This complex occurs within the Prisevanskaya zone, in the central part of the Bazumsky range of the Caucasus Mountains. The Garnasar outcrops of alkaline rocks cover an area of 12 km2 and represent a subvolcanic, laccolith-like body which is confined to a system of northeast-trending faults.
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The Caucasus is an Alpine orogenic structure generated by collision between the Eurasian and Afro-Arabian plates, the area of contact being marked by the Lesser Caucasus ophiolite zone and intense volcanic activity. The Alpine alkaline volcanism in the Caucasus occurs in two distinct structural settings the first of which is palaeoceanic and characterised by volcano-sedimentary sequences which are closely associated with the ophiolites. In the second setting the alkaline rocks are associated with an intra-arc extensional regime and were emplaced immediately after the main stage of continental collision. The alkaline magmatism is essentially Eocene to Miocene in age and is principally developed in the countries of Armenia, Azerbai'an and Georgia (Fig. 2_50). The greatest contributions to our knowledge of the Caucasian alkaline rocks were made by Adamyan (1955), Aslanyan (1958), Bagdasaryan (1966), Gevorkyan (1965), Kotlyar (1939), Meliksetyan (1963a and 1963b) and Azizbekov et al. (1979).
The Bunduk intrusion is situated several kilometres northeast of the Tezhsar complex on the southern slope of the Bazumsky mountain range. This is a dyke-like body expanding at its eastern end to a width of 2 km. There are also several smaller bodies in the vicinity with areas up to 1 km2.
Alkaline basalts, trachytes and phonolites with a thickness of 300-400 m are developed in the Palaeogene deposits of this region. Leucite tephrites and leucite phonolites are found in the succession.
The Tezhsar alkaline complex has an area of about 80 km2, is of central type and is developed in an elevated part of the Prisevanskaya zone of the Pambaksky range.
This complex is developed within the Vedi-Azat volcanic formation.
This volcanic complex lies in the southwestern part of central Armenia within the Western Aiotsdzor district and extends over an area of about 150 km2.
The Elpinskii complex is located within the Zavozhen-Akhavnadzorskaya tectonic depression in the south of Armenia. The earliest manifestations of igneous activity are represented by analcime basalts, the thickness of which is from 25 to 30 m.
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.
Shvanidzorskii is situated in the southeastern part of the Megrinskii granitoid pluton and is confined to a fracture zone striking northwest.