The tectonic history of the southwestern United States and Sonora, Mexico, during the past 100 m.y

Article Abstract:

The tectonic history of the area bounded by the Colorado Plateau, New Mexico, Chihuahua, and southern and Baja California is reconstructed for the last 100 million years. Activity in this region peaked in mid-Cretaceous, and remains current and independent of boundary transform faulting. Magmatic emplacement due to subduction resulted in a large isostatic welt that elevated and spread outward, accompanied by erosional and tectonic unloading. Subsidence of the central portion and elevation of the marginal mountain ranges were evident from the mid-Miocene up to the present.

United States, Faults (Geology), Sonora, Mexico

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Late Cenozoic structure and tectonics of the northern Mojave Desert

Article Abstract:

Geographic mapping and structural and paleomagnetic analysis of the Northeast Mojave Domain's Fort Irwin region were studied to address plate motion partitioning across and within the plate boundary zone and to determine the kinematics, geometry, faulting timing and the distribution and role of vertical-axis rotations. The fault slips determined from geologic data do not match the rotations inferred from paleomagnetic declination anomalies because of the fault blocks' nonrigidity and the domain deformation's three-dimensional nature.

Mojave Desert

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Large-magnitude Oligo-Miocene extension in southern Sonora: Implications for the tectonic evolution of northwest Mexico

Article Abstract:

New geologic and geochronologic data is presented from an area in southeastern Sonora that provides information on the extensional and magmatic evolution. The extension was linked to a renewed pulse of mafic magmatism followed by prolonged tectonic and magmatic quiescence. A speculative new model for the Cenozoic evolution is proposed, where extension occurred mainly in an intra-arc setting.

Mexico, Magmatism

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