Jaglot Group

Attested in Shah (2009), Geological Survey of Pakistan Memoir 22 - the Stratigraphic Committee of Pakistan's compiled lexicon (listed in the memoir's contents). Adds the definitional GSP/SCP lexicon citation.

Shah, S.M.I. (2009)

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.

Treloar, P.J., Petterson, M.G., Jan, M.Q. & Sullivan, M.A. (1996)

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.

Treloar, P.J., Petterson, M.G., Jan, M.Q. & Sullivan, M.A. (1996)

Khan T. et al. (1997) subdivide the Jaglot Group near Gilgit, from bottom to top, into the Gilgit Formation, the Gashu-Confluence Volcanics and the Thelichi Formation — reported there for the first time as a thick metasedimentary–metavolcanic arc succession.

Khan, T., Jan, M.Q., Khan, M.A. & Kausar, A.B. (1997)

Yamamoto et al. (2011): the Jaglot Group in the Thelichi section (Indus valley) is a north-dipping tectonic stack — structural bottom Thelichi Formation, middle Gashu-Confluence Volcanics, top Gilgit Formation — with consistent northward younging rather than the previously inferred 'Jaglot syncline'. The stack records northward subduction and closure of the Kohistan back-arc basin against the Asian margin (~100 Ma); the Chalt Volcanic Group conformably overlies the group.

Yamamoto, H., Rehman, H.U., Kaneko, Y. & Kausar, A.B. (2011)

Khan T. et al. (1994), mapping >4000 km² of Kohistan between Gilgit and Chilas, define the Jaglot Group as a succession of metasediments and metavolcanics divided (base to top) into the Gilgit Formation, Gashu-Confluence Volcanics and Thelichi Formation, regionally metamorphosed in greenschist-to-amphibolite facies (sillimanite in the Gilgit paragneisses). The predominance of turbidites and pillowed basalts indicates deposition in an oceanic, probably back-arc, basin, and the group is correlated with the Yasin Group sediments and Chalt Volcanics of the Northern Suture. In this mapping the stratigraphy is repeated by the crustal-scale Gilgit anticline and Jaglot syncline — a fold-repetition (the 'Jaglot syncline') later disputed by Yamamoto et al. (2011), who read the section as a north-dipping tectonic stack.

Khan, T., Khan, M.A. & Jan, M.Q. (1994)

Coward et al. (1984): the volcanics at Chalt and the sediments near Gilgit are folded around a major westward-facing Jaglot syncline - a second-phase structure with a half-wavelength well over 50 km that, with its parasitic folds, affects the rocks from Gilgit to Jijal and is one of the largest crustal-scale tight synclines known; metamorphic grade in the Kohistan sequence ranges from greenschist facies in the core of the Jaglot syncline to high-pressure granulite facies in the Jijal Complex against the MMT.

Coward, M.P., Jan, M.Q., Rex, D., Tarney, J., Thirlwall, M. & Windley, B.F. (1984)