Adele J. Cameron (a), Philip F. Sexton (a), Pallavi Anand (a), Manuela A. Fehr (a,b) & Howie D. Scher (c)
(a) Department of Earth Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK. E-mail: adele.cameron@open.ac.uk
(b) Now at: Institute for Mineralogy and Petrology, Clausiusstrasse 25, ETH Zürich, CH-8092 Zürich, Switzerland.
(c) Department of Earth and Ocean Sciences, University of South Carolina, Columbia, SC 29208, USA.