stripes
This occurrence is 16 km2 in area and situated in the core of an anticline composed of schists, gneisses and marbles with the immediate country rocks massive biotite and amphibole granites. Of the three phases comprising the intrusion the first consists of alkaline syenites, which form the central part of the massif. These are hastingsite and biotite-hastingsite syenites the earliest of which are melanocratic rocks that are cut by mesocratic and leucocratic varieties. Pegmatites and quartz-albite and calcite veins are associated with the syenites which are widely albitized and zeolitized. The second phase, which intrudes the syenites, consists of foyaites with aegirine, sodalite and cancrinite. There is a pegmatitic facies and they are veined by albitites. The nepheline is partly altered to liebenerite and fluorite is widely developed. The third igneous phase is represented by dyke-shaped bodies of lepidomelane foyaite and biotite-hastingsite syenite, that are cut by dykes of medium-grained biotite-quartz syenite and alkaline granite.
BARATOV, R.B., AKRAMOV, A.N., MELNICHENKO, A.K. and DUSMATOV, V.D. 1978. New data on the absolute age of the Turpi massif of alkaline rocks. Izvestiya Akademii Nauk Tadzhikskoi SSSR. Otdelenie Geologo-khimicheskikh i Tekhnicheskikh nauk, 2: 63-71.
LYASHKEVICH, Z.M. 1959. Petrography of the alkaline massifs of the western part of the Alaisky ridge. PhD Thesis, University of Lvov. 301 pp.
LYASHKEVICH, Z.M. 1961. Peculiarities of the Turpi alkaline massif. Tadzhik Academy of Sciences, Geology-Chemistry Series, 2: 49-70.
