Situated within the deep fracture zone which divides the north and central Tyan-Shan, the Chonashu intrusion extends over 10 km in a northeasterly direction but has a width of only 1-3 km.
You are here
Situated in the central Tyan-Shan Shamatorskii has an area of about 80 km2 and is a steeply dipping, lens-shaped body with a length 25 km and width up to 7 km.
Kaichinskii is situated on the northern slope of the Kok-Shaalsk Mountain ridge (Tyan-Shan) and a huge fracture zone. It cuts through upper Silurian schists, sandstones and limestones which form a large anticlinorium.
Ailagir lies within upper Silurian limestones and schists and upper Carboniferous biotite-amphibole granites and granosyenites. It is a northeasterly-trending elongate intrusion with steep to vertical contacts composed of coarse-grained porphyritic aegirine-augite syenites.
The Surtekin intrusion is situated on the southern slope of the Atbashi mountain ridge of the Tyan-Shan. It has an area of 20 km2 and lies within schists and limestones which are metamorphosed up to 400 m from the contact. The contacts dip steeply at 40-80° towards the centre.
Uzunbulak is a dyke-like intrusion of only 0.8 km2 situated on the southern slope of the Atbashi mountain ridge (Tyan-Shan) where it cuts through Silurian and Devonian schists and limestones.
Karaganskii is a 6 km2 intrusion composed of nepheline and alkaline syenites which are commonly altered with extensive replacement by sodalite, cancrinite and liebenerite.
Lying on the right bank of the central section of the Sokh River the Sokhskii intrusion is over 100 km2 in area. It forms an ethmolith (lopolith) with steep (70-80°) contacts which is located in the nucleus of an anticline of Silurian limestones which is overturned to the south.
Surmetashskii is a ring intrusion which is elliptical in plan. The country rocks are limestones, dolomites and schists. There are two principal intrusive phases: alkaline quartz-bearing syenites and tourmaline-bearing granites.
Situated on the left bank of the Isfairamsaya River 1 km below the confluence with the Vostochnii Kichikalay River, Chekindy is compositionally and structurally similar to the Sokhskii (No. 20) intrusion.