Please, consider submitting an abstract to the EGU General
assembly in Vienna, Austria (07-12 April 2013) for the session
entitled :
TS3.1/EMRP4.2 Fluid-rock interaction, deformation mechanisms and
microstructural development in shear zones
Conveners:
Luca Menegon (University of Tromsø, Department of Geology, Norway)
Michael Stipp (GEOMAR, Marine Geodynamics, Germany)
Giorgio Pennacchioni (University of Padova, Dipartimento di
Geoscienze, Italy)
Claudia Trepmann (Ludwig-Maximilians-Universität, Department of
Earth and Environmental Sciences, Germany)
Philippe Goncalves (Université de Franche-Comté, Laboratoire
Chrono-environnement, France)
Invited Speakers: Laurent Jolivet (Institut des Sciences de la Terre
d'Orléans, France) Martin Drury (Department of Earth Sciences, Utrecht
University, The Netherlands)
The investigation of the progressive microstructural development
and related deformation mechanisms in shear zones is important for
our understanding on strain localization, lithospheric strength,
and geodynamic processes in general. Microstructures and textures
(CPOs) represent the link between natural and experimental rock
deformation, allowing for an application and extrapolation of
laboratory data to natural shear zones and rock rheology. Changes
in mechanical behavior and rock strength are usually documented by
the deformation microstructure. These changes can be due to
transitions in deformation mechanisms, fluid-rock-interaction and
metamorphic reactions, and result either in deformation softening
or hardening potentially leading to strain localization vs.
de-localization. Metamorphic reactions allow for the determination
of P/T-conditions, an estimate on the presence or absence of water
and provide together with the microstructural information hints
about the relative timing of metamorphism and deformation.
Combining metamorphic petrology, thermodynamic modeling, and
microstructural geology is therefore essential for our
understanding of the formation and maintenance of shear zones in
the lithosphere.
This session welcomes all studies covering aspects of rock
deformation under metamorphic conditions in nature, experiment and
theory. It aims at spanning a bridge from micromechanics to
multi-scale field-based investigations and to lithosphere
rheology.
