Manrak
This intrusion consists of several varieties of peralkaline granite emplaced in Carboniferous sedimentary rocks.
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 intrusion consists of several varieties of peralkaline granite emplaced in Carboniferous sedimentary rocks.
This occurrence is represented by a dyke-like body and a rectangular intrusions of about 4.6x0.5 km. It cuts through terrigenous sediments with subordinate horizons of lavas and pyroclastics of basic compositon.
Extending over 22 km2 Kandygatai is composed of riebeckite granites, which sometimes contain astrophyllite. Accessories include zircon, columbite and apatite. There are dykes of peralkaline microgranite.
A granite intrusion of 9x3.5-4 km Akkoitas possibly is sill-like in form. Biotite granites are the most abundant rocks with less abundant areas of riebeckite and aegirine-riebeckite granites.
Intruded into Silurian sandstones this is a typical faulted intrusion extending for 8.5 km in a northwesterly direction but having a maximum width of only 750 m. There are peralkaline varieties of granite which have developed in the central part of the massif.
Koksalinskii is emplaced in Ordovician and Devonian extrusive formations. It has an elongate, dyke-like form and occupies an area of about 15 km2.
This granite intrusion is pear-shaped and covers 25 km2. It cuts through volcanogenic Devonian deposits and granodiorites.
This 15 km2 body is intruded into Cambrian and Ordovician sediments and tuffs. It comprises biotite, riebeckite-biotite, aegirine-biotite and muscovite-riebeckite syenites that grade gradually into each other. Pegmatites are also typical for the massif.
The 30 km2 Batpak intrusion is situated in the Chingis-Tarbagatai region and is composed of peralkaline quartz syenites.
This intrusion, of about 30 km2, is composed of riebeckite-aegirine syenites and granosyenites and is cut by small bodies of porphyritic leucogranite. The country rocks are late Palaeozoic granitoids which are cut by a northeasterly-trending system of basic and syenite dykes.