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Distribution of Selected Critical Elements in the Carboniferous coal-bearing series of the Upper Silesian and Lublin coal Basins(Poland)

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 273-292页

作者： Ewa KRZESZOWSKA Magdalena KOKOWSKA-PAWLOWSKA Swiatoslaw KRZESZOWSKI Silesian University of Technology GliwicePoland

The distribution of selected critical elements in the sedimentary rocks of the Carboniferous coal-bearing series within the Polish coal Basins is presented.Critical elements such as Be,Mg,Si,P,Sc,V,Co,Y,Nb,In,Sb,La,Ce,Hf,Ta,W,Bi were analysed using inductively-coupled plasma mass spectrometry(ICP/MS).Concentrations of elements such as Sb,Bi,In and,to a slightly lesser extent,Nb,as well as Sc,show average concentrations higher than those from the upper continental crust.The average concentrations of elements like Hf,Mg,P,Y,La,and Ce are slightly lower than in the upper continental crust.Other elements,such as Be,Co,Si,Ta,W and V have average concentrations that are similar,but slightly enriched or slightly depleted,relative to the upper continental crust.The research showed enrichment of some critical elements in the analysed samples,but not high enough that extraction would be economically viable.Statistical methods,which include correlation coefficients between elements and cluster analysis,reveal a strong positive correlation between elements like Be,Bi,Nb,Sc,Ta,W and V.Very high,almost total,positive correlation is also noted between La and Ce.

关键词： geochemistry critical elements coal-bearing series Upper Silesian coal Basin Lublin coal Basin

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Dual Control of Depositional Facies on Uranium Mineralization in coal-bearing series： Examples from the Tuanyushan Area of the Northern Qaidam Basin, NW China

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Acta Geologica Sinica(English Edition) 2018年第2期92卷 733-754页

作者： GUO Biao SHAO Longyi WEN Huaijun HUANG Guangnan ZOU Mingjun LI Yonghong College of Geosciences and Survey Engineering China University of Mining and Technology Beoing 100083 China School of Resources and Environment North China University of Water Resources and Electric Power Zhengzhou 450046 China Qinghai Bureau of coal Geological Exploration Xining 810007 China

The uranium deposits in the Tuanyushan area of northern Qaidam Basin commonly occur in coal-bearing series. To decipher the U-enrichment mechanism and controlling factors in this area, a database of 72 drill cores, including 56 well-logs and 3 sampling wells, was examined for sedimentology and geochemistry in relation to uranium concentrations. The results show that coal-bearing series can influence uranium mineralization from two aspects, i.e., spatial distribution and dynamic control. Five types of uranium-bearing rocks are recognized, mainly occurring in the braided river and braided delta sedimentary facies, among which sandstones near the coals are the most important. The lithological associations of sandstone-type uranium deposits can be classified into three subtypes, termed as U-coal type, coal-U-coal type, and coal-U type, respectively. The coal and fine siliciclastic rocks in the coal- bearing series confined the U-rich fluid flow and uranium accumulation in the sandstone near them. Thus, the coal-bearing series can provide good accommodations for uranium mineralization. coals and organic matters in the coal-bearing series may have served as reducing agents and absorbing barriers. Methane is deemed to be the main acidolysis hydrocarbon in the U-bearing beds, which shows a positive correlation with U-content in the sandstones in the coal-bearing series. Additionally, the 613C in the carbonate cements of the U-bearing sandstones indicates that the organic matters, associated with the coal around the sandstones, were involved in the carbonation, one important component of alteration in the Tuanyushan area. Recognition of the dual control of coal-bearing series on the uranium mineralization is significant for the development of coal circular economy, environmental protection during coal utilization and the security of national rare metal resources.

关键词： coal-bearing series dual control uranium deposits northern Qaidam Basin Tuanyushan

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