T13A:
Crustal Evolution in Large Hot Orogens From Pre-collisional Continental Margin Through the Collision and Collapse Stages: Evidence From Field, Analytical, and Numerical Studies III

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Session ID#: 6841

Session Description:
Large hot orogens (LHOs) are major sites of heat loss and recycling of continental crust. The tectonic evolution of LHOs has traditionally been considered in terms of processes during the formation of double thickness crust under an orogenic plateau, but recent work suggests it is also influenced by the pre-collisional history of the margins. In addition,  gravitationally driven collapse and associated magmatism and fluid influx may exert important controls on the final crustal architecture. With respect to thermal structure, the origin and duration of the peak granulite-facies temperatures in the middle and lower crust of LHOs and their link to syn-orogenic magmatism remain incompletely understood.

 This special session will feature contributions on recent modelling and field-based studies of the Grenville Province, an example of the exhumed roots of an LHO, but contributions from other LHOs such as the Variscan Belt and the Himalaya-Tibet Orogen are strongly encouraged.

Session Description - en français: Large hot orogens (LHOs) are major sites of heat loss and recycling of continental crust. The tectonic evolution of LHOs has traditionally been considered in terms of processes during the formation of double thickness crust under an orogenic plateau, but recent work suggests it is also influenced by the pre-collisional history of the margins. In addition,  gravitationally driven collapse and associated magmatism and fluid influx may exert important controls on the final crustal architecture. With respect to thermal structure, the origin and duration of the peak granulite-facies temperatures in the middle and lower crust of LHOs and their link to syn-orogenic magmatism remain incompletely understood.

 This special session will feature contributions on recent modelling and field-based studies of the Grenville Province, an example of the exhumed roots of an LHO, but contributions from other LHOs such as the Variscan Belt and the Himalaya-Tibet Orogen are strongly encouraged.

OSPA Liaison:  Toby Rivers, Memorial University of Newfoundland, Earth Sciences, St John's, NF, Canada
Chairs:  Fried Schwerdtner, University of Toronto, Earth Sciences, Toronto, ON, Canada and David Corrigan, Geological Survey of Canada, Ottawa, ON, Canada
Primary Convener:  Aphrodite Daphnee Indares, Memorial University of Newfoundland, Earth Sciences, St John's, NL, Canada
Conveners:  Toby Rivers, Memorial University of Newfoundland, Earth Sciences, St John's, NF, Canada and Fried Schwerdtner, University of Toronto, Earth Sciences, Toronto, ON, Canada
Index Terms:

0545 Modeling [COMPUTATIONAL GEOPHYSICS]
3660 Metamorphic petrology [MINERALOGY AND PETROLOGY]
8108 Continental tectonics: compressional [TECTONOPHYSICS]
8178 Tectonics and magmatism [TECTONOPHYSICS]
Co-Sponsor(s):
  • SE - Solid Earth
  • VGP - Volcanology, Geochemistry, and Petrology

Abstracts Submitted to this Session:

T13A-01
Muskoka Domain as a First-Order Detachment Zone during Exhumation and Orogenic Collapse: Support for a Core Complex Model for the Central Gneiss Belt, Western Grenville Province (33352)
Toby Rivers, Memorial University of Newfoundland, Earth Sciences, St John's, NF, Canada and Walfried Martin Schwerdtner, University of Toronto, Earth Sciences, Toronto, ON, Canada
T13A-02
Paleomagnetism: a Potential Avenue for Mapping the Allochthon Boundary Thrust and for Understanding the Development of the Grenville Orogen. (34403)
Henry C Halls and Alan Lovette, University of Toronto, Toronto, ON, Canada
T13A-03
Exhumation and cooling histories for high-pressure blocks above the western-most ABT: Potential insights from garnet zoning and rutile U-Pb depth profiling (35971)
Jeff Marsh, Queens College, Earth and Environmental Sciences, Flushing, NY, United States and Andrew Smye, Pennsylvania State University Main Campus, University Park, United States
T13A-04
3D Visualization of the Large-Scale Crustal Structure in the SW Grenville Province (35056)
Jacob Walter, Douglas Strong and Alan P Dickin, McMaster University, School of Geography and Earth Sciences, Hamilton, ON, Canada
T13A-05
Chronology of the Torngat orogeny: duration and extent of crustal melting from combined U-Pb zircon and monazite geochronology and Lu-Hf and Sm-Nd garnet geochronology (35753)
Benoit Charette1, Carl Guilmette1,2 and Daniel Bandyayera3, (1)University of Waterloo, Waterloo, ON, Canada, (2)Université Laval, Département de géologie et génie géologique, Québec City, QC, Canada, (3)Ministere de l'Energie et des Ressources Naturelles du Québec, Géologie Québec, Québec, QC, Canada
T13A-06
Is the Trans-Hudson Orogen a Large, Hot Orogen? Insights From Orogenesis and Cooling on Hall Peninsula, Baffin Island (35694)
Diane Skipton1, David A Schneider2, Marc Robert St-Onge1 and Dawn Kellett1, (1)Geological Survey of Canada, Natural Resources Canada, Ottawa, ON, Canada, (2)University of Ottawa, Department of Earth and Environmental Science, Ottawa, ON, Canada
T13A-07
The Paleoproterozoic Trans-Hudson Orogen: Large, Hot, but Only Moderately Thick? (Invited) (36577)
David Corrigan, Geological Survey of Canada, Ottawa, ON, Canada
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