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

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Lithology and Mineral Resources Pub Date : 2025-07-11 DOI:10.1134/S0024490225700129

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

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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.

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基底-上覆元古代沉积层序的碎屑岩：通讯1。黏土岩及其岩石地球化学的主要特征

分析了几个对象（Ai， Prikamsk和Trekhgornaya组，Mukun组和Ust-Ilya组，Staraya Russa和Vasilievsky Ostrov组）中细粒碎屑/粘土岩石的整体化学成分；下Vindhyan组和Gwalior组、Bhima组、Athabasca组、Libby Creek组等)参与元古宙沉积序列，不整合覆在结晶基底上，其初始矿物组成与大多数后太古代粘土岩接近。这些岩石中Zr、Sc和Th的比例表明它们主要是由弱再循环物质组成的。镁铁质火成岩的侵蚀产物在其细粒铝硅塑性物源中所占比例相对较小。这类粘土岩的总体化学组成特征表明，它们的碎屑物质主要来自于碰撞和/或裂陷环境下形成的岩石复合体。

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来源期刊

Lithology and Mineral Resources 地学-地球化学与地球物理

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rock and ore formation with present-day processes. The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as the genetic aspects of the formation of sedimentary and hydrothermal–sedimentary mineral resources. The journal welcomes manuscripts from all countries in the English or Russian language.