stripes
The principal massif has an oval shape and occupies an area of about 1 km2. It cuts marbles of Proterozoic age and consists mainly of nepheline syenites, of which those towards the centre are distinguished by their trachytic texture, containing nepheline (26-48%), anorthoclase (34-38%), aegirine-augite (6-13%) and hastingsite (4-7%), as well as apatite and Fe-Ti oxide minerals. The northwestern part of the massif is composed of theralite and nepheline-bearing gabbro (essexite), which occupy 23% and 2% of the area of the massif respectively. The theralite consists of andesine (56%), liebeneritized nepheline (25%), aegirine-augite and amphibole (15%). The essexite is characterized by a lower nepheline content. Dykes of tinguaite and teschenite are associated with the complex.
IVASHKINA, R.N. 1963. Nephelinitic rocks of the Kurgusul'-Listvenny Massif. In I.K. Bazenov and Yu.D. Skobelev (eds) The geology and petrography of nepheline rocks of Kuznetsk Alatau. 78-100. Gosgeoltekhizdat. Moscow.
OSOKIN, E.D., LAPIN, A.V., KAPUSTIN, Yu.L., POHVISNEVA, E.A. and ALTUHOV, E.N. 1974. Alkaline provinces of Asia. Siberian-Pacific group.In L.S. Borodin (ed) Principal provinces and formations of alkaline rocks. 91-166. Nauka, Moscow.
