Geochemistry, zircon U-Pb age and Hf isotopes of the North Muya block granitoids (Central Asian Orogenic Belt)

constraints on petrogenesis and geodynamic significance of felsic magmatism

Sergei Yu Skuzovatov*, Kuo Lung Wang, Vladislav S. Shatsky, Mikhail M. Buslov

*Corresponding author for this work

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The Baikal-Muya Foldbelt is one of the oldest and the most enigmatic terrain among the Central Asian Orogenic Belt. During the Early (1.0-0.8 Ga) and Late (0.8-0.6 Ga) Neoproterozoic orogenic cycles a notable amount of juvenile crust has been formed in subduction-collision settings along with the reworking of the existing Early Precambrian continental crust. The latter is perfectly presented within the North Muya metamorphic block (Anamakit-Muya zone) including the oldest high-pressure subduction-related rocks in the Central Asia. In order to evaluate the process of the juvenile crust formation in the Precambrian continental unit, whole-rock trace elements along with zircon U-Pb ages and Hf-isotopic composition were analyzed in granites of unknown age that intrude the Precambrian volcanic-sedimentary rocks of the Parama series in the southern North Muya Block. Combined geochemical and zircons isotopic studies indicate the formation of granites with the main pulse at ~810 Ma due to partial melting of a juvenile mafic crust accompanied by reworking of the older crustal material from the continental arc basement. The composition of the granites was controlled by processes of intracrustal differentiation together with a probable contamination by older crustal substrate. Geochemistry and age of the studied granites are comparable to the granites of the Muya complex observed in the volcano-plutonic Kelyana-Irokinda zone. It is assumed that the Muya block and the Kelyana-Irokinda zone (terrane) had possibly been parts of the large continental-arc system beyond the Siberia margins.

Original languageEnglish
Pages (from-to)14-30
Number of pages17
JournalPrecambrian Research
Volume280
DOIs
Publication statusPublished - 1 Jul 2016
Externally publishedYes

Keywords

  • Central Asian Orogenic Belt
  • Siberian craton
  • subduction-related magmatism
  • zircon

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