恩奇瓦宁（Nchwaning）锰矿藏岩石和矿石的 REE 地球化学特征和成因（南非卡拉哈里锰矿区

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Lithology and Mineral Resources Pub Date : 2024-09-02 DOI:10.1134/S0024490224700639

V. N. Kuleshov, A. Yu. Bychkov, A. I. Brusnitsyn

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引用次数: 0

摘要

摘要对Nchwaning矿（卡拉哈里锰矿区Hotazel地层）的母岩（铁硅质岩）和锰矿石的稀土元素（REE）进行了研究。锰矿石和母岩（铁硅质岩）的一个重要特征是存在负向和正向的铈（Ce/Ce*）和铕（Eu/Eu*）异常。这证明了锰矿石形成的复杂而漫长的历史。在沉积（热液在水下排放）和含矿地层随后的热液转化过程中，具有负铈异常（Ce/Ce*）的浅水盆地的初始含金属（锰、铁）沉积物在不同的成岩阶段富含铕（正Eu/Eu*）。锰的来源可能是下伏昂格鲁克地层的玄武安山岩。

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Features of the REE Geochemistry and Genesis of Rocks and Ores of the Nchwaning Manganese Deposit (Kalahari Manganese Field, South Africa)

Rare earth elements (REE) of the host rocks (Fe-siliceous rocks) and manganese ores of the Nchwaning Mine (Hotazel Formation, Kalahari manganese field) were studied. An important feature of manganese ores and host rocks (Fe-silicites) is the presence of negative and positive cerium (Ce/Ce*) and europium (Eu/Eu*) anomalies. This testifies to the complex and long history of the formation of manganese ores. Initial metal-bearing (Mn, Fe) sediments of a shallow-water basin with a negative cerium anomaly (Ce/Ce*) were enriched in europium (positive Eu/Eu*) at different stages of lithogenesis both during sedimentation (underwater discharge of hydrothermal fluids), and subsequent processes of hydrothermal transformation of the ore-bearing strata. The source of manganese could be basaltic andesites of the underlying Ongeluk Formation.

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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.