Geochronology of the metamorphic rocks in the Kurai accretionary prism (south-eastern Gorny Altai)

A. V. Kulikova, M. M. Buslov, A. V. Travin

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The paper provides a review of the published and new geological and geochronological data on the metamorphic rocks in the Kurai accretionary prism, considering the evolution of the Kuznetsk-Altai island-arc paleosubduction channel of the Siberian continent. The following two stages are distinguished by 40Ar/39Ar and U/Pb dating: (1) 636-619 Ma and earlier: sinking of ophiolites into the subduction zone; (2) 604-585 Ma: sinking of the large bodies of oceanic uplifts into the subduction zone. These processes led to the exhumation of the high-pressure rocks and the hot Chagan-Uzun peridotites. The dynamo-thermal effect of the latter on the basalts is reflected in the inverted metamorphic zoning and the occurrence of garnet amphibolites and plagiogranite migmatites. It is probable that the paleo-seamounts collided with the island arc during the Vendian-Early Cambrian. The data reviewed in this paper give evidence of an active margin of the West Pacific type in the western Altai-Sayan folded region in the Vendian-Cambrian.

Original languageEnglish
Pages (from-to)1049-1063
Number of pages15
JournalGeodynamics and Tectonophysics
Volume8
Issue number4
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • Ar/Ar dating
  • Accretionary prism
  • Geochronology
  • Metamorphic rocks
  • geochronology
  • Ar-40/Ar-39 dating
  • COMPLEX
  • TECTONICS
  • CRUSTAL GROWTH
  • GEODYNAMICS
  • accretionary prism
  • metamorphic rocks
  • OPHIOLITE
  • EVOLUTION
  • CENTRAL-ASIA
  • BELT
  • SIBERIAN CONTINENT
  • RUSSIA

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