vol. 41 no. 6 675-678
- Received 25 October 2012.
- Revision received 14 January 2013.
- Accepted 17 January 2013.
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© 2013 Geological Society of America
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- 1Department of Earth Science and Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
- 2Institute of Geological Sciences, Planetary Sciences and Remote Sensing, Freie Universitaet Berlin, Malteserstrasse 74-100, D-12249 Berlin, Germany
- ↵*Current address: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, California 91109, USA; E-mail: .