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Abstract <p>The study focuses on substantiating the hypothesis of the two-stage and two-level formation of the Darya Complex, which was proposed in the first article of the series. Isotopic and petrogeochemical studies of magmatic rocks from the Dar’ya Complex revealed that primary melts of alkaline ultrabasic and basic rocks are products of the deep mantle level, which formed under a peculiar fluid regime with the involvement of H<sub>2</sub>O and CO<sub>2</sub> from a mantle source (Bulk Silicate Earth (BSE) or Primitive Mantle (PM type) variably and locally metasomatized and approaching the Enriched Mantle type I (EM-I) composition. Trace element and isotope systematics was found to be consistent with the hypothesis of the origin of ultrabasic and basic alkaline melts of the complex through the decompression melting of an enriched peridotite source in the asthenospheric mantle. REE modelling also suggests that the alkaline ultrabasic and basic rocks of the complex may have formed by partial melting of a carbonated garnet-bearing peridotite source. Isotopic and petrogeochemical characteristics of the magmatic rocks of the complex indicate that the evolution of each of the primary magmas was driven by the fractional crystallization and crustal contamination. The formation of alkaline mesites and salites is associated with the different-scale selective assimilation of crustal material by high-temperature, fluidized, basic mantle magmas during their ascent to the surface. Geological and compositional data on the Dar’ya svyatonosites demonstrate that melt hybridization with carbonate matter from the enclosing rocks of magma chambers played a critical role in their formation.</p>

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Petrogenesis and Geodynamics of the Formation of the Dar’ya Foidolite–Foidosyenite Complex of the Ketkap–Yuna Magmatic Province of the Aldan Shield (Russia) from Petrogeochemical Data: Article 2—Petrogenesis

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • V. F. Polin,
  • N. V. Zarubina

摘要

Abstract

The study focuses on substantiating the hypothesis of the two-stage and two-level formation of the Darya Complex, which was proposed in the first article of the series. Isotopic and petrogeochemical studies of magmatic rocks from the Dar’ya Complex revealed that primary melts of alkaline ultrabasic and basic rocks are products of the deep mantle level, which formed under a peculiar fluid regime with the involvement of H2O and CO2 from a mantle source (Bulk Silicate Earth (BSE) or Primitive Mantle (PM type) variably and locally metasomatized and approaching the Enriched Mantle type I (EM-I) composition. Trace element and isotope systematics was found to be consistent with the hypothesis of the origin of ultrabasic and basic alkaline melts of the complex through the decompression melting of an enriched peridotite source in the asthenospheric mantle. REE modelling also suggests that the alkaline ultrabasic and basic rocks of the complex may have formed by partial melting of a carbonated garnet-bearing peridotite source. Isotopic and petrogeochemical characteristics of the magmatic rocks of the complex indicate that the evolution of each of the primary magmas was driven by the fractional crystallization and crustal contamination. The formation of alkaline mesites and salites is associated with the different-scale selective assimilation of crustal material by high-temperature, fluidized, basic mantle magmas during their ascent to the surface. Geological and compositional data on the Dar’ya svyatonosites demonstrate that melt hybridization with carbonate matter from the enclosing rocks of magma chambers played a critical role in their formation.