Alkaline Rocks and Carbonatites of the World

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Talyshskii

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Occurrence number: 
136-04-002
Country: 
Armenia
Location: 
Longitude: 48.37, Latitude: 38.75

The Talyshskii folded zone is situated in the southeastern part of Azerbai'an and during the Eocene an extensive area of alkaline basaltic volcanic rocks were erupted. A series of leucite-sanidine tuffs and leucite tephrites and basanites, having a thickness of about 500 m, were ejected, during early, mid and late Eocene times, in the southern part of the Talyshskii zone; they extend into Iran. The leucite tuffs occur in the volcanic domes of Shandan-Kalasy and Green Hill. Mineralogically the tuffs consist of sanidine, plagioclase, leucite, augite, aegirine-augite, hornblende and volcanic glass. The leucite tephrites and basanites are found in the volcanoes of Geldar, Govery, Kiz-Kalashym Pashgra and Rasgov. They contain phenocrysts of plagioclase, leucite, olivine and augite set in a groundmass of glass, feldspar, augite, leucite and magnetite. The leucite tephrites also form dykes and sills including the Dimansky sill. The largest centre is the Kalakhanskaya subvolcanic intrusion, which forms a cone with a height of 1732 m; it is oval in plan. The rocks developed within Kalakhanskaya are trachyandesites, gabbro-teschenites, picrobasalts and leucite-bearing basalts. The gabbro-teschenites are composed of plagioclase (35-40%), augite (15-20%), biotite (3-5%), amphibole (1-6%), analcime (10-12%) and natrolite (2%) with accessory apatite, titanite and titanomagnetite.

References: 
AZIZBEKOV, S.A., BAGIROV, A.E., VELIEV, M.M., ISMAIL-ZADE, A.D., NIZHSERADZE, N.S., EMELYANOVA, E.N. and MAMEDOV, M.N. 1979. Geology and volcanism of Talish. Akademii Nauk Azerbaidzhanskoi SSR, Baku. 246 pp.
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