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<p><b>Abstract</b>—Variably retrogressed eclogites and amphibolites from the North Muya block (Eastern Siberia) bear disseminated pyrite + chalcopyrite ± pyrrhotite mineralization of metasomatic origin. Fluid metasomatism led to the precipitation of pyrite with contrasting δ<sup>34</sup>S signatures (from −10 to +9‰) produced by oxidized (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\text{SO}}_{4}^{{2 - }}\)</EquationSource> <!--PetrEng2670022Skuzovatov-m1--> </InlineEquation>) or reduced (H<sub>2</sub>S or HS<sup>−</sup>) sulfur from a fluid. The data indicate contrasting sulfur reservoirs in the deep orogenic lithosphere, which were controlled by devolatilization of variably oxidized metasediments.</p>

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Sulfur Isotope Heterogeneity of Eclogites and the Scales of Fluid Mass-Transfer in the Root Zones of Subduction-Collision Orogens (North Muya Block, Northeastern Transbaikalia)

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • S. Yu. Skuzovatov,
  • Yu. I. Tarasova,
  • V. N. Reutsky,
  • T. A. Velivetskaya,
  • V. S. Shatsky

摘要

Abstract—Variably retrogressed eclogites and amphibolites from the North Muya block (Eastern Siberia) bear disseminated pyrite + chalcopyrite ± pyrrhotite mineralization of metasomatic origin. Fluid metasomatism led to the precipitation of pyrite with contrasting δ34S signatures (from −10 to +9‰) produced by oxidized ( \({\text{SO}}_{4}^{{2 - }}\) ) or reduced (H2S or HS−) sulfur from a fluid. The data indicate contrasting sulfur reservoirs in the deep orogenic lithosphere, which were controlled by devolatilization of variably oxidized metasediments.