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From: Lang Farmer <farmer@xxxxxxxxxxxxxxxxxxxxx>
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Dear Colleagues,
We would like to call your attention to the below session sponsored by
the Volcanology, Geochemistry, and Petrology Section of the American
Geophysical Union during the AGU Joint Assembly to be held in Acapulco,
Mexico in May 22-25, 2007. We hope that those of you with an interest
in the origin of Phanerozoic igneous activity in SW North America will
consider submitting an abstract and attending the meeting. The abstract
deadline is March 1st and submission instructions can be found at
http://www.agu.org/meetings/ja07/?content=program.
Hope to see you in Acapulco.
Lang Farmer and Martin Valencia.
V07:
Space-Time-Composition Trends in Phanerozoic Magmatism, Southwestern
North America
Convener:
Lang Farmer
University of Colorado
Campus Box 399
Boulder, CO, USA 80309
farmer@xxxxxxxxxxxx
Martin Valencia Moreno
Estación Regional del Noroeste, Instituto de Geología, UNAM
Apartado Postal 1039
Hermosillo, SON, MEX C.P. 83240
valencia@xxxxxxxxxxxxxxxxxxxxxxxx
Description:
This session will involve reassessments of space-time-compositions
patterns in Phanerozoic magmatism in the southwestern United States and
Mexico, and of the implications these patterns have for understanding
the physical evolution of the continental lithosphere and underlying
mantle in this region. Particularly encouraged are submissions that use
large, regional data sets to look at such problems as the origin and
evolution of the Cordilleran magmatism and associated ore deposits,
particularly during the Laramide event, the spectacular mid-Tertiary
ignimbrite flare-up that built the Sierra Madre Occidental volcanic
province, the origin of both the northern and southern Basin and Range
extensional provinces, and the emplacement of the Mexican volcanic belt.
We consider that contributions to this session will largely enhance our
perception on the tectonic processes occurred in southwestern North
America since the initiation of plate convergence in the Pacific Ocean
margin in mid-Triassic time, particularly due to subduction of the large
Farallon and Kula plates, to the fragmentation and final consumption of
most of their volume beneath the North America continental crust. This
is a great opportunity to re-evaluate the various aspects of one of the
most notable and best preserved examples of an oceanic to continental
migratory arc on earth. Constructive discussions may help to clarify
and/or elucidate new ideas regarding our knowledge about the role of the
subducted slab geometry and both the lithospheric and asthenospheric
mantle. Computer-generated data animations providing a visual aspect of
the migration of magmatic activity and of the changes in magma
composition through the Phanerozoic time are also encouraged.
----------------------------------------------------------
G. Lang Farmer
Dept. of Geological Sciences
Campus Box 399
University of Colorado, Boulder
Boulder, CO 80309
Phone- (303)492-6534
Fax- (303)492-2606
farmer@xxxxxxxxxxxxxxxxxxxxx
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