Petrography and Geochemistry of the Inclusions from the Ambela Granitic Complex, N. Pakistan
Abstract
Petrography of twelve and geochemistry of three selected samples are presented for the inclusions of the Ambela granitic complex. The inclusions are silicic to intermediate in composition with a metaluminous chemical character. Major element geochemistry is inconclusive with regards to their origin, but incompatible trace elements are in correspondence with the concentration of these elements in the host granites and syenites. A closer match, however, is with the acidic volcanics which now make a part of the country rocks but were probably the early phase of the Ambela granitic complex.
References
Butt, K.A., Chaudhry, M.N. & Ashraf, M. 1980. An interpretation of petrotectonic assemblage of western Himalayan syntaxis in Dir district and adjoining areas in northern Pakistan. Geol. Bull. Univ. Peshawar 13, 79-86.
Chaudhry. M.N., Ashraf, M. & Hussain, S.S., 198 1. Petrology of the Koga nepheline syenityes and pegmatities of Swat district. Geol. Bull. Punjab Univ. 16, 1-14.
Debon. P. & Le Fort, P., 1983. A chemical mineralogical classification of common plutonic rocks and associations. Trans. R. Soc. Edinb., Earth Sci. 73, 135-149.
De La Roche, H., Leterrier. J., Grandelande. P. & Marchal, I.M., 1980. A classification of volcanic and plutonic rocks using R1 R2 diagram and major element analyses. Its relation with current nomenclature. Chem. Geol 29, 183-210.
Kempe, D.R.C., 1973. Petrology of the Warsak alkaline granites of Pakistan and their relationship to the other alkaline rocks of the region. Geol. Mag. 110, 385-404.
Kempe, D.R.C., 1983. Alkaline granites, syenites, and associated rocks of the Peshawar Plain alkaline igneous province, NW Pakistan. In: Granites of Karakoram, Himalayas, and Hindukush (F.A. Shams, ed.). Institute of Geol., Pubjab Univ., Lahore, 143-170.
Kempe, D.R.C., & Jan, M.Q., 1970. An Alkaline igneous province in the North-West Frontier Province, West Pakistan. Geol. Mag. 107, 395-398.
Kempe, D.R.C., & Jan, M.Q., 1980. The Peshawar Plain alkaline igneous province, N.W. Pakistan. Geol. Bull. Univ. Peshawar 13, 71-77.
Le Bas, M.J., Le Maitre, R.W., Streckeisen, A. & Zenetline, B., 1986. A chemical classification of volcanic rocks on total alkali-silica diagram. J. Petrol. 27, 745-750.
Le Bas, M.J., Mian, I. & Rex, D.C., 1987. Age and nature of carbonatite emplacement in Noah Pakistan. Geol. Rundschau 76, 317-323.
Moyes, A.B., 1986. The Jinks Island complex: magma mixing in a high level intrusion from Biscoe island – Antartic Peninsula British Antartic Surv. Bull. 70, 55-69.
Rafiq, M., 1987. Petrology and geochemistry of the Ambela granitic complex, N.W.F.P., Pakistan. Unpub. Ph. D. thesis, Univ. Peshawar.
Rafiq, M., in prep. Petrography and geochemistry of microporphyrites from the NE part of the Peshawar Plain, NW Pakistan.
Rafiq, M., Shah, M.T., Rehman, M. & Ihsan, M., 1984. Petrochemistry of the rocks from Babaji area, a part of the Ambela granitic complex. Geol. Bull. Univ. Peshawar 17, 31-42.
Rafiq, M., & Jan, M.Q., 1988. Petrography of the Ambela granitic complex, NW Pakistan. Geol. Bull. Univ. Peshawar. (This volume).
Rafiq, M., & Jan, M. Q., 1989. Geochemistry and petrogenesis of the Ambela Granitic complex, NW Pakistan. Geol. Bull. Univ. Peshawar 22, 159-179.
Siddiqui, S.F.A., 1965. Alkaline rocks of Swat, Chamla. Geol. Bull. Punjab Univ. 5, 52.
Siddiqui, S.F.A., Choudhry, M.N. & Shakoor, A., 1968. Geology and petrology of feldspathoidal syenites and associated rocks of the Koga area, Chamla Valley, Swat, West Pakistan. Geol. Bull. Punjab Univ. 7, 1-30.
Reid, J.B., Evan, D.C. & Fates, D.G., 1983. Magma mixing in granitic rocks of the central Sierra Navada, California Earth Planet Sci. Lett. 66, 243-261.
Shand, S.J., 1949. Eruptive Rocks. Wiley, New York
Vernon, R.H., 1983. Restite, xenoliths and microgranitoid enclaves in granites. J. Proc. R. Soc. NSW 116, 77-104.
Vernon, R.H., 1984. Microgranitoid enclaves in granites, globules of hybrid magma quenched in a plutonic environment. Nature (London) 309, 438-439.
Wiebe, RA., 1974. Coexisting intermediate and basic magmas, Ingorish, Cape Briton Island. J. Geol. 8, 74-87.
