Erosion in southern Tibet shut down at ∼10 Ma due to enhanced rock uplift within the Himalaya

摘要: Exhumation of the southern Tibetan plateau margin reflects interplay between surface and lithospheric dynamics within Himalaya–Tibet orogen. We report thermochronometric data from a 1.2-km elevation transect granitoids eastern Lhasa terrane, Tibet, which indicate rapid exhumation exceeding 1 km/Ma 17–16 to 12–11 Ma followed by very slow present. hypothesize that these changes in occurred response loci rate rock uplift resulting southward shift main topographic drainage divides terrane their current positions Himalaya. At ∼17 Ma, steep erosive networks would have flowed across Himalaya greater amounts moisture advected into drive large-scale erosional exhumation. As convergence thickened widened Himalaya, orographic barrier precipitation Tibet strengthened. Previously documented midcrustal duplexing around 10 generated zone high use numerical simulations as conceptual tool highlight how could defeated transverse networks, substantial reorganization. When combined with strengthening precipitation, this reorganization driven sharp reduction we observe Tibet.