伊敏盆地伊敏组煤层地球化学特征及沉积环境

doi:10.11720/wtyht.2024.1360

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Abstract

The Yimin Formation hosts shallow and stable coal seams, which are rich in coal resources and suitable for open-pit mining. To ascertain the distributions of coal seams in the Yimin Formation and reveal the coal accumulation patterns, it holds critical geological significance to identify the provenance setting and coal-forming environment using geochemical methods. This study systematically collected coal samples from drilling cores in the study area for testing and analysis of coal quality.Furthermore, this study reconstructed the paleogeographic information and sedimentary environment during the formation of coal seams for comprehensive research. The results show that:(1) The coal seams of the Yimin Formation are primarily composed of lignite, with durain being the dominant component, followed by fusain. Their coal samples exhibited average vitrinite reflectance (R₀) of 0.37%, average oil content of 7.66% in raw coal, and average total sulfur content of 1.32%; (2) The average CIA value of 58.45 suggests that the source area experienced primary to moderate weathering. The average w(Si)/w(Al) ratio of 2.72 indicates that minerals in the coal originated from terrestrial argillaceous sediments. The ash index (K) of 0.34 implies that the coal seams formed in a low-level peat swamp environment. The w(Sr)/w(Cu), w(Sr)/w(Ba), w(Mg)/w(Al) (m), and w(Ca)/w(Fe) (n) ratios signify warm and humid paleoclimate, significant evaporation, and high salinity of ancient water bodies during the coal seam sedimentation stage. The Sr, Ba, and w(Ba)/w(Ga) values denote that the coal seams resulted from continental sedimentation. The w(V)/[w(V)+w(Ni)], w(V)/w(Cr), w(Ni)/w(Co), and w(V)/w(Sc) ratios demonstrate that the coal seams formed under anoxic reducing conditions. This study posited that the early sedimentary stage of the Yimin Formation saw the reduced continental faulted basin, humid climate, and lake siltation, forming a peat swamp environment in the deltaic plain, thus creating favorable conditions for coal generation and accumulation.

Key words： lower Cretaceous coal seam quality element abundance sedimentary environment Yimin Basin

Received: 18 August 2023 Published: 08 January 2025

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	Articles by authors
	Bin Li
	Yue-Heng Zhang
	Lian-Han Hong
	Jing-Yi Yuan
	Ting Gao
	Zhen-Guo Dong

Cite this article:

Bin Li,Yue-Heng Zhang,Lian-Han Hong, et al. Geochemical characteristics and sedimentary environment of coal seams in the Yimin Formation in the Yimin Basin[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1577-1587.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1360 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1577

The structural outline of Hailar settlement area and sample location

The comprehensive histogram of lower Cretaceous coal bearing strata

The coal quality characteristics and macerals

The elemental composition and atomic ratio of coal

The raw coal tar yield at low temperature dry distillation 600 ℃

The main element content of coal ash

The treace element content of coal ash ^[5] 10^-6

Characteristics of CIA value(a), w(Si)/w(Al) value(b), K value(c), m value(d) and n value(e) of coal groups 15 and 16 of Yimin Formation

The contents of Sr(a),Ba(b) and w(Ba)/w(Ga) value(c) characteristics of coal groups 15 and 16 of Yimin Formation

Characteristics of V/Ni value, V/Cr value and Co value of coal groups 15 and 16 of Yimin Formation

w(Sr)/w(Cu) value characteristics of coal groups 15 and 16 of Yimin Formation

w(Sr)/w(Ba) value(a) and w(Th)/w(U) value(b) characteristics of coal groups 15 and 16 of Yimin Formation

Sedimentary evolution model of Damoguaihe Formation and Yimin Formation

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