Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Bulankul'

stripes

Occurrence number: 
136-13-022
Country: 
Russia
Region: 
Kuznetsk-Minusinsk
Location: 
Longitude: 90.58, Latitude: 53.42
Carbonatite: 
No

The Bulankul' occurrence, which has an area of about 3x0.5 km, lies at the contact of Lower Cambrian limestones with intrusions of gabbro-diorite and syenite of the same age. The alkaline complex was emplaced in the order essexite, nepheline-bearing diorite-syenite, nepheline and nepheline-bearing syenite followed by a vein series of tinguaite and pegmatitic foyaite. The major part of the massif is composed of essexite which has the composition plagioclase (An55-45) (47-65%), olivine (1-3%), augite (7-18%), barkevikite (6-16%), nepheline (3-12%), biotite (5-10%), alkali feldspar (3-7%), apatite and Fe-Ti oxide minerals. Nepheline syenite consists essentially of microcline perthite (35-70%) and nepheline; albite and oligoclase (1-20%), augite and aegirine-augite (0-6%), hastingsite and barkevikite (3-20%) and biotite (1-8%) are also present; accessories include titanite, apatite and Fe-Ti oxide minerals. The nepheline diorite-syenite contains 20-65% andesine (An26-37), nepheline, alkali feldspar (10-50%), augite, diopside (8-18%), barkevikite and arfvedsonite (14-22%), apatite, titanite and Fe-Ti oxides.

References: 

DOVGAL' V.N. and SHIROKIH, V.A. 1980. History of the development of the high alkaline magmatism of the Kuznetsk Alatau. Proceedings of the Institute of Geology and Geophysics, Nauka, Siberian Branch of the Academy of Sciences, Novosibirsk. 457. 216 pp.
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.
SHOKHINA, O.I. 1959. Specific features of geology of the Bulankul' alkaline massif (south of the Krasnoyarsk Region). Proceedings of Higher Educational Institutions. Geology and Exploration, Moscow, 3: 54-64.
SHOKHINA, O.I. 1961. Alkaline rocks of the Bulancul' massif (the Krasnoyarsk Region). Publishing House of the Siberian Branch of the USSR Academy of Sciences, Novosibirsk. 70 pp.

Map: 
Fig. 2_164. Balankul (after Shokhina, 1961, Fig. 1).
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