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- W1514018963 abstract "Kinematic hypotheses for 2D, cross-sectional Laramide deformation in the Rocky Mountains include (1) block-tilting models and (2) basement thrust models with (a) subcrustal shear during low-angle subduction, (b) lithospheric buckling, (c) thickened lower crust under Laramide arches, and (d) crustal buckling during detachment of the upper crust. Vertical tectonic models invoking vertical or normal faults are falsified by major Laramide thrust faults and pervasive minor faults indicating NE-SW to E-W horizontal shortening. Seismic tomography documenting 200-km-thick Rocky Mountain lithosphere contradicts models predicting wholesale removal of North American mantle lithosphere by subcrustal shear during low-angle subduction. Preliminary gravity and deep seismic interpretations indicate a lack of correspondence between the Moho and Laramide arch geometries. This apparent lack of major Laramide faulting and folding of the Moho under the Rockies contradicts block-tilting models invoking reverse faults cutting the Moho and lithospheric buckling models. In addition, the maximum distances between Laramide arch culminations are generally smaller than buckle wavelengths expected for cratonic continental lithosphere. Geophysical evidence for rootless Laramide arches is incompatible with models predicting pure shear thickening of the lower crust under individual arches but is consistent with models invoking distributed lower crustal thickening over the entire Rockies. Rocky Mountain crustal geometries are most consistent with initial crustal buckling followed by upper crustal detachment on subhorizontal thrust faults that root to the west. An originally thick Rocky Mountain crust may have facilitated delamination and detachment folding of the upper crust during both the Laramide and the Ancestral Rocky Mountain orogenies." @default.
- W1514018963 created "2016-06-24" @default.
- W1514018963 creator A5071229159 @default.
- W1514018963 date "2005-01-01" @default.
- W1514018963 modified "2023-10-17" @default.
- W1514018963 title "2D Laramide geometries and kinematics of the Rocky Mountains, western U.S.A." @default.
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- W1514018963 doi "https://doi.org/10.1029/154gm02" @default.
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