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Publication Detail
Geochronological constraints on the evolution of the Nanga Parbat syntaxis, Pakistan Himalaya
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Treloar PJ, Rex DC, Guise PG, Wheeler J, Hurford AJ, Carter A
  • Publication date:
    19/06/2000
  • Pagination:
    137, 162
  • Journal:
    Geological Society Special Publication
  • Volume:
    170
  • Status:
    Published
  • Print ISSN:
    0305-8719
Abstract
New amphibole, muscovite and biotite Ar-Ar and K-Ar data and zircon and apatite fission track data are presented from the western margin of the Nanga Parbat syntaxis as well as from the Indus and Astor valley sections which cross the syntaxis. Amphibole data date a regional cooling through 500°C at 25 ± 5 Ma and are inconsistent with earlier suggestions that the peak of regional metamorphism was Neogene in age, although there is no doubt that some rocks were still at upper amphibolite facies temperatures as recently as 5 Ma. The data can be used to constrain structural models for syntaxial uplift. After an initial phase of crustal-scale buckling, bodily uplift of the syntaxis was along subvertical shear zones developed along its margins, although with a significantly higher time-averaged strained rate for shears developed along the western margin than along the eastern margin. The latter may be antithetic to the former. These shears were operative from 10 to <1 Ma. In the southwestern part of the syntaxis, this subvertical uplift was superseded, since 6 Ma, by uplift along moderately SE-dipping NW-vergent shears on the hanging wall of which are located Neogene-aged migmatites.
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