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The petrology of the basic and intermediate rocks of upper Swat, Pakistan

Published online by Cambridge University Press:  01 May 2009

M. Qasim Jan  and
D. R. C. Kempe
M. Qasim Jan
Affiliation:
Department of Geology, University of Peshawar, Pakistan
D. R. C. Kempe
Affiliation:
Department of Mineralogy, British Museum (Natural History)London SW7 5BD
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Summary

A series of metamorphosed (amphibolite facies) basic and intermediate igneous rocks from upper Swat, Pakistan, is described, with seven chemical analyses. The rocks intrude ?Palaeozoic metasediments and are partially bordered by other, later, intrusive and volcanic rocks. The group, now represented by, from S–N, epidote amphibolites, amphibolites, noritic and hypersthene gabbros, and quartz diorites, is considered to be derived from a series of plagioclase hypersthenites, norites, hypersthene gabbros, and hypersthene diorites. Variation diagrams are used to show that the series forms a differentiated sequence; FMA and lime-alkali diagrams suggest that it is similar to the rocks of the Garabal Hill–Loch Fyne area of Scotland. Some of the mineralogy of the group is briefly discussed, with five chemical analyses. A K/Ar age determination gives 67 Ma; thus the rocks probably derive from an early Himalayan (Alpine) tholeiitic basalt magma.

Type
Articles
Information
Geological Magazine , Volume 110 , Issue 3 , May 1973 , pp. 285 - 300
Copyright
Copyright © Cambridge University Press 1973

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References

Ashraf, M. 1969. Magnetite-bearing amphibolites near Manri Banda, Swat. 11th Annual Conf., Sci. Sue. Pakistan (Multan), Geol. Abstracts, 22 (in Urdu).Google Scholar
Daly, R. A. 1933. Igneous rocks and the depths of the earth. McGraw-Hill, New York.Google Scholar
Davies, R. G. 1965. The nature of the Upper Swat Hornblendic Group of Martin et al. (1962). Geol. Bull. Punjab Univ. 5, 51–2.Google Scholar
Deer, W. A. 1950. The diorites and associated rocks of the Glen Tilt complex, Perthshire. II. Diorites and appinites. Geol. Mag. 87, 181–95.CrossRefGoogle Scholar
Gorai, M. 1951. Petrological studies on plagioclase twins. Am. Miner. 36, 884–901.Google Scholar
Hallimond, A. F. 1943. On the graphical representation of the calciferous amphiboles. Am. Miner. 28, 65–89.Google Scholar
Jan, M. Qasim. 1970. Petrography of the upper part of Kohistan and southwestern Gilgit Agency along the Indus and Kandia Rivers. Geol. Bull. Univ. Peshawar 5, 27–48.Google Scholar
Jan, M. Qasim, Kempe, D. R. C. & Tahirkeli, R. A. K. 1969. The geology of the corundum-bearing and related rocks around Timurgara, Dir. Geol. Bull. Univ. Peshawar 4, 83–9.Google Scholar
Jan, M. Qasim, Kempe, D. R. C. & Tahirkeli, R. A. K. 1971. Corundum, altering to margarite, in amphibolites from Dir, West Pakistan. Mineralog. Mag. 38, 106–9.CrossRefGoogle Scholar
Jan, M. Qasim & Mian, I. 1971. Preliminary geology and petrography of Swat Kohistan. Geol. Bull. Univ. Peshawar 6, 1–32.Google Scholar
Jan, M. Qasim & Tahirkheli, R. A. K. 1969. The geology of the lower part of Indus Kohistan (Swat). Geol. Bull. Univ. Peshawar 4, 1–13.Google Scholar
Kakar, S. K., Mian, S. B. & Khan, J. 1971. The geology of the Jandul Valley, western Dir. Geol. Bull. Univ. Peshawar 6, 54–73.Google Scholar
Kostyuk, E. A. & Sobolev, V. S. 1969. Paragenetic types of calciferous amphiboles of metamorphic rocks. Lithos 2, 67–81.CrossRefGoogle Scholar
Leake, B. E. 1971. On aluminous and edenitic hornblendes. Mineral Mag. 38, 389–407.CrossRefGoogle Scholar
Martin, N. R., Siddiqui, S. F. A. & King, B. H. 1962. A geological reconnaissance of the region between the Lower Swat and Indus Rivers of Pakistan. Geol. Bull. Panjab Univ. 2, 1–14.Google Scholar
Nockolds, S. R. 1941. The Garabal Hill-Glen Fyne igneous complex. Q. Jl geol. Soc. Lond. 96, 451–511.CrossRefGoogle Scholar
Rehman, J. -ur & Zeb, A. 1970. The geology of the Shah Dheri-Kabal area, Swat. Geol. Bull. Univ. Peshawar, 5, 96–110.Google Scholar
Sultan, M. 1970. Volcanic rocks from Kalam, upper Swat. Geol. Bull. Univ. Peshawar 5, 138–41.Google Scholar