7] Univ Las Palmas Gran Canaria, Dpto Fis Geol, Las Palmas Gran Canaria, Spain
[8] CSIC, Museo Nacl Ciencias Nat, Dpto Geol, E-28006 Madrid, Spain
[9] Uppsala Univ, CEMPEG, Dept Earth Sci, Uppsala, Sweden
[10] GFZ German Res Ctr Geosci, Potsdam, Germany