Department of Geological Sciences, University of Canterbury., Private Bag 4800, Christchurch, 8140 New Zealand ; National Institute of Water and Atmospheric Research., Private Bag 14901, Wellington, 6241 New Zealand
National Institute of Water and Atmospheric Research., Private Bag 14901, Wellington, 6241 New Zealand
Department of Geological Sciences, University of Canterbury., Private Bag 4800, Christchurch, 8140 New Zealand