Sevier- and Laramide-Style Tectonics in the Northern Rocky Mountains John S. Oldow Geological Sciences University of Idaho Moscow, Idaho.

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Presentation transcript:

Sevier- and Laramide-Style Tectonics in the Northern Rocky Mountains John S. Oldow Geological Sciences University of Idaho Moscow, Idaho

Tectonic Transition between northern and southern Cordillera McClelland and Oldow, 2005

Scientific Motivation 1. 3 dimensional architecture of contractional orogen 2. Degree of coupling between crust and mantle during plate boundary deformation 3. Plate margin modification during terrane accretion 4. Role of structural inheritance

Western margin of Mesozoic continental crust

Jurassic magmatic arc

Jurassic backarc deformation

Late Jurassic accretion of Wallowa terrane

Late Jurassic-Early Cretaceous backarc basin transpression

Late Jurassic and Cretaceous foreland thrusting

Research Opportunities 1.Transition from thin-skinned to thick-skinned foreland contraction 2. Displacement transfer from foreland contraction to hinterland crustal duplex 3.Plate boundary modification during terrane accretion 4.Role of structural inheritance in continental tectonics