Dear Colleagues:
We are writing to call your attention to a Session
T - 36.03 " Fluid-rock interaction "
ILP, TASK GROUP III-8/IMA
as part of the Topical Symposium:
T - 36 " Ultra-High Pressure Metamorphism (UHPM): from the
Nano Scale to the Plate Tectonics Scale
of the 32nd International Geological Congress (IGC) to be held in
Florence August 20-28, 2004
http://wwww.32igc.org
IGC Session T36-03 : "Fluid-Rock
Interaction"
Convenors:
Maria-Luca Frezzotti (Università di Siena, [log in to unmask])
Pascal Philippot (Institut de Physique du Globe de Paris,
[log in to unmask])
Jacques Touret (Ecole de Mines de Paris,
[log in to unmask])
Fluids play major mechanical and chemical roles during high to ultrahigh
pressure metamorphism attending subduction and exhumation of crustal and
mantle rocks. Many existing models for fluid release, element recycling
and rock strength during subduction are based on dehydration/hydration
reactions implying, or assuming, H2O as
the main fluid component. However, there is growing evidence for
“supercriticality” under high pressure conditions, arguing for continuous
miscibility between H2O-rich fluids and
hydrous melt. Solubility of major framework hosting phases in felsic,
mafic and ultramafic rocks are basically unknown at high pressure
conditions, nor is the activity of H2O,
which is a critical parameter in all dehydration/hydration reactions.
This special session will investigate the roles of fluids during
subduction and exhumation processes of continental and oceanic crusts in
petrological, mineralogical, geochemical and mechanical evolution of the
Earth's crust and mantle. Contributions are thus encouraged involving
theoretical, experimental and/or analytical studies of various aspects
involving high to ultra high pressure fluids. These include: (1) fluid
flow, heat transport, and chemical metasomatism attending subduction and
exhumation; (2) solubility, element partitioning and transport properties
of high pressure fluids (3) flow regimes as inferred from isotope
systematics and fluid inclusion studies; (4) timing and duration of fluid
processes.
Invited Speakers :
Zachary Sharp (University of New Mexico)
The importance of chlorine in subducting serpentinites
Marco Scambelluri (Universita di Genoa)
Deep subduction of the oceanic mantle: implications for fluid
processes and trace element mobility
Proceedings :
As illustrated by recent symposium at the Goldschmidt conference in
Kurashiki, Japan and the EMU School in Budapest, there is significant
interest at present on fluid-rock processes in subduction zones and UHP
metamorphism. Chemical Geology has expressed interest in
publishing a special volume on this topic.
Thank you
Maria Luce Frezzotti, Pascal Philippot and Jacques Touret
Pascal Philippot
Laboratoire de Géosciences Marines
Institut de Physique du Globe de Paris
Case 89, 4 place Jussieu
75252 Paris Cedex 05
France
Tel : 33-(0)1 44 27 71 42
Fax : 33-(0)1 44 27 99 69
