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Abstract <p>The Rossosh domain is the least studied fragment of the Archean continental crust of Sarmatia. To determine its age and nature, the first geochemical, geochronological, and Sm–Nd isotope data for felsic volcanics were obtained. The felsic metavolcanics, located in the section together with metabasites and metagraywackes, are represented by sodium metaluminous rhyolites, depleted in lithophile and high field strength elements. The crystallization age of rhyolites was 3.04 Ga. The radiogenic Nd isotopic composition and inherited zircon grains of 3.15 Ga in age suggest juvenile sources for metarhyolites. Comparison of the geochemical and isotopic characteristics and the age of the studied rocks with felsic metavolcanics of the Mikhailovka and Middle Dnieper granite–greenstone areas suggests that the Rossosh domain is a fragment of the Mesoarchean granite–greenstone area of Sarmatia.</p>

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The Rossosh Domain Is a Fragment of the Mesoarchean Granite–Greenstone Area of Sarmatia: Results of Geochronological and Isotopic Studies of Felsic Volcanic Rocks

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • R. A. Terentiev,
  • K. A. Savko,
  • Ye. H. Korish

摘要

Abstract

The Rossosh domain is the least studied fragment of the Archean continental crust of Sarmatia. To determine its age and nature, the first geochemical, geochronological, and Sm–Nd isotope data for felsic volcanics were obtained. The felsic metavolcanics, located in the section together with metabasites and metagraywackes, are represented by sodium metaluminous rhyolites, depleted in lithophile and high field strength elements. The crystallization age of rhyolites was 3.04 Ga. The radiogenic Nd isotopic composition and inherited zircon grains of 3.15 Ga in age suggest juvenile sources for metarhyolites. Comparison of the geochemical and isotopic characteristics and the age of the studied rocks with felsic metavolcanics of the Mikhailovka and Middle Dnieper granite–greenstone areas suggests that the Rossosh domain is a fragment of the Mesoarchean granite–greenstone area of Sarmatia.