We invite you to come to the GSA Annual Meeting in Denver, Colorado, 31
October–3 November, 2010. Please consider presenting your recent science
in the following session. Abstract deadline is August 10th (go to:
http://www.geosociety.org/meetings/2010/techprog.htm)
T59. High-Pressure and High-Temperature Metamorphism: P-T-t Paths and
Tectonics
GSA Mineralogy, Geochemistry, Petrology, and Volcanology Division;
Mineralogical Society of America; GSA Structural Geology and Tectonics
Division
Conveners: Michael Brown, Fraukje Brouwer and Nigel Kelly
Advances in reliability of pressure-temperature-time information
retrieved from orogens and in sophistication of numerical modeling
studies make this session timely for those who integrate multiple
techniques to understand orogenesis at extreme pressure or temperature.
Keynote speakers: Philippe Agard (PUMC, France), Ethan Baxter (Boston,
U.S.A.) and Dave Kelsey (Adelaide, Australia).
Further information about the GSA Annual Meeting at:
http://www.geosociety.org/meetings/2010/
The unabridged session description follows:
Since the millennium, there have been significant advances in our
ability to extract pressure, temperature and time information from
orogenic belts that culminate in high-pressure or high-temperature
metamorphism. These advances include: the ability to recognize, date
and understand the significance of inclusion suites in refractory
minerals in metamorphic rocks, particularly those in dateable minerals
such as zircon and monazite; improvements to robust thermobarometry;
and, the wide use of thermodynamic modeling to identify trajectories of
P–T evolution. By linking trustworthy age information with reliable P–T
information we are able to define well-constrained P–T–t paths, and to
quantify rates of burial and exhumation as well as rates of heating and
cooling. These data provide key information to discriminate among
various tectonic models for orogenesis, particularly in relation to the
mechanisms of exhumation of high-pressure metamorphic belts and the
mechanisms of heating of high-temperature metamorphic belts. Data-rich
studies are complemented by extensive petrological–thermomechanical
numerical modeling that has become an essential element in testing
hypotheses of orogenic evolution. In this session, we seek to explore
the range of techniques used to characterize the P–T–t evolution of
metamorphic belts, the data that may be retrieved using these methods
and the interpretations that contribute to our better understanding of
the process of orogenesis. The session will be attractive to those
involved in field-based studies as well as those involved in modeling,
and to those with a background in petrology and tectonics as well as
those with a background in geochemistry and geochronology. Of
particular interest would be contributions that integrate multiple
techniques to understand orogenic processes involving extreme pressure
or temperature.
__________________________________________________________
Michael Brown, Professor of Geology and Chair of Department
Department of Geology
Geology Building (#237)
University of Maryland
College Park
MD 20742-4211
USA
[log in to unmask]
http: www.geol.umd.edu
Exec. asst.: 301 405 4065; Dept. office: 301 405 4082; Direct line: 301
405 4080
Direct fax: 301 314 7970; Dept. fax: 301 314 9661
LABORATORY FOR CRUSTAL PETROLOGY (Information at:
http: www.geol.umd.edu/pages/faculty/BROWN/LCP/lcp.htm)
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