Catagenetic type of manganese ores:REE and isotope(δ^(13)C,δ^(18)O)geochemical features(on the example of the Usa deposit,Russia)  

作　　者：Vladimir N.Kuleshov Andrey Yu.Bychkov Irina Yu.Nikolaeva Maria E.Tarnopolskaia 

机构地区：[1]Geological Institute,Russian Academy of Sciences,Pyzhevskii Per.7,119017 Moscow,Russia [2]Lomonosov Moscow State University,Leninskie Gory,1,119899 Moscow,Russia

出　　处：《Acta Geochimica》2024年第6期1133-1152,共20页地球化学学报（英文）

基　　金：accomplished in accordance with the Research Program of the Geological Institute of the Russian Academy of Sciences。

摘　　要：Chemical(REE and major elements)and isotope(δ^(13)C,δ^(18)O)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(δ^(13)C)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 Mnores.Two major phases and sources are distinguished in the ore-forming process characterized by diff erent chemical(REE and ore elements)and isotope composition:(i)highgrade 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).

关 键 词：Manganese ore REE Isotope composition CATAGENESIS CAMBRIAN Siberia 

分 类 号：P618.32[天文地球—矿床学]