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Journal of the Geological Society; 2007; v. 164; issue.2; p. 353-358;
DOI: 10.1144/0016-76492006-039
© 2007 Geological Society of London

Original Article

Tectonic and climatic controls of alluvial-fan size and source-catchment relief

W.Brian Dade & Meagan E. Verdeyen

Department of Earth Sciences, HB 6105, Dartmouth College, Hanover, NH 03755, USA (e-mail: W.B.Dade@Dartmouth.edu)

The geometries of alluvial fans and their upland catchments subject to known rates of basin subsidence V and upland precipitation P, respectively, are compared with predictions from a quantitative analysis of an idealized landscape. We find that the dimensionless ratio V/P explains systematic trends in relative fan size and source catchment relief previously reported from environmentally wide-ranging regions worldwide, and contributes to the interpretation of recently reported observations of fan-like phenomena on Mars.