Source provenance

Siddiqui, F.A., Ashraf, M. & Qureshi, M.W. (1974). Geology of the serpentinite belt and associated rocks north of Hindubagh (Muslimbagh), Zhob Valley, Baluchistan, Pakistan. Geological Bulletin of the Punjab University, 10, 21-42.

Cited by 1 unit (1 published) · 0 field-level citations · 3 revision notes.

Full text reviewed (reviewer-supplied extract). ~120 sq mi map of the serpentinite belt N of Hindubagh (Muslimbagh), Zhob Valley. Serpentinized dunite (dominant) + layered harzburgite (bastite after bronzite) + relict peridotite, cut by pyroxenite dykes; dolerite blocks metasomatised to rodingite (grossular, idocrase/vesuvianite, prehnite). Emplaced tectonically along two sub-parallel E-W thrusts ~2.5 mi apart (Palaeocene-Eocene over Siwaliks); no contact metamorphism. Chromite mostly refractory grade (Tor Tangi) with metallurgical-grade in the east (Surghund, Gat). Birbirite silica residual cap (to 79.8% SiO2) mis-called 'laterite' by earlier workers. Nisai-Shaigalu contact found conformable, not thrust.

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Units citing this source

• Mesozoic Muslim Bagh Ophiolite Cretaceous
  • Lithology: Siddiqui, Ashraf & Qureshi (1974) mapped ~120 sq mi of the serpentinite belt north of Hindubagh (Muslimbagh), Zhob Valley: serpentinized dunite (dominant) with concordant layered harzburgite (bastite after bronzite) and minor relict peridotite, cut by pyroxenite dykes; dolerite blocks caught in the serpentinite are metasomatised to rodingite (grossular, idocrase/vesuvianite, prehnite, prochlorite).
  • Economic importance: Chromite in the belt is largely refractory grade (Cr2O3 ~50-55%, Cr/Fe 2.3-2.7 at Tor Tangi) with metallurgical-grade occurrences in the east (Surghund, Gat: Cr2O3 ~58%, Cr/Fe >3.4) (Siddiqui et al. 1974). Weathering of the serpentinite produced a silica-rich 'birbirite' residual cap (up to 79.8% SiO2), previously mis-identified as laterite.
  • stratigraphicPosition: The serpentinite was emplaced tectonically along two sub-parallel E-W thrusts ~2.5 mi apart, with Palaeocene-Eocene strata thrust over Siwalik/Oligo-Miocene clastics; no contact metamorphism accompanies the serpentinites, and the Nisai-Shaigalu contact was found to be conformable rather than a thrust (Siddiqui et al. 1974).