Geology of Kyrgyzstan
Terr. Kyrgyzstan whoget in the composition of the Ural-Mongolian folded geosynclinal belt, the structure to which isolated the base of the ancient pre-Mesozoic and Mesozoic-Cenozoic cover. In pre-Mesozoic structure of the territory of Kyrgyzstan is divided into 4 major structural regions: North, Middle and South Tien Shan and the Northern Pamir. Each of these areas consists of ancient uplifts and depressions, stratigraphic zones and sub-zones, separated from each other long-lived deep faults in the earth’s crust.
Northern Tien-Shan. Combines the ranges of Saili – ski Ala too, Kungey Ala-too, Kyrgyz, Terskey-Alatau, Jumgalski, Suusamyr, partially Talas Ala-too and Sekelsky. In the history of this area is allocated 7 tectonic. cycles. The main and final cycle — the Caledonian occurring during the early Paleozoic. The Caledonian structure in the field are Munkasci, Issyk-Kul and Talas-Kuratowski ancient arrays and separating them Kemin, Teskey-Kyrgyzskaya and Kara-Balta folded zones and systems zones.
Munkasci array unites the territory. The TRANS-ili Ala-Too, Northern slope of the Eastern part of Kyrgyz Ala-too and the Foundation of the Chuya depression. The base of the massif is composed of Archean gneiss, migmatite, amphibolite, educated and scatalogical for major effusions, identificatio. schist and limestone. The rocks are strongly deformed and would cause Risovany up to remelting. Above them are conventionally relatively hollow upper Proterozoic metamorphosed volcanic. rocks of intermediate and basic composition and carbonates with layers of quartzite. Formation, composing the Caledonian structure, form relatively peaceful folds and Nemeth – martinovna submitted Cambrian clastic, siliceous, volcanic. and carbonate marine sediments, sredneuralskie rhythmically-bedded sand-shale thickness and volcanic. rocks of intermediate composition, werbeartikel conglomerates. Found the bodies of ultrabasites, gabbro intrusions and gra – metodov of Proterozoic and late Ordovician-Silurian.
Issyk-Kul massif forms the basis of the same basin and the surrounding slopes of the Kungey Ala-LLP and the Teskey Ala-too. The ancient basement of the massif consists of intensely deformed and metamorphosed rocks of Proterozoic and possibly Archean. The most ancient of them are in the axial part of the Kungey Ala-LLP and represented by migmatite and gneiss. On the Northern slope of the Terskey-Alatau face metamorphosed quartzite-carbonate formations of the lower Proterozoic. There are small bodies of carbonate rocks, shale rocks and massifs of granitoids of the upper Proterozoic. Caledonian tectonic. complex in the peripheral parts of the array formed srednikami – SKO-spineuniverse sand-shale strata, with higher angular unconformity overlain by lower-middle-Ordovician shales, carbonate rocks, sandstones and rarely conglomerates. Medium-oldest-known example of the deposits in the North of the massif are composed of volcanic. rocks of intermediate composition, and in the South — sandy-shale. The upper Ordovician is represented by conglomerates and sandstones. Within the array the largest known body of granite and granodiorites composition.