** Apologies for Multiple Postings **
Dear Colleagues,
We would like to draw your attention to the following VGP session at
the AGU-CGU Joint Assembly Meeting in Montreal, Canada, May 17-21,
2004.
V04 Influences on Continental Rheology in Zones of Plate Convergence
The continental crust is a heterogeneous mixture of materials with
varying tectonic and thermal histories. In zones of plate
convergence, the response of continental crust to imposed tectonic
and gravitational loads is strongly dependent upon its rheology. To
better understand the chemical and mechanical evolution of the
continental crust in these zones, we must understand the processes
that influence crustal rheology. Many recent studies have shown that
crustal rheology is strongly influenced by variations in the
following parameters: 1) crustal composition and architecture, 2)
thermal structure, 3) magmatic history and the presence of partial
melt or other fluids, 4) deformation history and strain rates. One
area that is yielding particularly interesting results are those
studies that address temporal variation in continental rheology and
its imprint within the geological record. In many zones of plate
convergence, rheological profiles of the deep crust are extremely
heterogeneous and can change on time scales that are much less than
those that characterize a typical orogenic cycle. For Spring AGU
2004, we propose a special session to Volcanology, Geochemistry and
Petrology with co-sponsorship by Tectonophysics that will bring
together a variety of studies that can address continental rheology,
particularly that of the mid to lower crust, from different
viewpoints, including geochemical, petrological, numerical and
structural approaches. We are particularly interested in studies that
address time-space variations in the rheology of the mid-lower crust
and its possible expression in the geological record. We anticipate
that the session will attract interest across the spectrum from
petrology to tectonics and from geochronology to geophysics, and that
it will include contributions from field-based research, experiments
and geodynamic modeling.
Conveners: Phaedra Upton, University of Maine, Department of Earth
Sciences Bryand Global Sciences Center, Orono, ME 04469 USA, Tel: 207
581 2221, Fax: 207 581 2202, email: [log in to unmask], and
Tracy Rushmer, University of Vermont, Department of Geology,
Burlington, VT 05405 USA, Tel: 802-656-8136, Fax: 802-656-0045,
email: [log in to unmask], and Keith Klepeis, University of
Vermont, Department of Geology, Burlington, VT 05405 USA, Tel:
802-656-0247, Fax: 802-656-0045, email: [log in to unmask]
The abstract deadline is February 19, 2004 for electronic online
submissions. Further information regarding the meeting as well the
listing of approved sessions can be found at
<http://www.agu.org/meetings/sm04/>http://www.agu.org/meetings/sm04/
We very much look forward to your contributions and hope to see you
in Montreal this spring!
--
---------------------------
Tracy Rushmer, Department of Geology
University of Vermont, Burlington, Vermont
05405
Phone (direct): (802) 656-8136
(secretary): (802) 656-3396
