HR: 16:30h
AN: T34C-03 INVITED    [Abstracts]
TI: Unchannelized collapse of thickened continental crust and metamorphic core complex formation
AU: * Bendick, R
EM: bendick@mso.umt.edu
AF: Department of Geosciences University of Montana, 32 Campus Dr. #1296, Missoula, MT 59812-1296, United States
AU: Baldwin, J
EM: jbaldwin@mso.umt.edu
AF: Department of Geosciences University of Montana, 32 Campus Dr. #1296, Missoula, MT 59812-1296, United States
AB: Features common to a subset of metamorphic core complex footwall rocks globally include ductile fabrics, migmatitic rocks, mid-crustal maximum pressures, spatial and temporal association with orogenic crustal thickening, spatial association with lateral variations in crustal strength, and association with brittle normal faults. Continuous deformation of fluids under boundary conditions that allow finite vertical and horizontal velocities while maintaining continuity of vertical stresses through the lithosphere provide one candidate mechanism for formation of these complexes. Such systems simultaneously produce mid-crustal rock uplift by gravitational collapse and large extensional stresses at the base of an upper-crustal elastic lid. We explore the application of unchannelized flow models to case studies in the northern Rockies of the U.S. and the eastern Pamir.
DE: 8020 Mechanics, theory, and modeling
DE: 8031 Rheology: crust and lithosphere (8159)
DE: 8102 Continental contractional orogenic belts and inversion tectonics
DE: 8122 Dynamics: gravity and tectonics
SC: Tectonophysics [T]
MN: 2007 Fall Meeting