Case study of the igneous intrusion effect on the mineralogical composition of the Carboniferous coal from Jingxi Coalfield, North China

  • Qiming ZhengEmail author
  • Bo Huang
  • Songlin Shi
  • Shuaixia Liu
  • Xiaoyan Song
  • Zhongyue Lin
  • Qinfu Liu
Original Article


Igneous intrusions significantly affect the mineralogical composition of coal. The Jingxi Coalfield, North China was subjected to the intrusion of a Mesozoic aplite; however, the resulting coal mineralogy has not been well investigated. This paper reports on a study of the mineralogical composition of five coal bench samples collected from the No. M3 coal in the Jingxi Coalfield, which was intruded by an aplite sill along the roof. The minerals present in the highest proportions in the No. M3 coal are margarite–paragonite group mineral (21.4%) and ammonian illite (72.7%), followed by ankerite (4.2%), anatase (0.7%), and rutile (0.9%). The formation of margarite, paragonite and ammonian illite is attributed to the intrusion of the aplite sill. The margarite and paragonite were formed prior to the formation of the ammonian illite. The proportion of the margarite–paragonite group mineral decreases, and the proportion of ammonian illite increases from the sill to the roof. The Ca2+ and K+ are more easily incorporated into the aluminosilicate mineral lattices than Na+ and NH4+, respectively. Thus, the Ca2+/Na+ ratio in the margarite–paragonite group mineral decreases, and the NH4+/K+ ratio in the ammonian illite increases from the sill to the roof. The formation of ankerite is also attributed to the igneous intrusion, but this mineral was formed later than the aluminosilicate minerals. The proportion of ankerite in the coal samples increases from the sill to the roof.


Jingxi Coalfield Igneous intrusion Margarite Paragonite Ammonian illite 



This research was supported by the National Natural Science Foundation of China (Nos. 41502154 and 41672150), and Scientific and Technological Project of Henan Province (No. 182102310016).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Qiming Zheng
    • 1
    Email author
  • Bo Huang
    • 1
  • Songlin Shi
    • 1
  • Shuaixia Liu
    • 1
  • Xiaoyan Song
    • 2
  • Zhongyue Lin
    • 3
  • Qinfu Liu
    • 4
  1. 1.School of Resources and Environment EngineeringHenan University of EngineeringZhengzhouChina
  2. 2.School of Resources & EnvironmentNorth China University of Water Resources and Electric PowerZhengzhouChina
  3. 3.China Coal Geology Engineering CorporationBeijingChina
  4. 4.School of Geological Science and Survey EngineeringChina University of Mining and TechnologyBeijingChina

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