Geochemistry of coal thermally-altered by igneous intrusion: A case study from the Pansan Coal Mine of Huainan Coalfield, Anhui, Eastern China

Zhang, Bofei; Chen, Jian; Sha, Jidun; Zhang, Suan; Zeng, Jiye; Chen, Ping; Yao, Duoxi; Liu, Wenzhong; Wang, Xingming; Zhang, Pingsong; Liu, Guijian; Li, Xiuzhi

doi:10.1016/j.gexplo.2020.106532

Cited by 8 publications

(3 citation statements)

References 93 publications

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“…the Balkan and Dobrudzha bituminous coals, and especially the Svoge anthracite), however, the occurrence of epigenetic quartz mineralization within cracks, can be considered as the most probable source of the element. Similar trend is also reported by Chen et al (2014) and Zhang et al (2020) for Chinese coal.…”

Section: Resultssupporting

confidence: 89%

“…However, since plant ash typically rarely exceed 2 wt% (Misra et al, 1993;Kabata-Pendias, 2010), its influence on Si contents is presumed to be more pronounced only in very low ash coals. For medium to high ash coals like the studied herein, the main source of Si is presumed to be the siliciclastic input from basin's catchment areas (Beaton et al, 1991;Warwick et al, 1997;Spears, Zheng, 1999;Chen et al, 2014;Zhang et al, 2020). Quartz, feldspars and clay minerals, which are typical constituents in soils formed after felsic intrusive and metamorphic rocks, are the most common sources of the element.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, Querol et al (1997aQuerol et al ( , b, 2001a, Ward et al (1999), Karayigit et al (2000aKarayigit et al ( , 2020 and Alastuey et al (2001) accept a priori the exclusive relationship of Si with the clay minerals and use the correlation of the element with the alumino-silicate part of the ash to determine its mode of occurrence. Chen et al (2014) and Zhang et al (2020) report increased Si contents in the form of quartz as a result of the circulation of Si-rich hydrothermal solutions within the coal seams. The mineral form of Si in the studied basins is mainly associated with clay minerals and quartz, although a number of other predominantly terrigenous minerals (i.e.…”

Section: Resultsmentioning

confidence: 99%

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Silicon and aluminum in Bulgarian coals

Zdravkov¹

2021

Rev. Bulg. Geol. Soc.

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The presence and distribution of Si and Al in 19 Bulgarian coal basins and deposits, belonging to 8 coal provinces, were studied. Coals are of different rank (lignite to anthracite) and age (Late Carboniferous to Pliocene). The presence of both studied major elements depends strongly on: i) their concentration within the basin’s provenance; ii) the extent of terrigenous supply; iii) environmental acidity during peat formation; and iv) the presence and composition of epigenetic mineralization within the coal seams. Because of the presumed abundant terrigenous supply, the concentrations of both Si and Al are higher than the world average for most of the studied coals. Exceptions are the Maritsa-West, Burgas, Staniantsi, Oranovo, Chukurovo and Pernik Basins, for which reduced terrigenous supply can be suggested. For most of the basins, both Si and Al demonstrate good positive correlation with the ash yields, thus arguing for predominant inorganic affinity. Relatively low Si/Al ratios (typically <2) and good positive correlation between Si and Al (ro>0.6) imply the predominant role of the clay mineral assemblages as the main source of the elements in coal. Quartz is presumed to have dominant role only in Maritsa-West Basin. Poorer or negative correlations with the ash yields in part of the studied basins (i.e. Svoge, Maritsa-West, Sofia, Burgas and Dobrudzha Basins) suggest either mixed or predominantly organic affinity of the elements. Release of Si and Al from the clay minerals during the peat formation/diagenesis and subsequent formation of organo-metallic complexes is considered to responsible for such affinity.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Silicon and aluminum in Bulgarian coals

Zdravkov¹

2021

Rev. Bulg. Geol. Soc.

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Geochemical and mineralogical responses to thermal alteration by an igneous intrusion in the Dashucun Coal Mine of the Fengfeng coalfield, Hebei, North China

Wang,

Dai,

Esterle

et al. 2024

Applied Geochemistry

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Influence of magma intrusion on coal geochemical characteristics: a case study of Tiefa Daxing coal mine

Fu,

Liu,

et al. 2024

Sci Rep

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Magma intrusion has an important influence on the physical and mechanical properties of coal and rock. In the area of magma intrusion, disasters such as gas outburst are prone to occur. Revealing its invasion law will be conducive to disaster management and energy development. For this purpose, changes in industrial analysis components of coal, mineral composition, major oxides, trace elements, and rare earth elements of coal under the thermal metamorphism of magma intrusion were analyzed. It is found that the moisture and volatile matter contents of the thermally affected coals in the mining face are generally lower than that of normal coals, while moisture and volatile matter contents are reduced towards to the magma intrusion contact. For example, the moisture and volatile matter of coal sample M01 decreased by 64.6% and 38.6% respectively compared with coal sample M05. During magma intrusion, some minerals remain on the surface of the coal body, resulting in changes in the mineral composition of the coal body. The decrease in carbon atom net spacing, the increase in crystallite aggregation and ductility, and aromaticity in thermally affected coals have a positive impact on the improvement of coal metamorphism. Due to the influences of magmatic intrusion, the variation rules of major oxides in coal are different, and the closer to the magmatic intrusion zone, the easier the major oxides are to be depleted. However, magma intrusion will not lead to the loss of all major oxides in thermally affected coals, such as content of CaO is 54.8%, which is higher than that of coal not affected by magmatic hydrothermal fluid. Most of the trace elements in the thermally affected coals of the No. 9 coal seam are depleted. The contents of rare earth elements are low on the whole coalbasis, with an average of 29.48 μg/g, and the distribution pattern towards to magmatic intrusion shows a wide and gentle “V” curve with left high and right low, showing the characteristics of enrichment of light rare earth elements.

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Geochemistry of coal thermally-altered by igneous intrusion: A case study from the Pansan Coal Mine of Huainan Coalfield, Anhui, Eastern China

Cited by 8 publications

References 93 publications

Silicon and aluminum in Bulgarian coals

Silicon and aluminum in Bulgarian coals

Geochemical and mineralogical responses to thermal alteration by an igneous intrusion in the Dashucun Coal Mine of the Fengfeng coalfield, Hebei, North China

Influence of magma intrusion on coal geochemical characteristics: a case study of Tiefa Daxing coal mine

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