Source provenance

Treloar, P.J., Petterson, M.G., Jan, M.Q. & Sullivan, M.A. (1996). A re-evaluation of the stratigraphy and evolution of the Kohistan arc sequence, Pakistan Himalaya: implications for magmatic and tectonic arc-building processes. Journal of the Geological Society, London, 153, 681-693.

Cited by 10 units (10 published) · 30 field-level citations · 6 revision notes.

Reviewer-supplied. Re-evaluation of the Kohistan island-arc stratigraphy; formally defines the Jaglot Group (metasediments + basaltic lavas on the Kamila Amphibolite Belt basement), overlain by the high-Mg boninitic Chalt Volcanic Group and intruded by the Kohistan Batholith.

This page is the reverse of each unit's per-field citations — it shows exactly what this reference supports, making the dataset's “no source, no fact” rule browsable both ways.

Units citing this source

• Mesozoic Chalt Volcanic Group Cretaceous
  AgeLithologyType localityIntroduced byDepositional environmentGeological significance
• Mesozoic Chilas Complex Cretaceous
  • Age: Treloar et al. (1996): the Chilas Complex — a massive calc-alkaline gabbronorite body up to ~50 km wide and ~300 km long (with high-Mg ultramafic–mafic cumulates) — was emplaced at c. 85 Ma (U–Pb zircon 84 ± 0.5 Ma, Zeitler et al. 1981) by intra-arc rifting. Its largely undeformed state, intruding the already-deformed Jaglot Group, indicates emplacement after the main late-Cretaceous suturing deformation; heat from its emplacement drove amphibolite-facies metamorphism, lower-arc melting and Stage-2 batholith plutonism.
• Mesozoic Gilgit Formation Cretaceous
  • Age: Treloar et al. (1996) treat the Gilgit paragneisses (Khan et al. 1993) as a constituent of the mid-Cretaceous Jaglot Group rather than a separately dated formation — noting a possible tension with the curated Jurassic age; no independent age is given for the paragneisses in this paper.
• Mesozoic Jaglot Group Jurassic–Cretaceous
  • Age: Treloar et al. (1996) formally define the Jaglot Group (also termed the Jaglot Schist Belt) as a major arc-stratigraphic unit north of the Chilas Complex, comprising greenschist-facies metabasalts (some pillowed) interbedded with quartz-rich volcaniclastic/schistose metasediments. Its age is uncertain but mid-Cretaceous — limestones in the Kalam area yield a mid-Jurassic to Cretaceous Rhabdophyllian fauna (Bender & Raza 1995) and it grades upward into the mid-Cretaceous Chalt volcanic rocks. Named constituents: the Peshmal Schists (basal), Jaglot volcanics, the Thelichi Formation and the Gilgit paragneisses.
  • Depositional environment: Treloar et al. (1996): the Jaglot Group was deposited by sediment-charged turbidity currents into a medium-to-deep-water intra-arc/back-arc extensional basin, with submarine basaltic eruptions, recording crustal stretching behind the active frontal arc. It was deposited onto the Kamila Amphibolite Belt basement (contact nowhere exposed, always separated by the Chilas gabbronorite), intruded on its south side by the Chilas Complex (which carries Jaglot xenoliths) and to the north by the Kohistan Batholith, and is overlain by the Chalt Volcanic Group; it most likely correlates with the Katzarah Formation east of the Nanga Parbat syntaxis.
• Mesozoic Kamila Amphibolite Belt Cretaceous
  AgeLithologyType localityIntroduced byDepositional environmentGeological significance
• Mesozoic Kohistan Batholith Cretaceous-Paleogene
  AgeLithologyType localityIntroduced byDepositional environmentGeological significance
• Mesozoic Peshmal Schists Cretaceous
  AgeLithologyType localityIntroduced byDepositional environmentGeological significance
• Cenozoic Shamran Volcanic Group Paleogene
  AgeLithologyType localityIntroduced byDepositional environmentGeological significance
• Mesozoic Thelichi Formation Cretaceous
  • Age: Treloar et al. (1996) treat the Thelichi Formation (the 'Thelichi Volcanic sequence' near Jaglot in the Indus Valley and W/SW of Gilgit; Khan 1994) as a volcanic constituent of the mid-Cretaceous Jaglot Group.
• Mesozoic Yasin Group Cretaceous
  • Age: Treloar et al. (1996): the turbiditic Yasin Group is Albian–Aptian (c. 114 Ma; faunal age, Pudsey 1986) and overlies the Chalt Volcanic Group, recording back-arc crustal stretching preceding suturing to Asia.