1. Australian School of Petroleum, University of Adelaide, Adelaide, SA 5005, Australia.
2. Corresponding author.
3. Helmholtz Centre Potsdam, German Research Centre for Geosciences GFZ, Telegrafenberg, 14473 Potsdam, Germany.
4. School of Earth Sciences, University of Melbourne, Melbourne, Vic. 3010, Australia.
5. GNS Science – Te Pu Ao, Lower Hutt 5011, New Zealand.
6. Department of State Development (DSD), South Australia, Adelaide, SA 5001, Australia.