Jack Nicholas Williams¹, Ake Fagereng², Luke Wedmore³, Juliet Biggs⁴, Hassan S. Mdala⁵ and Felix Mphepo⁵, (1)Cardiff University, School of Earth and Ocean Sciences, Cardiff, CF24, United Kingdom, (2)Cardiff University, Earth and Ocean Sciences, Cardiff, CF24, United Kingdom, (3)University of Bristol, School of Earth Sciences, Bristol, United Kingdom, (4)University of Bristol, COMET, School of Earth Sciences, Bristol, United Kingdom, (5)Geological Survey of Malawi, Zomba, Malawi