The Tleumbetskii intrusion is situated in the region of Chingiz-Tarbogotay. It is a large complex with an area of 175 km2.
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Kazakhstan is a large country with an area of about 2.7 million km2. More than 50 occurrences of alkaline rocks are known which are spread widely over this extensive territory. It is probable that a number of distinct provinces are represented within the country but for the purpose of the present work all occurrences have been combined as one national group. The geology of Kazakhstan is complex and involves blocks of the East European (Russian) and Scyptian-Turanian platforms and Caledonian, Hercynian and Alpine fold belts. The distribution of the occurrences of alkaline igneous rocks are shown on Fig. 2_60.
This stock-like intrusion of 12 km2 is composed predominantly of medium-grained porphyritic peralkaline granites which cut porphyritic peralkaline syenites and quartz syenite porphyries. The associated dykes are of peralkaline granite porphyry.
Having a crescentic outline and an area of about 1 km2 the Polumesyats intrusion is composed of coarse- and medium-grained arfvedsonite-riebeckite granites with a subordinate role played by fine-grained riebeckite granite and peralkaline granosyenites.
Berkuty South is situated in the Chingiz-Tarbagotay and covers approximately 11 km2. It is a symmetrical body composed of coarse- and medium-grained porphyritic arfvedsonite and riebeckite granites.
The Akbiik intrusion cuts through Carboniferous volcanic rocks and small intrusive bodies of early upper Palaeozoic age. The massif is 18x4 km and composed of intrusions of biotite and riebeckite-biotite granites.
This is a dyke-like intrusion of riebeckite granite some 2 km in length lying along the northern margin of the Kandygataiskii granite massif. The Kyzyl-Char granite consists of 55-60% alkali feldspar, 25-30% quartz, 5-7% riebeckite and 2-3% biotite.
Kainarskii extends for 16 km north-south, has an average width of 7 km and an area of about 100 km2.
The Kshi-Orda complex cuts through syenites, diorites and monzonites of the Bakshory complex, which are probably Silurian in age. It occupies about 10 km2 and forms a partial ring structure which extends along a northwesterly line. The contacts dip at 60-70°.
This 10x4 km intrusion consists essentially of peralkaline granites. An extensive system of dykes is developed the first phase of which consists of aplites, granites, bostonites and spherulitic porphyries of both normal and peralkaline compositions.
Situated in the Keregetas Mountains the intrusion lies within extrusive deposits of Carboniferous age and upper Palaeozoic granitoids. It is somewhat elongate and dyke-like in form the length being 9 km but the width varying from only 100 to 850 m.