Structural data from N Pakistan show that early Tertiary, S-vergent structures within the upper part of the Indian Plate and the Himalayan suture zone were overprinted by regionally developed N-vergent extensional structures. Such extension has been suggested, but not previously described from the NW Himalaya. Cooling histories suggest extension was Miocene in age. Extension was most likely the result of isostatic rebound resultant from crustal, or lithospheric, thickening and/or delamination.

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