Chen Xu^1,2, Jimin Yu^3,4, Megan Pelly¹, Claus-Dieter Hillenbrand⁵, Stephen Barker², Caroline H Lear⁶, Andrea Burke¹ and James William Buchanan Rae¹, (1)University of St Andrews, School of Earth and Environmental Sciences, St Andrews, United Kingdom, (2)Cardiff University, School of Earth and Environmental Sciences, Cardiff, United Kingdom, (3)Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, (4)Laoshan Laboratory, Qingdao, China, (5)British Antarctic Survey, Cambridge, United Kingdom, (6)Cardiff University, School of Earth and Ocean Sciences, Cardiff, United Kingdom