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Abstract <p>Analysis of the bulk chemical composition of fine-grained clastic/clay rocks in several objects (Ai, Prikamsk, and Trekhgornaya formations; Mukun Group and Ust-Ilya Formation, Staraya Russa, and Vasilievsky Ostrov formations; clay rocks of the lower Vindhyan and Gwalior, Bhima, Athabasca, Libby Creek groups, and others), which participate in the Proterozoic sedimentary sequences unconformably overlying the crystalline basement, showed that their initial mineral composition was close to that of most post-Archean clay rocks. The ratio of Zr, Sc, and Th in these rocks suggests that they are composed predominantly of weakly recycled material. The share of erosion products of mafic igneous rocks among the sources of their fine-grained aluminosiliciclastics was relatively small. The features of the bulk chemical composition of such clay rocks suggest that the detrital material for them was supplied mainly from rock complexes formed in collisional and/or riftogenic settings.</p>

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Clastic Rocks of the Basement-Overlying Proterozoic Sedimentary Sequences: Communication 1. Clay Rocks and Main Features of Lithogeochemistry

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • A. V. Maslov,
  • V. N. Podkovyrov,
  • A. K. Khudoley,
  • A. V. Kuptsova

摘要

Abstract

Analysis of the bulk chemical composition of fine-grained clastic/clay rocks in several objects (Ai, Prikamsk, and Trekhgornaya formations; Mukun Group and Ust-Ilya Formation, Staraya Russa, and Vasilievsky Ostrov formations; clay rocks of the lower Vindhyan and Gwalior, Bhima, Athabasca, Libby Creek groups, and others), which participate in the Proterozoic sedimentary sequences unconformably overlying the crystalline basement, showed that their initial mineral composition was close to that of most post-Archean clay rocks. The ratio of Zr, Sc, and Th in these rocks suggests that they are composed predominantly of weakly recycled material. The share of erosion products of mafic igneous rocks among the sources of their fine-grained aluminosiliciclastics was relatively small. The features of the bulk chemical composition of such clay rocks suggest that the detrital material for them was supplied mainly from rock complexes formed in collisional and/or riftogenic settings.