Catagenetic type of manganese ores: REE and isotope (δ13C, δ18O) geochemical features (on the example of the Usa deposit, Russia)

IF 1.4 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Acta Geochimica Pub Date : 2024-05-23 DOI:10.1007/s11631-024-00701-6

Vladimir N. Kuleshov, Andrey Yu. Bychkov, Irina Yu. Nikolaeva, Maria E. Tarnopolskaia

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Abstract

Chemical (REE and major elements) and isotope (δ¹³C, δ¹⁸O) composition of carbonate manganese ores and manganese-bearing carbonates of the Usa deposit (Siberia, Russia) were studied. Received data on the composition of REE exhibit both the distinct negative (Ce/Ce*_PAAS < 1) and positive (Ce/Ce*_PAAS˃1) cerium anomalies and the positive Eu-anomaly (Eu/Eu*_PAAS˃1). Negative Eu-anomalies are not observed. The contents of Mn, Fe, REE, and Ce-anomalies show a positive correlation with each other. Ce-anomalies and the amount of manganese and REE in relation to the carbon isotope composition (δ¹³C) show a negative relationship and indicate that oxidized carbon of organic matter played an important role in the concentration of manganese and REE in manganese ores. The chemical and isotope composition of examined rocks indicates on secondary formation of Mn-ores. Two major phases and sources are distinguished in the ore-forming process characterized by different chemical (REE and ore elements) and isotope composition: (i) high-grade manganese ores (with high contents of REE and light carbon isotope composition) and (ii) low-grade manganese ores (with low contents of REE and heavy carbon isotope composition).

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锰矿的成因类型：REE 和同位素（δ13C、δ18O）地球化学特征（以俄罗斯乌萨矿床为例）

研究了乌萨矿床（俄罗斯西伯利亚）碳酸盐锰矿和含锰碳酸盐的化学（REE和主要元素）和同位素（δ13C、δ18O）组成。所收到的有关 REE 成分的数据显示出明显的负（Ce/Ce*PAAS <1）和正（Ce/Ce*PAAS˃1）铈异常以及正 Eu 异常（Eu/Eu*PAAS˃1）。未观察到负 Eu 异常。锰、铁、稀土元素和铈异常的含量呈正相关。锰、铁、REE和C-异常的含量与碳同位素组成（δ13C）呈负相关，表明有机质的氧化碳对锰矿石中锰、REE的富集起着重要作用。所考察岩石的化学成分和同位素组成表明锰矿是二次形成的。在矿石形成过程中，有两个主要阶段和来源，它们具有不同的化学（REE和矿石元素）和同位素组成：（i）高品位锰矿石（REE和轻碳同位素组成含量高）和（ii）低品位锰矿石（REE和重碳同位素组成含量低）。

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来源期刊

Acta Geochimica GEOCHEMISTRY & GEOPHYSICS-

CiteScore

2.80

自引率

6.20%

发文量

1134

期刊介绍： Acta Geochimica serves as the international forum for essential research on geochemistry, the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth‘s crust, its oceans and the entire Solar System, as well as a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The journal focuses on, but is not limited to the following aspects: • Cosmochemistry • Mantle Geochemistry • Ore-deposit Geochemistry • Organic Geochemistry • Environmental Geochemistry • Computational Geochemistry • Isotope Geochemistry • NanoGeochemistry All research articles published in this journal have undergone rigorous peer review. In addition to original research articles, Acta Geochimica publishes reviews and short communications, aiming to rapidly disseminate the research results of timely interest, and comprehensive reviews of emerging topics in all the areas of geochemistry.