Pakistan Stratigraphy · stratigraphy.pk
Hispar Sar group
https://stratigraphy.pk/formation/hispar-sar-group
Hispar Sar group
Karakoram-Hindukush Basin · Southern Metamorphic Belt
A marble group of the Hispar–Hunza area that hosts the celebrated Hunza rubies.
Hispar Sar group is named after the right bank of Hispar glacier and may be traced northwestward into the Hunza valley. It consists of massive marbles with aluminous schists and quartzites with dark coloured amphibolite. It has tectonic contact with Hunza granodiorite and at places this contact is intrusive. This unit hosts the famous Hunza rubies and other gemstones (Kazmi and Jan 1997, Le Fort and Pechner 2001). Earlier this unit was named as Ganesh marble by Tahirkheli (1996).
Significance. A marble-dominated group of the Karakoram metamorphic belt with a tectonic, locally intrusive contact against the Hunza Granodiorite; earlier called the Ganesh Marble (Tahirkheli, 1996). Its ruby-corundum marbles, northeast of Aliabad, formed under high-grade conditions.
- Lithology
- Massive marble with aluminous schist, quartzite and dark amphibolite.
- Type locality
- Right bank of the Hispar glacier, extending northwest into the Hunza valley
- Basin
- Karakoram-Hindukush Basin
- Region
- Southern Metamorphic Belt
- Introduced by
- Tahirkheli (1996)
- Economic importance
- Hosts the famous Hunza ruby (corundum) deposits and other gemstones.
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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