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The Tekturmas ophiolite belt of central Kazakhstan is located in the western Central Asian Orogenic Belt. It consists of three structural‐formational zones: Tekturmas (centre), Bazarbai (north), and Sarysui (south). The Tekturmas zone includes igneous and sedimentary rocks of Karamurun, Tekturmas, and Sarytau formations, which are dominated by volcanogenic, deep sea, and clastic deposits, respectively. The Bazarbai zone consists of Kuzek and Basarbai formations dominated, respectively, by basaltic and sedimentary rocks. The Sarysui zone includes terrigenous Airtau and olistostromic Ermek formations. The age of sedimentary rocks was constrained by microfossils. The igneous rocks of the Karamurun and Bazarbai formations are alkaline and subalkaline basalt/dolerite, andesibasalt, and andesite. There are three main groups of rocks: high‐Ti, mid‐Ti, and low‐Ti. The high‐Ti Karamurun volcanics and low‐Ti Bazarbai are variably enriched in light rare earth element (LREE) showing LREE enriched (high‐Ti) and LREE flat (low‐Ti) REE patterns. The high‐Ti group shows enrichment in Nb, Th, Zr, and Sm compared with the low‐Ti group. The low‐Ti group is special for the Nb troughs in primitive mantle‐normalized multi‐element diagrams, which are typical of supra‐subduction settings. Both groups yielded positive εNd values, although the averages are 4.6 and 7.5 for the high‐ and low‐Ti rocks, respectively. The geochemical features suggest formation of the igneous rocks in oceanic and supra‐subduction (intra‐oceanic arc) settings. The geological and geochemical features of the Tekturmas ophiolite belt accord well with the tectonic emplacement of ophiolites and formation of accretionary complex at a Pacific‐type convergent margin similar to those of the western Pacific.

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Purpose. Studying the age and structural relationships of the Irtysh shear zone with the Kalba-Narym zone, determining the age and geodynamic position of crystalline rocks at high temperatures and moderate pressures of the Irtysh shear zone. Methodology. Analysis of literature and stock materials; field research; sample preparation; carrying out isotope studies using SHRIMP-2 and LA-ICP-MS technology; determining small elements by the fusion method using ICP. findings. Detailed geological, petrographic and geochemical studies made it possible to identify three independent metamorphic complexes of the Irtysh shear zone, to determine their age and to establish the geodynamic position of the complexes of the Irtysh shear zone. Originality. The age of the main magmatic and metamorphic complexes developed in the central part of the Irtysh shear zone has been determined; SHRIMP-II, LA-ICP-MS technologies of foreign laboratories have been used; by the results of new dating the geodynamics of the Irtysh shear zone has been corrected. Practical value. From the standpoint of accretion tectonics, using up-to-date isotope dating methods, an attempt has been made to consider the geodynamics of crustal geoblocks ("terrains") and to find continuation of ore levels and ore belts of some terrains in the other ones.

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