Tectonic evolution of the central Annapurna Range, Nepalese Himalayas

Article Abstract:

Field and U-Pb geochronological surveys of the Modi Khola area, central Nepal reveal a close temporal/spatial link between contractional and extensional deformation on the bounding fault systems represented by the central Annapurna Range. A gravitational collapse appears to have resulted in alternations between shortening and extension over a few million years that represent the Early-Middle Miocene structural history of the Himalayan orogen. The survey shows a high strain zone concentrated along the Chromrong thrust with the most recent displacement occurring as early as Pliocene.

Observations, Geology, Stratigraphic, Stratigraphy, Miocene Epoch, Faults (Geology), Annapurna

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Age of metamorphism in the Lesser Himalaya and the Main Central Thrust zone, Garhwal India: results of illite crystallinity, 40Ar-39Ar fusion and K-Ar studies

Article Abstract:

Lesser Himalaya rocks, below Main Central Thrust (MCT) zone, have not experienced regional metamorphism during pre-collisional regional metamorphism. This result is obtained from studies of K-Ar whole rock cooling ages and illite crystallinity results. Pre-Cenozoic Ar-Ar and K-Ar ages are shown by low-grade metamorphic rocks below MCT. MCT thrusting, which probably started around 19.8 Ma in Garhwal, India, reset the ages of whole rock and mineral K-Ar and Ar-Ar.

Research, Metamorphism (Geology), Himalaya Mountains

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Synthrusting metamorphism, cooling, and erosion of the Himalayan Kathmandu Complex, Nepal

Article Abstract:

A new model indicating the evolution of one significant Main Central Thrust in the Kathmandu Complex is presented. This work rejects the suggestion that the Kathmandu Complex is a klippe or separate thrust sheet.

Kathmandu, Nepal

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