Geology Reference
In-Depth Information
4.12.3 Pkhrutskii (38
51
N, 48
10
E)
°
′
°
′
The Pkhrutskii massif (37
40 Ma, Bagdasaryan 1966) is extended over an area of
10 km
2
. The entire body represents a single intrusive phase and is constituted of
nepheline-kalsilite monzonite, essexite and medium to
-
fine-grained syenite. In
addition to nepheline and kalsilite, orthoclase, andesine, augite, aegirine-augite and
biotite are other constituent minerals. While sodalite is an accessory phase, albiti-
zation associated with a metasomatic process is also encountered.
4.12.4 Talyshskii (38
°
45
′
N, 48
°
22
′
E)
The alkaline volcanic complex of Talyshskii was emplaced in a folded belt, located
in the southeastern part of Azerbai
an during Eocene (Azizbekov et al. 1979). The
complex is characterized by the presence of a series of leucite- and sanidine-bearing
tuffs, leucite tephrites and basanites having a total thickness of 500 m. These
volcanic series were erupted during early, middle and late Eocene in the southern
part of the Talyshskii zone and are extended up to Iran. According to Azizbekov
et al. (1979), leucite-bearing tuffs, comprising sanidine, plagioclase, leucite, augite
and hornblende set in a glassy groundmass, occur as volcanic domes at Shandan-
Kalasy and Green Hill. The leucite tephrites and basanites are products of volcanoes
at Geldar, Govery, Kiz-Kalashym Pashgra and Rasgov. These tephrites are char-
acterized by the presence of phenocrystal leucite, plagioclase, olivine and augite set
in a groundmass of the same phases but with additional magnetite. Leucite tephrite
also occurs as sills in Dimansky. The large intrusive complex at Kalakhanskaya
occurs as a cone with a height of 1732 m, comprising trachyandesite, gabbro,
teschenite, picrobasalt and leucite-bearing rocks.
'
4.12.5 Ishimskii Complex (51
°
17
′
N, 66
°
33
′
E)
The Ishimskii Massif (Mineyeva 1972) is located at the periphery of Cuba-Sadir
Mountain in central Kazakhstan. The complex is characterized by both intrusive
and extrusive rocks comprising leucite-bearing tepherites, augite porphyries,
pseudo-leucite porphyries. There are also two volcanic phases of pseudoleucite-
bearing trachytes and tinguaites.
4.12.6 Daubabinskoe (42
28
N, 70
07
E)
°
′
°
′
The complex is located in the southern part of Kazakhstan. According to Kogarko
et al. (1995) there are two volcanic sequences, one comprising leucite and analcite-
bearing trachybasalts and tuffs and the other with lava
flows, breccias and tuffs of
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