Pyrochlore Group Minerals in Carbonatites from Loe-Shilman, Khyber Agency, N.W.F.P.
Abstract
Metamict, partially metamict and nun metamict species of pyrochlore group minerals have been identified from a sheet like carbonatite complex in Loe-Shilman, Khyber Agency. Microscopy, X-ray diffractometery and partial chemical analyses are reported which indicate a chemical and structural variability between various species of pyrochlore. A multiplicity of intrusive activity is considered to be responsible for the variations described.
References
Ashraf, M., & Chaudhry, M.N., 1977. A note on the discovery of carbonatite from Malakand District. Geol. Bull. Punjab Univ. 14, 91-94.
Butt, K.A., Chaudhry, MN., Ashraf, M., 1980. An interpretation of petrotectonic assemblage west of western Himalaya syntaxis in Dir district and adjoining areas in Northern Pakistan. Proc. Intern. commit. Geodynamics, Grp. 6, Mtg. Peshawar, Spec. Issue, Geul. Bull. Univ. Peshawar, Vol. 13.
Ginzburg, A.I. and Feldoman, L.G., 1977. Deposits of Tantalum and niobium in ore deposits of U.S.S.R., Smirnov, V.I, ed. (translated by D.A. Brown) Pitman Publ. Ltd.
Hogarth, D.D., 1961. A study of pyrochlore and betafite. Canadian Min., 6, 610-633.
Jan, M.Q., Majid, M., Mahboob. T. and Shah, S., 1979. The petrography and petrogenesis of Shilman Carbonatite complex, Khyber Agency. Study Group at MINEPP (21st to 23rd July 1979).
Kempe, D.R.C., Jan, M.Q., 1970. An alkaline igneous province in the N.W.F.P. West Pakistan. Geol. Mag. 107, 395-398.
Qureshi, A.A., Beg, M.I., Babsr, A.N., (980. The radioactive carbonatite of the Shilman. Presented at PAEGKK Seminar Oct. 1980.
Rahman, M.A., 1980. Betafite in carbonatite from Khyber Agency, N.W.F.P., Pakistan Jour. Sci. Res. 32(1-2), 5-8.
Siddiqui, S.F.A., Chaudhry, M.N., and Shakoor, A., 1968. Geology and petrology of feldspathoidal syenites a d the associated rocks of Koga area, Chamla Valley. Geol. Bull. Punjab Univ. 7, 1-30.
Syed, S.A., 1975. Mineralogy and petrology of Loe-Shilman Uranium ore body Khyber Agency, N.W.F.P. Report AEMC, Lahore.
Vlasov, K.A., 1966. Geochemistry and Mineralogy of Rare Elements and genetic types of their Deposits. Vol. II (translated by Z. Leman). Israel programme for scientific translations, Jerusalem, 499.
