Formation and palaeozoic evolution of the gorny-altai-altai-mongolia suture zone (south siberia): Zircon u/pb constraints on the igneous record

S. Glorie, J. De Grave, M. M. Buslov, F. I. Zhimulev, A. Izmer, W. Vandoorne, A. Ryabinin, P. Van den haute, F. Vanhaecke, M. A. Elburg

Research output: Contribution to journalArticlepeer-review

152 Citations (Scopus)

Abstract

The Altai-Sayan Fold Belt epitomises how Phanerozoic island-arc continental crust contributed to the growth of the Palaeo-Eurasian continent. Its formation is dominated by the closure of the Palaeo-Asian Ocean (PAO) when island-arc systems and Gondwana-derived terranes accreted to the Siberian margin. Relics of the PAO related tectonic units and associated granitoids occur along the ophiolitic Charysh-Terekta-Ulagan-Sayan suture (CTUSs) between Gorny-Altai and Altai-Mongolia. Zircon LA-ICP-MS U/Pb dating of this igneous record constrains the multi-stage geodynamic PAO evolution. Primitive Kuznetsk-Altai island-arc crust formed at the Siberian margin during the Ediacaran-Early Cambrian (525-555. Ma). This island-arc matured during the Middle-Late Cambrian (~. 510. Ma) and was consumed by PAO subduction in the Late Cambrian-Early Ordovician (480-490. Ma) forming the Siberian Early Caledonian accretion-collision belt. South of the CTUSs, granitic magmatism occurred within Gondwana-derived Altai-Mongolia during the Middle-Late Ordovician (450-470. Ma) Palaeo-Kazakhstan assembly and during a Silurian-Early Devonian (400-425. Ma) Andean-type collision. Middle-Late Devonian (360-395. Ma) granitoids were emplaced as a result of the collision of Altai-Mongolia with Siberia. During final Pangaea amalgamation, the suture was strike-slip reactivated (associated magmatism ~. 295. Ma). The youngest (220-255. Ma) sampled granitoids originated in an intra-plate setting.

Original languageEnglish
Pages (from-to)465-484
Number of pages20
JournalGondwana Research
Volume20
Issue number2-3
DOIs
Publication statusPublished - Sept 2011
Externally publishedYes

Keywords

  • Central asian orogenic belt
  • Charysh-terekta-ulagan-sayan suture
  • Gorny altai
  • Phanerozoic continental growth
  • Zircon LA-ICP-MS U/Pb geochronology

ASJC Scopus subject areas

  • Geology

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