Alkaline Rocks and Carbonatites of the World

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

Strelka

stripes

Occurrence number: 
136-01-016
Country: 
Russia
Region: 
Aldan
Location: 
Longitude: 125.67, Latitude: 58.55
Carbonatite: 
No

Strelka is an intrusion of nepheline syenite of about 1 km diameter which cuts Archaean gneisses and Cambrian dolomites. The nepheline syenites have a trachytic texture and are formed of alkali feldspar (27-60%) and albite (17-36%) with some aegirine/aegirine-augite and nepheline and accessory magnetite, titanite, apatite, anatase, garnet and sulphides. The nepheline syenites are often albitized and in such rocks accessory eudialyte, apatite, zircon, ramsayite, baddeleyite, lamprophyllite, loparite, lomonosovite, Ca-rinkolite and labuntsovite are to be found.

References: 

KRAVCHENKO, S.M., KAPUSTIN, Yu.L., KATAEVA, Z.T. and BYKOVA, A.V. 1982. Agpaitic mineralization of the Mesozoic metasomatic rocks of potassic alkaline complexes of the Central Aldan. Doklady Akademii Nauk SSSR, 263: 435-9.
ORLOVA, M.P. 1990. Mesozoic stage of magmatism. In G.V. Polyakov and V.V. Kepezinskas (eds) Potassic alkaline magmatism of the Baikal-Stanovoy rift system. 65-123. Nauka, Siberian Division of the USSR Academy of Sciences, Novosibirsk.
OSOKIN, E.D., LAPIN, A.V., KAPUSTIN, Yu.L., POHVISNEVA, E.A. and
ALTUHOV, E.N. 1974. Alkaline provinces of Asia. Siberia-Pacific group. In L.S. Borodin (ed) Principal provinces and formations of alkaline rocks. 91-166. Nauka, Moscow.

Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith