Pengxiang Hu¹, David Heslop¹, Raphael Armando Viscarra Rossel², Andrew P Roberts¹ and Xiang Zhao³, (1)The Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, (2)Curtin University, School of Molecular and Life Sciences, Perth, WA, Australia, (3)The Australian National University, Research School of Earth Sciences, Canberra, Australia