Amber Madden-Nadeau¹, Mike Cassidy¹, David M Pyle¹, Tamsin A Mather¹, Sebastian Watt², Samantha L Engwell³, Mirzam Abdurrachman⁴ and Taufik Ismail⁵, (1)University of Oxford, Department of Earth Sciences, Oxford, United Kingdom, (2)University of Birmingham, School of Geography, Earth and Environmental Sciences, Birmingham, B15, United Kingdom, (3)British Geological Survey, The Lyell Centre, Edinburgh, United Kingdom, (4)Institut Teknologi Bandung, Bandung, Indonesia, (5)Indonesia College of Mineral and Technology, Department of Geology, Bandung, Indonesia