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Department of Earth Sciences, Keele University, Staffordshire ST5 5BG, UK Museo Tridentino di Scienze Naturali, Via Calepina 14, 38100 Trent, Italy Department of Earth Sciences, Open University, Milton Keynes, MK7 6AA, UK Department of Geology, University College, Belfield, Dublin 4, Ireland NERC Isotope Geology Laboratory, Keyworth, Nottingham NG12 5GG, UK
Department of Earth Sciences, Keele University, Staffordshire ST5 5BG, UK Museo Tridentino di Scienze Naturali, Via Calepina 14, 38100 Trent, Italy Department of Earth Sciences, Open University, Milton Keynes, MK7 6AA, UK Department of Geology, University College, Belfield, Dublin 4, Ireland NERC Isotope Geology Laboratory, Keyworth, Nottingham NG12 5GG, UK
Department of Earth Sciences, Keele University, Staffordshire ST5 5BG, UK Museo Tridentino di Scienze Naturali, Via Calepina 14, 38100 Trent, Italy Department of Earth Sciences, Open University, Milton Keynes, MK7 6AA, UK Department of Geology, University College, Belfield, Dublin 4, Ireland NERC Isotope Geology Laboratory, Keyworth, Nottingham NG12 5GG, UK