Наукова періодика України Naukovyi visnyk Natsionalnoho Hirnychoho Universytetu


Yermolov P. V. 
Age and geodynamics of the Irtysh shear zone / P. V. Yermolov, Ye. V. Ponomareva, V. S. Portnov // Науковий вісник Національного гірничого університету. - 2018. - № 6. - С. 13-19. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2018_6_4
Purpose. To evaluate geodynamic processes of copper-ore deposits of the central and south-eastern regions of Kazakhstan which are spatially separated and different in genesis. Methodology. We use the new U-Pb (zircon), Re-Os (molybdenite) dating and older K-Ar (biotite) data obtained from the use of the conditional analysis by biotite (K2O >> 7 %) only. Findings. Based on the latest dating of rocks and ores of copper-porphyry deposits of Central Kazakhstan and Western Zhongar (China), a new model of the emergence and development of the copper-ore province is proposed. Originality. A model of the origin and development of the Central Kazakhstan copper-ore province, uniting the fields of different origin, age and ore potential in a single ore-magmatic system is developed. The model of porphyry copper deposit formation (accumulation-transportation - sag) perfectly explains the different genesis of the Central Kazakhstan coeval deposits. Practical value. Within the Central Kazakhstan copper-ore province is a priority object for a detailed study, based on the fact that according to statistics, about 85 % of copper-porphyry, and 100 % of copper-skarn ores occur either in magmatic rocks or in contact to them.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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Цитованість авторів публікації:
  • Yermolov P.
  • Ponomareva Y.
  • Portnov V.

  • Бібліографічний опис для цитування:

    Yermolov P. V. Age and geodynamics of the Irtysh shear zone / P. V. Yermolov, Ye. V. Ponomareva, V. S. Portnov // Науковий вісник Національного гірничого університету. - 2018. - № 6. - С. 13-19. - Режим доступу: http://nbuv.gov.ua/UJRN/Nvngu_2018_6_4.

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