Uplift of the West Kunlun Range, northern Tibetan Plateau, dominated by brittle thickening of the upper crust
MetadataShow full item record
High-resolution seismic reflection data from the West Kunlun Range front show that crustal structures beneath the northwestern margin of the Tibetan Plateau are dominated by nappes of upper crustal rocks. Geological cross-section balancing suggests an average of 24.6–54 km (38%–52%) of upper crustal shortening. This horizontal shortening by brittle folding and faulting in the upper crust correlates positively with crustal thickening, an increase in Moho depth by 5–7 km, and the topography. Our work suggests that upper crustal shortening is a chief factor for topographic uplift and crustal thickening at the northwestern margin of the Tibetan Plateau. Such a mechanism is different from that proposed for the plateau south of the Karakax strike-slip fault, where crustal flow may have played a prominent role in plateau uplift.
Showing items related by title, author, creator and subject.
Syn-volcanic cannibalisation of juvenile felsic crust: Superimposed giant 18O-depleted rhyolite systems in the hot and thinned crust of Mesoproterozoic central AustraliaSmithies, R.; Kirkland, Chris; Cliff, J.; Howard, H.; Quentin de Gromard, R. (2015)Eruptions of voluminous 18O-depleted rhyolite provide the best evidence that the extreme conditions required to produce and accumulate huge volumes of felsic magma can occur in the upper 10 km of the crust. Mesoproterozoic ...
Constraining the mid-crustal channel flow beneath the Tibetan Plateau: data from the Nielaxiongbo gneiss dome, SE TibetYan, Dan-Ping; Zhou, Mei-Fu; Robinson, Paul; Grujic, Djordje; Malpas, John; Kennedy, Allen; Reynolds, Peter (2012)Gneiss domes involving the South Tibetan Detachment System provide evidence for crustal extension simultaneous with shortening. The Nielaxiongbo gneiss dome is composed of a metamorphic complex of granitic gneiss, ...
Ivanic, T.; Nebel, O.; Jourdan, Fred; Faure, K.; Kirkland, Chris; Belousova, E. (2015)Archean mafic-ultramafic melts, crystallized as layered intrusions in the upper crust and extruded as komatiitic flows, are primary probes of upper mantle chemistry. However, the message from their primary chemical ...