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Ediacaran intracontinental channel flow

Tom Raimondo^1,*, Alan S. Collins¹, Martin Hand¹, Althea Walker-Hallam^1,, R. Hugh Smithies², Paul M. Evins² and Heather M. Howard²

¹ Continental Evolution Research Group, School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA 5005, Australia
² Geological Survey of Western Australia, Mineral House, 100 Plain Street, East Perth, WA 6004, Australia

Correspondence: *E-mail: thomas.raimondo{at}adelaide.edu.au.

Migmatitic lower-crustal rocks in the Ediacaran intracontinental Petermann orogen, central Australia, are bounded by regional-scale, low-angle shear fabrics that record opposing shear senses. New sensitive high-resolution ion microprobe (SHRIMP) titanite geochronology suggests that the contrasting shear systems developed synchronously. We argue that the macro scopic structural and metamorphic architecture satisfies the diagnostic criteria outlined by recently proposed channel flow models, and thus the remarkably well-preserved Petermann orogen is potentially an example of ancient intracontinental channel flow.