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leucite tephrites and minor amount of picritic lava
flows. Leucite tephrites and
leucitites occur in the central part of the section (450 m). The volcanic section at the
top is composed of agglomerates of leucite and biotite-bearing phonolites and tuffs
of latite and trachyandesites. Volcanic necks and dykes, comprising trachybasalts,
leucite tephrites and trachytes, shonkinite porphyry and biotite syenites are
observed within the extrusive rocks and in the vicinity of the complex. According to
Eremeev (1984), the extrusive rocks were erupted 322 Ma ago.
4.12.7 Kaindy (42
21
N, 70
35
E)
°
°
The Kaindy complex located at Talassky Alatau is a pipe-like stock comprising
psuedoleucite-bearing pyroxenite. There are also associated intrusive rocks of
monzonites, syenites (with or without pseudoleucite) and nepheline syenites
(Nurlibayev 1973).
4.12.8 Irisu (42
20
N, 70
27
E)
°
°
Stocks with ring dykes (Fig. 4.31 ) intrude limestone-bearing sedimentary formation
at Irisu (Kogarko et al. 1995). The complex extends over an area of (9
3km 2 ). The
rocks from youngest to oldest age in progression include, the following rock types:
(1) olivine leucitite and leucitite, (2) nepheline porphyry, shonkinite porphyry and
×
2 km
Quaternary deposits
Clinopyroxenite
Leucite basalt and leucitite
Diopside skam with magnetite
Alkaline syenite and monzonite
Pseudoleucite and nepheline syenite
Shonkinite
Marble
Nepheline syenite
Fault
Attitude of layering and bedding
Fig. 4.31 Sketch map of Irisu complex, Kazakhstan (after Nurlibayev 1973)
 
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