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SUMMARY:The interplay between brittle and ductile processes at oceanic tra
 nsform faults - Jessica Warren\, University of Delaware
DTSTART:20151103T160000Z
DTEND:20151103T170000Z
UID:TALK61224@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:Long sections of plate boundaries move by displacement on faul
 ts\, which in the oceans includes transform faults and low angle detachmen
 t faults. Studies have long demonstrated that fluid circulation helps driv
 e weakening and seismic failure in the shallow brittle zone of faults. In 
 the oceanic lithosphere\, fluid circulation is usually assumed to end when
  rocks transition from brittle failure to plastic flow. I will present new
  results that suggest that water circulates into the brittle-ductile zone 
 on oceanic faults\, through an alternating cycle of brittle fracture and d
 uctile mylonitic deformation. Peridotite minerals react with water to form
  weaker hydrous phases\, suggesting that hydration may be essential for lo
 calized deformation across the entire oceanic plate boundary.\n\nReference
  list:\nBehn\, M. D.\, M. S. Boettcher\, and G. Hirth (2007)\, Thermal str
 ucture of oceanic transform faults\, Geol\, 35(4)\, 307–310\, doi:10.113
 0/G23112A.1.\n\nMcGuire\, J. J.\, J. A. Collins\, P. Gouédard\, E. Roland
 \, D. Lizarralde\, M. S. Boettcher\, M. D. Behn\, and R. D. van der Hilst 
 (2012)\, Variations in earthquake rupture properties along the Gofar trans
 form fault\, East Pacific Rise\, Nature Geoscience\, 5\, 336–341\, doi:1
 0.1038/ngeo1454.\n\nWarren\, J. M.\, and G. Hirth (2006)\, Grain size sens
 itive deformation mechanisms in naturally deformed peridotites\, Earth and
  Planetary Science Letters\, 248(1-2)\, 438–450\, doi:10.1016/j.epsl.200
 6.06.006.\n
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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