[1] Dipartimento Scienze, Universita Roma TRE, Roma, Italy
[2] The University of Texas at Austin, Jackson School of Geosciences, Austin,TX, United States
[3] Department of Earth Sciences, ETH Zürich (Swiss Federal Institute of Technology), Zurich, Switzerland
[4] Laboratoire de Geologie de Lyon, CNRS, Ecole Normale Superieure de Lyon, Lyon, France
[5] Earth Sciences Department, University of Cambridge, Cambridge, United Kingdom
[6] Massachusetts Institute of Technology, Earth, Atmospheric and Planetary Sciences, Cambridge,MA, United States
[7] Department of Earth Sciences, Institute for Rock Magnetism, University of Minnesota, Minneapolis,MN, United States
[8] Department of Geology and Geophysics, Yale University, New Haven,CT, United States
[9] Department of Earth, Planetary, and Space Sciences, University of California Los Angeles, Los Angeles,CA, United States
[10] Institute of Marine Sciences, University of California, Santa Cruz,CA, United States
[11] Institut für Geowissenschaften, Universität Potsdam, Potsdam-Golm, Germany
[12] W. M. Keck Science Department, Claremont McKenna College, Pitzer College, Scripps College, Claremont,CA, United States