Alkaline Rocks and Carbonatites of the World

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Occurrence number: 
Longitude: 68.58, Latitude: 53.25

This is a faulted intrusion, lens-shaped in plan having a width of 100-800 m and an area of 2.5 km2. It is composed of banded clinopyroxenites rich in apatite and biotite and sometimes containing melanite and K-feldspar. A subordinate role is played by melanocratic and leucocratic mica shonkinites which sometimes contain pseudoleucite and altered olivine. The massif is cut by thin dykes of alkaline syenite and ledmorite, which are intensively granitised and altered to mica along the contacts. The intrusion has been intensively mylonitised and autometasomatically altered.

Based on geological data the intrusion is early Palaeozoic in age (Mikhailov and Orlova, 1971).
MIKHAILOV, N.P. and ORLOVA, M.P. 1971. Alkaline ultrabasic formation (Krasnomaysky intrusive complex). In N.P. Mikhailov (ed) Petrography of Central Kazakhstan 2: 298-313. Nedra, Moscow.
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith