Erosional processes as a control on the structural evolution of an actively deforming fold and thrust belt: an example from the Pamir-Tien Shan region, central Asia

Article Abstract:

A fold and thrust belt in the Pamir-Tien Shan region in central Asia was examined to demonstrate that three-dimensional process affect the erosion of orogens and the development of structures within the fold-thrust belt. Observations made on the surface geology and geomorphology of the study area was integrated into seismicity data observations to explain the kinematics of the active tectonic system. Based on the geologic history of the region, the orogens were suggested to have evolved from the trapping of a Late Miocene river between thrust systems of the Pamir and a basement uplift of the Tien Shan.

Analysis, History, Asia, Thrust faults (Geology), Thrust faults, Central Asia, Erosion, Erosion (Geology), Folds (Geology), Tien Shan

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Three-dimensional model of the late Cenozoic history of the Death Valley region, southeastern California

Article Abstract:

Paleogeographic reconstructions facilitate three-dimensional modeling of the kinematics of late Cenozoic deformation in the Death Valley region, southeastern California. The model suggests that deformation started at 6 Ma as a localized pull-apart system between two conjugate strike-slip faults. This was followed by a phase of distributed dextral transtension associated with the eastern California shear zone. Rotations and translations dominated the displacement field and the actual crustal thinning was small. The model is able to explain the complex evolution of the Black Mountains.

Models, Geology, Stratigraphic, Stratigraphy, Cenozoic Era, Paleogeography, Death Valley

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Modeling of Neogene crustal block rotation: case study of southeastern California

Article Abstract:

A two-dimensional numerical model simulates the mechanism of crustal block rotation in an active zone of the Pacific-North America transform plate boundary. The model explains strike-slip processes with block rotation. In the Eastern Transverse Ranges, realistic deformation occurs for a major horizontal stress component orientation of about 20 degrees east of north, with a maximum deviation of 15 degrees. The model fails to account for the deformation in the western part of the Mojave Desert, southeastern California, because it overlooks the slip on reverse faults.

Usage, Mojave Desert, Geological modeling, Geological models

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