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<p>The Middle Pennsylvanian, Langsettian sub-stage Clintwood coal, along with its correlatives, was one of the more important energy resources in eastern Kentucky. The coal thickens from the NE-SW-trending Belfry anticline in central Pike County to the southeast, towards the Virginia-Kentucky border. Much of the thickness increase is in the bright lithotypes below a dull lithology. The bright lithologies transition from a bright clarain + vitrain + fusain lithology to a clarain + fusain lithology to the southeast. Half of the lithotypes in the three analyzed sections exceed 1000-µg/g Rare earth elements + Y + Sc (REYSc) (ash basis). The La<sub>N</sub>/Sm<sub>N</sub> vs. Gd<sub>N</sub>/Yb<sub>N</sub> and La<sub>N</sub>/Sm<sub>N</sub> vs. Ce<sub>N</sub>/Ce<sub>N</sub><i>*</i> plots suggest that the top lithotype may have had best indication of an oxidizing environment. Positive Gd<sub>N</sub>/Gd<sub>N</sub>* and Eu<sub>N</sub>/Eu<sub>N</sub><sup>*</sup> in some of the lithologies suggests that there may have been a hydrothermal influence in the sediment sources and/or in the diagenesis of the coal. Consideration of La<sub>N</sub>/Sm<sub>N</sub> and Zr (µg/g; ash basis), Zr vs. Sr, and V/Cr vs. inertinite/(inertinite + vitrinite) indicates that the dull lithotypes existed in a distinct geochemical environment compared to the brighter lithotypes. The isolation of the dull lithotypes from the bright lithotypes is supported by principal components analysis on inertinite/(inertinite + vitrinite), La<sub>N</sub>/Sm<sub>N</sub>, V/Cr, Sr, and <i>either</i> Zr <i>or</i> Ln(100(TiO<sub>2</sub>)/Al<sub>2</sub>O<sub>3</sub>).</p>

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Petrology and geochemistry of the Middle Pennsylvanian (Langsettian) Clintwood coalbed, Pike County, Kentucky

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年3月6日

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  • James C. Hower,
  • Cortland F. Eble,
  • Shelley D. Hopps,
  • Tonya D. Morgan,
  • Vivian A. Edwards

摘要

The Middle Pennsylvanian, Langsettian sub-stage Clintwood coal, along with its correlatives, was one of the more important energy resources in eastern Kentucky. The coal thickens from the NE-SW-trending Belfry anticline in central Pike County to the southeast, towards the Virginia-Kentucky border. Much of the thickness increase is in the bright lithotypes below a dull lithology. The bright lithologies transition from a bright clarain + vitrain + fusain lithology to a clarain + fusain lithology to the southeast. Half of the lithotypes in the three analyzed sections exceed 1000-µg/g Rare earth elements + Y + Sc (REYSc) (ash basis). The LaN/SmN vs. GdN/YbN and LaN/SmN vs. CeN/CeN* plots suggest that the top lithotype may have had best indication of an oxidizing environment. Positive GdN/GdN* and EuN/EuN* in some of the lithologies suggests that there may have been a hydrothermal influence in the sediment sources and/or in the diagenesis of the coal. Consideration of LaN/SmN and Zr (µg/g; ash basis), Zr vs. Sr, and V/Cr vs. inertinite/(inertinite + vitrinite) indicates that the dull lithotypes existed in a distinct geochemical environment compared to the brighter lithotypes. The isolation of the dull lithotypes from the bright lithotypes is supported by principal components analysis on inertinite/(inertinite + vitrinite), LaN/SmN, V/Cr, Sr, and either Zr or Ln(100(TiO2)/Al2O3).