摘要: All along the Himalayan chain an axis of crystalline rocks has been preserved, made Higher Himalaya and nappes Lesser Himalaya. The salient points metamorphism, as deduced from data collected in central (central Nepal Kumaun), are: 1 The crystalline, also called Tibetan Slab, displays a polymetamorphic history with first stage Barrovian type overprinted by lower pressure and/or higher temperature metamorphism. metamorphism is due to quick quasi-adiabatic uplift Slab transport MCT ramp, accompanied thermal refraction effects contact zone between gneisses their sedimentary cover. resulting metamorphic pattern apparent (diachronic) inverse zonation, sillimanite above kyanite zone. 2 Conversely, famous inverted zonation basically primary pattern, acquired during one-stage prograde Its origin must be related thrusting MCT, heat supplied overlying hot shown synmetamorphic microstructures close geometrical relationships isograds thrust. 3 Thermal equilibrium reached units below MCT. Far behind thrust tip there good agreement maximum attained hanging wall second stage; but closer front, accordance both sides retrogressive episode basal part Slab.
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