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we invite you to
submit an abstract to the following Session of the
GSA Cordilleran Section Annual Meeting 2013,
20-22 May 2013, Fresno, California (USA).
http://www.geosociety.org/Sections/cord/2013mtg/
Session T2 - Mélanges:
comparison and contrast between Circum Pacific and Tethyan
chaotic rock bodies and modern submarine analogues
Conveners: Yildirim Dilek, Andrea Festa, and
Yujiro Ogawa
http://www.geosociety.org/Sections/cord/2013mtg/techprog.htm
Deadline for abstract submissions is 19 February
2013
Summary of the session:
Our current knowledge of
mélanges and chaotic rock bodies has been derived to the
largest extent from the U.S. Cordillera concept of mélanges
and its comparison with the Circum-Pacific and Tethyan mélange
occurrences. However, there are some major differences, as
well as strong similarities, between the mélange-forming
processes that have been documented from the Cordilleran and
Tethyan orogenic systems. Mélange-forming processes in
Tethyan-type orogenic belts are commonly associated with
passive margin evolution, subduction, and obduction of oceanic
lithosphere, continental collision, and intra-continental
deformation. Mélanges in Cordilleran-type orogenic belts are
commonly involved, on the other hand, in the dynamics and
mechanical stability of accretionary wedges, and hence are
mostly the products of offscraping, underplating,
mass-transport movements (olistostromes), subduction channel
dynamics (flow mélanges), and mud diapirism. This session will
provide an international forum for the exchange of current
ideas and information about mélanges and chaotic rock bodies
from the Circum-Pacific and Tethyan case studies, across the
disciplinary boundaries (e.g., stratigraphy, structural
geology, tectonics, sedimentology, marine geology,
geochemistry, and thermochronology). Contributions covering a
large spectrum of geological and geodynamic environments both
on land and in modern submarine settings, in which mélanges,
other chaotic rock bodies, and mud diapirs/volcanoes develop
are welcome.
Relevant Field Trips:
F7: Mélanges, HP Metamorphism, Subduction
Accretion and Erosion, Subduction Megathrusts and Ophiolites:
The Franciscan and Related Rocks; F3:
From Deep to Modern Time along the Western Sierra Nevada
Foothills–San Joaquin to Kern Drainages.
Kind Regards,
The Session Conveners
Yildirim DILEK (Miami University, USA)
Andrea FESTA (University of Torino, Italy)
Yujiro OGAWA (Century Tsukuba-Miraidaira, Japan)
-- ___________________________________ Andrea Festa Dipartimento di Scienze della Terra Universitŕ degli Studi di Torino Via Valperga Caluso, 35 10125 - TORINO (Italy) Phone: - +39-011-670.51.86 Fax: -+39-011-670.53.39 e-mail: [log in to unmask] ___________________________________