Геохимия, возраст и геодинамические обстановки формирования саурской габбро-гранитоидной интрузивной серии (Восточный Казахстан)

Translated title of the contribution: Geochemistry, age and geodynamic settings for Saur gabbro-granite intrusive series (Eastern Kazakhstan)

Research output: Contribution to journalArticlepeer-review

Abstract

The territory of East Kazakhstan is part of the Altai collision system formed in the Late Paleozoic during the collision of the Siberian and Kazakhstan continents and the closure of the Ob-Zaisan paleooceanic basin. In the Early Carboniferous, in the Zharma-Saur zone, the Ob-Zaisan basin interacted with the active margin of the Kazakhstan continent. The formation of volcanic and intrusive associations was the result of these processes. The article presents the results of geochemical and geochronological studies of gabbro, granite and mafic dikes of the Zharma-Saur zone, Eastern Kazakhstan. It was established that gabbro-diorite-granite Saur intrusive series was formed 330-327 Ma in the geodynamic environment of subduction under the newly formed continental margin of the Kazakhstan continent. Gabbro and diorites were formed during the evolution of basic magmas resulting from the partial melting of the water-saturated depleted mantle over the subduction zone. Granite magmas were formed during the partial melting of volcanogenic-sedimentary substrates under the influence of basic magmas. For the first time, the age and geochemical features of dikes of the north-east strike in the Zharma-Saur zone are determined. They have a Middle Carboniferous age (315 Ma) and manifested as a result of break-offs in the lithosphere of the orogenic structure during shear movements along deep faults. Mafic dikes are characterized by a relatively enriched geochemical composition, which indicates another mantle source
Translated title of the contributionGeochemistry, age and geodynamic settings for Saur gabbro-granite intrusive series (Eastern Kazakhstan)
Original languageRussian
Pages (from-to)6-26
Number of pages21
JournalГеосферные исследования
Issue number2
DOIs
Publication statusPublished - Jun 2019

Keywords

  • gabbro-granite intrusive series
  • accretion-collision systems
  • Eastern Kazakhstan
  • Central Asia
  • CONTINENTAL-CRUST
  • MAGMATISM
  • TRANSBAIKALIA
  • TECTONICS

OECD FOS+WOS

  • 1.05 EARTH AND RELATED ENVIRONMENTAL SCIENCES

State classification of scientific and technological information

  • 38.33 Geochemistry
  • 38 GEOLOGY

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