Alkaline Rocks and Carbonatites of the World

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



Occurrence number: 
Longitude: 46.33, Latitude: 38.95

The rocks of the Bargushatskii occurrence are located in the Bargushatskii mountain range and consist of a single 250x150 m mass as well as small lens-shaped and vein-like bodies, which occur in limestones that have been altered to skarns in a contact zone with leucocratic aplitic granites. The alkaline rocks including the smaller bodies, of which there are about 10, varying from 10-50 cm to 3-4 m across, comprise alkaline syenites, sviatonossite (andradite garnet-bearing syenite) and feldspathoidal rocks. The rock-forming minerals are microcline, albite, sodic plagioclase, quartz and aegirine. The accessory minerals include apatite, xenotime, magnetite, titanite, rutile, fluorite and anatase.

A K-Ar whole rock determination gave 35 Ma (Bagdasaryan, 1966).
BAGDASARYAN, G.P. 1966. Intrusive rocks of the Basumo-Pambaksky region. In Geology of the Armenian SSR. Petrography. Intrusive rocks. 3: 256-308. Armenian Academy of Sciences, Erevan. GUYUMDZHAN, O.P. 1963. Paragenesis of alkaline metasomatites of the Bargushat ridge. Izvestiya Akademii Nauk Armyanskoi SSR, Seriya Nauk o Zemla, Erevan. 3: 31-9. PERCHUK, L.L. 1963. Magmatic interchange of carbonate layers with the formation of nepheline syenites and other alkaline rocks: an example from the Dezhnev massif. Physico-chemical problems of the formation of igneous rocks and ores 2: 160-181. Akademii Nauk SSSR, Moscow. TATEVOSYAN, T.Sh. 1962. Conditions of formation of alkaline rocks of the Bargushatsk ridge (Armenian SSR), Ivestiya Akademii Nauk Armyanskoi SSR, Seriya Geologo-geograficheskikh. Erevan, 5: 15-26.
Fig. 2_53. Bargushatskii (after Tatevosyan, 1966, Fig. 67).
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