Apologies for multiple postings and the late announcement.
Dear All,
We would like to invite you to contribute to session TS2.1 at EGU 2009 called
Porosity, permeability and fluid migration in ductile shear zones: integrating
views from metamorphic petrology, structural geology, mineralogy and
economic geology,
convened by Florian Fusseis ([log in to unmask]), Georg Dresen
([log in to unmask]) and Luca Menegon ([log in to unmask]).
EGU General Assembly 2009, April 19-24th,Vienna, Austria
Abstract deadline 13 January 2009.
http://meetings.copernicus.org/egu2009/
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We are looking forward to your great contributions and some hopefully lively
discussions in our session, which is motivated by the following ideas:
Conservative models for long-range fluid migration in the middle and lower
crust rely on an oversimplified view of fluid transport along grain boundaries
and through open fractures. However, the increasing knowledge about
metamorphic and deformational processes has emphasized the complicated
nature of porosity in rocks. It now seems questionable that the established
models grasp the complexity of the dynamic evolution of porosity around and
below the brittle-ductile transition.
Recent advances in experimental, microanalytical and modelling techniques
allow a reassessment of questions such as:
- Which processes generate pore space, permeable or not, in the middle and
lower crust and how does this porosity evolve in time?
- How can we quantitatively estimate porosity in crystalline rocks?
- What can we integrate a pressure-temperature-time-permeability evolution
with various tectonic settings?
- How do porosity evolution, fluid migration, metamorphism and rock
deformation feed back on each other over multiple scales?
- How do fluids evolve during their migration in a physical and P/T space and
how do these evolutions affect patterns of fluid/rock interaction we observe in
nature?
- What are the open questions? Which answers shall we seek in
interdisciplinary studies of which kind?
So long the different perspectives on fluid/rock interaction in the various
scientific disciplines have hampered a re-evaluation of fluid migration
processes. This session provides an interdisciplinary platform for structural
geologists, petrologists, mineralogists, geochemists, and economic geologists
to discuss processes influencing the porosity architecture in the middle and
lower crust. We aim at establishing an integrated view of fluid/rock
interaction and the associated metamorphic, geochemical and deformational
feedbacks.
If you have any questions, please do not hesitate to contact either of us!
See you in Vienna!
Florian Fusseis, Georg Dresen and Luca Menegon
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