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Abstract <p>The article presents the results of lithological–petrographical and geochemical, including isotopic (δ<sup>13</sup>C, δ<sup>18</sup>O), analyses of carbonate rocks of the Alyarmaut uplift. Three types of Tournaisian–Visean terrigenous–carbonate rocks have been identified: (1) dark gray carbonate shales with increased REE and organic matter contents; (2) light gray marbleized limestones; (3) white thick-slabby limestones. The REE and organic matter contents gradually decrease from the bottom upsection—from the first to the third types. All three types accumulated on an open carbonate platform, the provenance area of which comprised predominantly felsic rocks with the probable subordinate involvement of mafic–ultramafic rocks.</p>

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Early Carboniferous Sedimentary Environments of Western Chukotka (Alyarmaut Uplift)

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • V. E. Zagoskina-Beloshei

摘要

Abstract

The article presents the results of lithological–petrographical and geochemical, including isotopic (δ13C, δ18O), analyses of carbonate rocks of the Alyarmaut uplift. Three types of Tournaisian–Visean terrigenous–carbonate rocks have been identified: (1) dark gray carbonate shales with increased REE and organic matter contents; (2) light gray marbleized limestones; (3) white thick-slabby limestones. The REE and organic matter contents gradually decrease from the bottom upsection—from the first to the third types. All three types accumulated on an open carbonate platform, the provenance area of which comprised predominantly felsic rocks with the probable subordinate involvement of mafic–ultramafic rocks.