Source provenance

Petterson, M.G. & Windley, B.F. (1985). Rb-Sr dating of the Kohistan arc-batholith in the Trans-Himalaya of north Pakistan, and tectonic implications. Earth and Planetary Science Letters, 74(1), 45-57.

Cited by 2 units (2 published) · 0 field-level citations · 1 revision note.

Rb-Sr whole-rock isochron dating of the Kohistan arc-batholith: first-stage Matum Das tonalite 102±12 Ma (pre-collision, intra-oceanic arc; initial 87Sr/86Sr 0.7039); second-stage Gilgit granitoids 54±4 Ma and 40±6 Ma (Andean-type, post-collision); post-collisional Indus Confluence aplite-pegmatite sheets 34±14 and 29±8 Ma. Major deformation between 102 and 54 Ma. Also notes the Chalt volcanics (basaltic tholeiites) and Dir-Utror Group (calc-alkaline lavas).

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Units citing this source

• Mesozoic Chalt Volcanic Group Cretaceous

  Listed as a corroborating source for this unit.

• Mesozoic Kohistan Batholith Cretaceous-Paleogene
  • Age: Petterson & Windley (1985): Rb-Sr whole-rock isochrons date the arc-batholith in three stages — the deformed first-stage Matum Das tonalite at 102±12 Ma (intra-oceanic, pre-collision; initial 87Sr/86Sr 0.7039) and second-stage Gilgit granitoids at 54±4 Ma and 40±6 Ma (Andean-type, post-collision), with post-collisional Indus Confluence aplite-pegmatite sheets at 34±14 and 29±8 Ma; major deformation fell between 102 and 54 Ma. This is the primary source for the three-stage age model, reviewed and extended by Petterson (2010, 2018).