Influence of lamprophyre sills on coal metamorphism, coalbed gas composition and coalbed gas occurrence in the Tongxin Minefield, Datong Coalfield, China

Chen, Yilin; Qin, Yong; Ji, Ming; Duan, Hongfei; Wu, Caifang; Shi, Qingmin; Zhang, Xiaoyang; Wang, Ziwei

doi:10.1016/j.coal.2019.103286

Cited by 19 publications

(6 citation statements)

References 54 publications

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“…The 5# coal seam as a whole shows a monoclinic structure that gradually decreases from the southeast to the northwest, and the core of the backslope is located in the southeast part of the study area. Faults and folds are relatively developed in the vicinity of the southeast part of the area, and most of them are oriented in the north 30° east direction . The specific location of the study area, the tectonic contour of the top plate of the 5# coal seam, and the CBM hydrological parameter wells (145 wells) and gas sample test wells (48 wells) are shown in Figure .…”

Section: Geological Settingsmentioning

confidence: 99%

Geological Control Mechanism of Coalbed Methane Gas Component Evolution Characteristics in the Daning-Jixian Area, Ordos Basin, China

Zhao,

Liu,

Cai

et al. 2023

Energy Fuels

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Section: Geological Settingsmentioning

confidence: 99%

Geological Control Mechanism of Coalbed Methane Gas Component Evolution Characteristics in the Daning-Jixian Area, Ordos Basin, China

Zhao,

Liu,

Cai

et al. 2023

Energy Fuels

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“…The coal-bearing strata of the Datong coalfield include the Jurassic Datong, Lower Permian Shanxi, and Upper Carboniferous Taiyuan formations (Figure 2). At present, the Jurassic coal seam has been exhausted, and exploitation has turned to the underlying Carboniferous-Permian coal seams [21].…”

Section: Coal-bearing Stratamentioning

confidence: 99%

“…Intrusions dating back to the Indosinian period are dominated by mafic to ultramafic lamprophyre and carbonatite [49,51], whereas rocks that intruded in the Yanshan period are mainly diabase and basaltic andesite [52]. The detailed lithological characteristics of the igneous intrusions in the Datong coalfield were described in Chen et al [21]. In the practical mining process, sills and dikes were encountered in the Shan 4 , 2, 3 −1 , 3 −2 , 5 (3)(4)(5), and 8 coal seams in the Tashan Coal Mine.…”

Section: Igneous Intrusionmentioning

confidence: 99%

“…Igneous intrusions in coal-bearing sedimentary basins have been reported in many countries, such as the USA [1][2][3], South Africa [4,5], Australia [6][7][8], Spain [9], India [10][11][12][13], Turkey [14][15][16], and China [17][18][19][20][21]. Igneous intrusions in coal-bearing strata greatly affect the safety of the mining process and have impacts on coal quality, petrography, mineralogy, and geochemistry.…”

Section: Introductionmentioning

confidence: 99%

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Petrography, Mineralogy, and Geochemistry of Thermally Altered Coal in the Tashan Coal Mine, Datong Coalfield, China

Song

Saalidong

et al. 2021

Minerals

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A suite of coal samples near a diabase dike were collected to investigate the petrographic, mineralogical, and geochemical characteristics of thermally altered coal in Datong Coalfield, China. Proximate analysis, vitrinite reflectance measurement, and petrographic analysis were applied to identify and characterize the alteration halo; optical microscope observation, qualitative X-ray diffractometry, and SEM-EDS were applied to study the phases, occurrence, and composition of minerals; XRF, ICP-MS, and AFS were applied to determine concentrations of major and trace elements; and the occurrence modes of elements were studied by correlation and hierarchical cluster analysis as well as SEM-EDS. The results demonstrated that the 3.6 m dike has caused an alteration halo of approximately 2 m in diameter. In addition, the thermally altered coals were characterized by high vitrinite reflectance, low volatile matter, and the occurrence of thermally altered organic particles. Dolomite and ankerite in the thermally altered coal may be derived from hydrothermal fluids, while muscovite and tobelite may be transformed from a kaolinite precursor. The average concentration of Sr in the Tashan thermally altered coal reached 1714 μg/g, which is over 12 times that of the Chinese coal; the phosphate minerals and Sr-bearing kaolinite account for this significant enrichment. The cluster analysis classified elements with geochemical associations into four groups: group 1 and 2 were associated with aluminosilicates, clays, and carbonates and exhibited enrichment in the coal/rock contact zone, indicating that the dike may be the source of the elements; group 3 included P2O5, Sr, Ba, and Be, which fluctuate in coals, suggesting that their concentrations were influenced by multiple-factors; group 4 did not manifest obvious variations in coals, implying that the coal itself was the source.

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“…During the production process of some coal mines, magmatic rocks' intrusion into the coal seams has been observed [1]. The intrusion of magmatic rocks into the coal seams results in the waste of coal resources, and abolishes the quality and reduces the industrial value of coal, while also leading to many unforeseen hazards in coal mining [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Transient electromagnetic characteristics of coal seams intruded by magmatic rocks

et al. 2022

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The intrusion of magmatic rocks into coal seams affects the coal quality and leads to unforeseen hazards in safety of the coal mines’ production. This paper summarizes the mechanism of magmatic rocks intruding into coal seams, depicts the electromagnetic characteristics of the coal seams intruded by magmatic rocks, briefly describes the characteristics of transient electromagnetic method (TEM), and introduces the method of detection by TEM and the data processing steps. Then, the effectiveness of TEM in detecting the ranges of the coal seams intruded by magmatic rocks is theoretically analysed. It is observed that after the intrusion of magmatic rocks in the coal seams, the electromagnetic characteristics (secondary field potential and resistivity) will be dramatically affected, namely high secondary field potential and low resistivity. For experimental verification purposes, this study selects the test project of the Tongxin Minefield in the Datong Coalfield in Shanxi, China as an example, and the accuracy for the detection of the ranges of the coal seams intruded by magmatic rock using TEM is successfully verified.

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Influence of lamprophyre sills on coal metamorphism, coalbed gas composition and coalbed gas occurrence in the Tongxin Minefield, Datong Coalfield, China

Cited by 19 publications

References 54 publications

Geological Control Mechanism of Coalbed Methane Gas Component Evolution Characteristics in the Daning-Jixian Area, Ordos Basin, China

Geological Control Mechanism of Coalbed Methane Gas Component Evolution Characteristics in the Daning-Jixian Area, Ordos Basin, China

Petrography, Mineralogy, and Geochemistry of Thermally Altered Coal in the Tashan Coal Mine, Datong Coalfield, China

Transient electromagnetic characteristics of coal seams intruded by magmatic rocks

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