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Chagai District, Balochistan (Baluchistan), Pakistan

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Chagai-Raskoh Arc Cross Section

Chagai District, Balochistan, Pakistan
 


The largest district in Pakistan, bordering Afghanistan at north, Iran at west, Washuk District at south and Nushki District and the Ras Koh Mtns. at the east.

Chagai-Raskoh magmatic arc
The Chagai-Raskoh arc shows the Cretaceous to recent deposition. Sinjrani Volcanic group: It consists of agglomerate, volcanic conglomerate, tuff and lava with subordinate shale, sandstone and limestone. It includes Basaltic-andesitic lava flows and volcaniclastics, with minor shale, sandstone, siltstone, lenticular bodies of limestone and mudstone. It is Mid to Late Cretaceous (Aptian to Santonian). This group was invaded during Late Cretaceous to Pleistocene by Chagai intrusions, represented by several phases including granite, adamellite, granodiorite, tonalite, diorite and gabbro. Its thickness is 900-1200m. The upper contact with Humai formation is generally conformable and lower contact is not exposed. Kuchaki volcanic group (equivalent of Sinjrani volcanic group) is named for the village of Kuchaki (34 G/8) about 63 km southwest of Ahmad Wal (HSC, 1961). It consists of volcanic agglomerate, lava, tuff, with subordinate inpersistent limestone, tuffaceous shale and sandstone near the top of the assemblage. Bunap complex includes the obducted ophiolite mélange which includes gabbro, diorite and serpentinite. The basic type contains pyroxene and amphibole. Its age is Late Cretaceous. Chagai intrusions include quartz hornblende diorite, normal diorite and biotite granite. Micropegmatitic quartz diorite is reported from Koh Naro. It is large batholiths that are invaded by Sinjrani volcanic group. The age is Late Cretaceous and later (HSC, 1961).

M. Sadiq Malkani - Geological Survey of Pakistan

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References

Muhammad Sadiq Malkani (2011) Stratigraphy, Mineral Potential, Geological History and Paleobiogeography of Balochistan Province, Pakistan. Sindh Univ. Res. Jour. (Sci. Ser.) Vol.43 (2) 269-290 (2011)

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