1. Western Australian Argon Isotope Facility JdL Centre & School of Earth and Planetary Sciences Curtin University GPO Box U1987 Perth Western Australia 6845 Australia
2. Laboratoire des Sciences du Climat et de L'Environnement UMR 8212 LSCE/IPSL CEA‐CNRS‐UVSQ Université Paris‐Saclay Gif‐Sur‐Yvette France
3. Dept of Mines, Industry Regulation and Safety Geological Survey of Western Australia East Perth Western Australia 6004 Australia
4. Department of Chemical Engineering Curtin University Perth Western Australia 6845 Australia
5. Berkeley Geochronology Center 2455 Ridge Rd. Berkeley California 94709 USA