The Kohistan Basic Complex: A Summary based on Recent Petrological Research
Abstract
The central part of the Kohistan basic complex in the Swat district has been studied in detail petrographically and geochemically. The main rocks of the area -amphibolites, noritic rocks, and quartz diorites-do not appear to be directly related mutually or to the rocks of the Jijal complex (garnet granulites and alpine-type ultramafic rocks). Temperature and pressure estimates suggest that the various metamorphic rocks of the area were formed under different geothermal gradients. It is recommended that the notitic rocks be henceforth called pyroxene granulites.
References
Chaudhry, M.N. & Chaudhry, A.G., 1974. Geology of Khagram area, Dir district. Geol. Bull. Punjab Univ., 11, 21-44.
Gansser, A., 1974. The ophiolite melanage, a world-wide problem on Tethyan examples. Eclog. Geol. Helv., 97, 479-507.
Jan, M.Q., 1977. The mineralogy, geochemistry, and petrology of Swat Kohistan, NW Pakistan, Unpub. Ph.D. thesis, Univ. London.
Jan, M.Q., & Kempe, D.R.C., 1973. The petrology of the basic and intermediate rocks of Upper Swat, Pakistan. Geol. Mag., 110, 285-300.
Jan, M.Q., & Mian, I., 1971. Preliminary geology and petrography of Swat Kohistan. Geol. Bull. Univ. Peshawar, 6, 1-32.
Martin, N.R., Siddiqui, S.F.A. and King, B.H., 1962. A geological reconnaissance of the region between the Lower Swat and Indus Rivers of Pakistan. Geol. Bull. Panjab Univ., 2, 1-13.
O'hara, M.J., 1976. Thermal history of excavation of Archaean gneisses from the base of the continental crust. Crust Mantle Boundary Mtg., 24th Nov. 1976, Mineral. Soc. & Geol. Soc. London.
Shams, F.A., 1975. The petrology of the Thok valley igneous complex, Gilgit agency, northern Pakistan. Accad. Nat. Lincie, Ser. 8, 59, 453-64.
