Pakistan Stratigraphy · stratigraphy.pk
Chilas Complex
https://stratigraphy.pk/formation/chilas-complex
Stratigraphic position
Band colour = period; texture = dominant rock type. Lines between bands mark the contact type. True scale makes height ∝ recorded thickness; hatched = thickness not recorded. Ages approximate, for ordering.
This unit (highlighted) within its province column; faded ends continue above and below. Line style marks the contact type.
The Chilas Complex — a giant layered gabbro body that was the mid-crustal magma chamber of the Kohistan arc.
Largest mafic-ultramafic plutonic body in Kohistan arc. Represents deep-level arc crust. Contains platinum group elements.
Significance. The Chilas Complex — a huge mafic–ultramafic layered intrusion forming the mid-crustal level of the Kohistan arc, interpreted as a sub-arc magma-chamber complex; one of the world's classic exposures of arc mid-crust.
- Lithology
- Large mafic–ultramafic body — gabbronorite with serpentinized ultramafic rocks (dunite, harzburgite, pyroxenite), dolerite and gabbro; associated with the Babusar Pass mélange.
- Thickness
- 8-10 km thick
- Type locality
- Chilas, Gilgit-Baltistan
- Environment
- volcanic-arc, plutonic
- Introduced by
- Jan et al.
- Economic importance
- Platinum group element potential
Provinces
References
- Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.
- Kazmi, A.H. & Jan, M.Q. (1997). Geology and Tectonics of Pakistan. Graphic Publishers, Karachi.
Reviewer confidence: medium
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