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Abstract <p>The study examines petrogeochemical characteristics of Late Permian granitoids in the Gamov batholith. The petrological and geochemical data indicate the presence of two groups of granitoids: S- and I-type. The rocks are predominantly magnesian, calcareous and calc-alkaline, and moderately and highly aluminous. They demonstrate higher Rb, Ba, Th, U, K, Pb, and LREE concentrations and lower Nb, Sr, P, and Ti concentrations. The distribution of rare earth elements is moderately fractionated. The topology of the distribution spectrum of rare elements is similar for all types of rocks, differing only in the size of anomalies of individual elements. An evaluation of the PT parameters of crystallization of the main phase—biotite–amphibole granites and granodiorites—showed that they formed at a temperature of 666–818°C and pressure of 2.1–2.8 kbar. The Nd isotopic composition of granites indicates the involvement of crustal and mantle material in magma formation, the contribution of the latter reaching 50%. The emplacement of the Gamov batholith is associated with closure of the Solonker Paleo-Asian Ocean in the Late Permian.</p>

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Late Permian Granitoids of the Gamov Batholith (Southwestern Primorye): Geochemical Features and Petrogenesis

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • A. A. Vel’demar,
  • G. M. Vovna

摘要

Abstract

The study examines petrogeochemical characteristics of Late Permian granitoids in the Gamov batholith. The petrological and geochemical data indicate the presence of two groups of granitoids: S- and I-type. The rocks are predominantly magnesian, calcareous and calc-alkaline, and moderately and highly aluminous. They demonstrate higher Rb, Ba, Th, U, K, Pb, and LREE concentrations and lower Nb, Sr, P, and Ti concentrations. The distribution of rare earth elements is moderately fractionated. The topology of the distribution spectrum of rare elements is similar for all types of rocks, differing only in the size of anomalies of individual elements. An evaluation of the PT parameters of crystallization of the main phase—biotite–amphibole granites and granodiorites—showed that they formed at a temperature of 666–818°C and pressure of 2.1–2.8 kbar. The Nd isotopic composition of granites indicates the involvement of crustal and mantle material in magma formation, the contribution of the latter reaching 50%. The emplacement of the Gamov batholith is associated with closure of the Solonker Paleo-Asian Ocean in the Late Permian.