1. Istituto Nazionale di Geofisica e Vulcanologia, 00143 Roma, Italy
2. Istituto di Geologia Ambientale e Geoingegneria, CNR, Monterotondo, 00015 Rome, Italy
3. Barnard College, Columbia University, NY 10027, USA
4. Laboratoire des sciences du climat et de l'environnement, UMR8212, IPSL, CEA/CNRS/UVSQ et Université Paris –Saclay, Gif-Sur-Yvette 91191, France
5. Berkeley Geochronology Center, Berkeley, CA 94709, USA
6. Department of Earth and Planetary Science, University California, Berkeley, CA 94709, USA