EGU General Assembly 2007
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  Information - TS2.4 Absolute dating of the brittle deformation (co-listed in IG)

Event Information
Progress in the understanding of both rates and duration of tectonic processes are key to the physical modelling of earth processes. Of the various structural levels, deformation in the brittle area remains very difficult to date since resulting facies are rarely associated to significant crystallization of neoformed minerals. At best the geochronologists and structuralists are left with either very cold brecciation or gouge facies, or at the contrary flash melting facies such as pseudotachylites. Both facies are badly understood, thermodynamically out of equilibrium, and largely dominated by inherited geochemical, and mineralogical remnants. Paradoxically, along many major tectonic features, deformation in the brittle zone is often the only accessible exposure of deformation. It is the case for recent deformation phases for example, when deep ductile facies have not been exposed yet, typically along major continental shear zones. In general, available analytical tools in geochronology, well handled when concerning high temperature deformation phases, reveal themselves inadequate when it concerns to date “cold” tectonics.
This session aims at gathering a multidisciplinary set of presentations illustrating different problems and analytical solutions addressing the dating of brittle deformation processes. Contributions can concern direct dating of fault products as breccias, gouges or pseudotachylites, thermochronology linking deformation with cooling paths, time-duration of fault scarp exposures, etc.

Preliminary List of Solicited Speakers


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