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Rongbuk Valley
Relationship between leucogranites and the Qomolangma detachment in the Rongbuk Valley, south Tibet
The Rongbuk leucogranite along the Rongbuk Valley with the Qomolangma peak ...
The Chaya detachment fault in Rongbuk Valley with giant leucogranite sills....
(Top) The author in Rongbuk Valley in 1998 with Mt. Everest in the backgro...
Generalized cross section through the Everest massif and the Rongbuk Valley...
Simplified geological map of Mount Everest region and Rongbuk Valley (after...
The making of Mt Everest: channel flow and low-angle normal faults in the compressional Himalayan orogen
Abstract: The Greater Himalayan Slab (GHS) is composed of a north-dipping anatectic core, bounded above by the South Tibetan detachment system (STDS) and below by the Main Central thrust zone (MCTZ). Assuming simultaneous movement on the MCTZ and STDS, the GHS can be modelled as a southward-extruding wedge or channel. New insights into extrusion-related flow within the GHS emerge from detailed kinematic and vorticity analyses in the Everest region. At the highest structural levels, mean kinematic vorticity number ( Wm ) estimates of 0.74–0.91 (c. 45–28% pure shear) were obtained from sheared Tethyan limestone and marble from the Yellow Band on Mount Everest. Underlying amphibolite-facies schists and gneisses, exposed in Rongbuk valley, yield Wm estimates of 0.57–0.85 (c. 62–35% pure shear) and associated microstructures indicate that flow occurred at close to peak metamorphic conditions. Vorticity analysis becomes progressively more problematic as deformation temperatures increase towards the anatectic core. Within the MCTZ, rigid elongate garnet grains yield Wm estimates of 0.63–0.77 ( c . 58–44% pure shear). We attribute flow partitioning in the GHS to spatial and temporal variations that resulted in the juxtaposition of amphibolite-facies rocks, which record early stages of extrusion, with greenschist to unmetamorphosed samples that record later stages of exhumation.