HR: 0800h
AN: T21B-0586    [Abstracts]
TI: Correlation of shear deformation and heat flow along the Coast and Insular belts of Western British Columbia, Canada
AU: * Erkan, K
EM: kerkan@smu.edu
AF: Departmnent of Geological Sciences,Southern Methodist University, PO Box 750395, Dallas, TX 75275, United States
AU: Blackwell, D
EM: blackwel@smu.edu
AF: Departmnent of Geological Sciences,Southern Methodist University, PO Box 750395, Dallas, TX 75275, United States
AB: Western margin of North American cordillera is characterized by a continuous band of low heat flow with varying magnitudes. These zones are associated with the outer arc regions of the present or recent subduction of Kula/Farallon/Juan de Fuca plates under North America. The subduction of Farallon/Kula plate ceased some 20 My ago north of Juan de Fuca plate and the cessation resulted in the formation of a transform boundary carried by the Quinn Charlotte and associated sub-parallel shear zones between Pacific and North American plates. The extinct outer arc covering the Coast and Insular belts of western British Columbia show thermal deficit constrained by surface heat flow measurements. A detailed study of heat flow variations and the locations of the shear failure zones show close correlations. Our study support that these remnant thermal deficit areas of extinct outer arc blocks in the western border of the Cordillera play an important role in the style of deformation of the transform boundary between Western North America and Pacific plates.
DE: 5104 Fracture and flow
DE: 7223 Earthquake interaction, forecasting, and prediction (1217, 1242)
DE: 8031 Rheology: crust and lithosphere (8159)
DE: 8034 Rheology and friction of fault zones (8163)
DE: 8111 Continental tectonics: strike-slip and transform
SC: Tectonophysics [T]
MN: 2007 Fall Meeting