Abstract
Mineralogical, petrographic, and geochemical studies of mafic granulites of the South Muya Block (Central Asian Orogenic Belt) have been carried out. The granulite protoliths were olivine- and plagioclase- rich cumulates of ultramafic–mafic magmas with geochemical affinities of suprasubduction rocks. The isotope–geochemical characteristics of the granulites indicate the enriched nature of their source, associated with recycling into the mantle of either ancient crust or oceanic sediments, or intracrustal contamination of melts at the basement of the ensialic arc. Formation of garnet-bearing parageneses has occurred during high-pressure granulite metamorphism associated with accretion in the eastern part of the Baikal–Muya composite terrane.
Highlights
The Neoproterozoic to Cenozoic collage of the Central Asian Orogenic Belt is well-known to include Precambrian continental blocks and microcontinents traditionally attributed to rifting of Siberia or Gondwana prior to CAOB assembly that significantly contributed into the geochemical and isotopic composition of younger subduction- and accretion-related crustal lithologies via processes of crust-mantle interaction and crustal recycling
In the Neoproteorozoic Baikal-Muya terrane, the Anamakit-Muya zone has been found to resemble variable to profound isotopic signatures of the ancient crust recently confirmed by whole-rock Nd and in-situ zircon studies of the high-grade Muya block rocks [Shatskii et al, 2014; Shatsky et al, 2015; Skuzovatov et al, 2016a, 2016b, 2017]
The ancient crust might serve as a basement for a Neoproterozoic continental arc possibly related to a single Tuva-Mongol-Muya continental domain [Skuzovatov et al, 2016b]
Summary
The Neoproterozoic to Cenozoic collage of the Central Asian Orogenic Belt is well-known to include Precambrian continental blocks and microcontinents traditionally attributed to rifting of Siberia or Gondwana prior to CAOB assembly that significantly contributed into the geochemical and isotopic composition of younger subduction- and accretion-related crustal lithologies via processes of crust-mantle interaction and crustal recycling. For citation: Skuzovatov S.Yu., Noskova Yu.V., Dril S.I., Wang K.-L., Iizuka Y., 2017.
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