Tertiary deformation and metamorphism SE of Tibet: the folded Tiger-leap decollement of NW Yunnan, China

Article Abstract:

The structural study of multiphase shortening within the Yulong Shan range, northwest Yunnan, China, and radiometric dating of greenschist metamorphism provide Cenozoic shortening history of the area around the eastern Himalayan syntaxis. East directed transport took place on a flat ductile decollement during Late Eocene, followed by large clockwise rotations oriented towards south. Yulong Shan decollement resulted from east-west collisional shortening of the sedimentary cover of the Yangzi platform, due to India's penetration into Asia.

Research, Observations, Geology, Stratigraphic, Stratigraphy, Plate tectonics, Folds (Geology), Eocene Epoch

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The origin and evolution of the southern snake range decollement, east central Nevada

Article Abstract:

The dominant structure of the southern Snake Range decollement (SSRD) in east central Nevada arose during Oligocene and Miocene extensional deformation, and the total extension accommodated by the SSRD was between 8 and 24 km. The SSRD formed as a plastic shear zone, and differential isostatic unloading induces the SSRD to rotate to steeper dips, thereby it becomes a brittle normal fault until it finally rotates to its present shallow inclination.

Analysis, Snake Range, Nevada

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Northeastward growth of the Tibet plateau deduced from balanced reconstruction of two depositional areas: the Qaidam and Hexi Corridor basins, China

Article Abstract:

The interaction of tectonics and erosion in the desert-like regions north of the Kunlun in China are analyzed as a step toward understanding the manner by which the unusual existing morphology of north central Tibet came about. The study in particular focused on two areas, namely, the Qaidam and Hexi Corridor basins. It also uses isopach maps and drill logs to reconstruct their accumulated volumes and masses. Results of the study are discussed.

China, Case studies, Basins (Geology), Geomorphological research

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