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Abstract <p>This article presents the first data on U–Pb LA-ICP-MS radioisotope dating of the <i>Mastodonsaurus</i> tetrapod fauna (Middle Triassic). The radioisotope age (241.6 ± 1.0 Ma) of the deposits, which directly underlie the beds of the Inderian Horizon with <i>Mastodonsaurus</i> fauna in the Kok-Tau section (Caspian basin), indicate that the basement of the Inderian Horizon approximately corresponds to the boundary of the Anisian and Ladinian stages and can be used as an approximate lower age limit of the distribution of this fauna. This radioisotope age, as well as the paleontological data on the Bukobai Horizon of South Urals, allows us to estimate the age of the <i>Mastodonsaurus</i> fauna as entirely Ladinian. A paleogeographic model of sedimentation conditions in the Elton and Inder periods is proposed.</p>

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The Age of the Tetrapod Mastodonsaurus Fauna (Middle Triassic) of the East European Platform: First Data on Radioisotope U–Pb LA-ICP-MS Dating. Article 2. Datings and Sedimentation Model

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • V. V. Silantiev,
  • A. V. Kulikova,
  • I. V. Novikov,
  • A. S. Felker,
  • D. N. Miftakhutdinova,
  • R. R. Gabdullin,
  • K. M. Akhmedenov,
  • D. B. Yakupova,
  • E. M. Nurieva,
  • Ya. Ya. Saetgaleeva

摘要

Abstract

This article presents the first data on U–Pb LA-ICP-MS radioisotope dating of the Mastodonsaurus tetrapod fauna (Middle Triassic). The radioisotope age (241.6 ± 1.0 Ma) of the deposits, which directly underlie the beds of the Inderian Horizon with Mastodonsaurus fauna in the Kok-Tau section (Caspian basin), indicate that the basement of the Inderian Horizon approximately corresponds to the boundary of the Anisian and Ladinian stages and can be used as an approximate lower age limit of the distribution of this fauna. This radioisotope age, as well as the paleontological data on the Bukobai Horizon of South Urals, allows us to estimate the age of the Mastodonsaurus fauna as entirely Ladinian. A paleogeographic model of sedimentation conditions in the Elton and Inder periods is proposed.