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Title: Submicron-scale mineralogy of lithotypes and the implications for trace element associations: Blue Gem coal, Knox County, Kentucky

Abstract

Transmission electron microscopy accompanied by energy-dispersive spectroscopy and selected area electron diffraction of density-gradient separates from two lithotypes of the low-ash, low-sulfur Blue Gem coal, eastern Kentucky, revealed an array of previously unrecognized (in this coal, and arguable in most others) sub-micron minerals, some <10 nm in size. The first sample representing the 1.22–1.24 specific gravity fraction of the middle bench contains a mineral identified as a La-, Ce-, Nd-bearing monazite; other minerals with CrFe, CuFeS, FeZn-S, and Pb; and areas, probably comprising agglomerates of several grains, if not several minerals, with concentrations of Mg, Ca, Ti, Fe, Zn, Zr, and Mo. The second sample representing the 1.30–1.31 specific gravity fraction of the basal lithotype has aggregates of particles enriched in Mg, Ca, Ti, and Fe. Individual grains not specifically quantified include CrNiMnCuFeS, AgS, and CuS. Detailed investigation of one area (most of the variation within a <4 μm 2 region) demonstrates the presence of greenockite (CdS); minute phases containing NiCoGe and AgCdBi, the latter with a more evident S association than the former; metallic Bi; nisnite (Ni 3Sn); silver cadmium; manganosite (MnO); and siderite. Some minerals, such as the monazite, are most likely of detrital or tuffaceous origin. Manymore » of the other assemblages could be of hydrothermal origin, a hypothesis supported by known regional geochemical and coal rank trends, but not previously demonstrated in mineral assemblages at the 10's of nm scale in this region.« less

Authors:
 [1];  [2];  [3];  [4];  [1]
  1. Univ. of Kentucky, Lexington, KY (United States). Center for Applied Energy Research
  2. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). National Center for Earth and Environmental Nanotechnology Infrastructure (NanoEarth)
  3. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). Dept. of Geosciences; Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Subsurface Science and Technology Group and Energy and Environment Directorate
  4. Southern Illinois Univ., Carbondale, IL (United States). Dept. of Geology
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE; National Nanotechnology Coordinated Infrastructure (NNCI); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States). National Center for Earth and Environmental Nanotechnology Infrastructure (NanoEarth); National Science Foundation (NSF); Univ. of Kentucky, Lexington, KY (United States)
OSTI Identifier:
1434657
Grant/Contract Number:  
ECCS 1542100; CBET-1510861; AC05-76RL01830
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
International Journal of Coal Geology
Additional Journal Information:
Journal Name: International Journal of Coal Geology; Journal ID: ISSN 0166-5162
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 58 GEOSCIENCES; Rare earth elements; Transmission electron microscopy; Low-ash coal; Silver; Cadmium

Citation Formats

Hower, James C., Berti, Debora, Hochella, Michael F., Rimmer, Susan M., and Taulbee, Darrell N. Submicron-scale mineralogy of lithotypes and the implications for trace element associations: Blue Gem coal, Knox County, Kentucky. United States: N. p., 2018. Web. doi:10.1016/J.COAL.2018.04.006.
Hower, James C., Berti, Debora, Hochella, Michael F., Rimmer, Susan M., & Taulbee, Darrell N. Submicron-scale mineralogy of lithotypes and the implications for trace element associations: Blue Gem coal, Knox County, Kentucky. United States. doi:10.1016/J.COAL.2018.04.006.
Hower, James C., Berti, Debora, Hochella, Michael F., Rimmer, Susan M., and Taulbee, Darrell N. Mon . "Submicron-scale mineralogy of lithotypes and the implications for trace element associations: Blue Gem coal, Knox County, Kentucky". United States. doi:10.1016/J.COAL.2018.04.006.
@article{osti_1434657,
title = {Submicron-scale mineralogy of lithotypes and the implications for trace element associations: Blue Gem coal, Knox County, Kentucky},
author = {Hower, James C. and Berti, Debora and Hochella, Michael F. and Rimmer, Susan M. and Taulbee, Darrell N.},
abstractNote = {Transmission electron microscopy accompanied by energy-dispersive spectroscopy and selected area electron diffraction of density-gradient separates from two lithotypes of the low-ash, low-sulfur Blue Gem coal, eastern Kentucky, revealed an array of previously unrecognized (in this coal, and arguable in most others) sub-micron minerals, some <10 nm in size. The first sample representing the 1.22–1.24 specific gravity fraction of the middle bench contains a mineral identified as a La-, Ce-, Nd-bearing monazite; other minerals with CrFe, CuFeS, FeZn-S, and Pb; and areas, probably comprising agglomerates of several grains, if not several minerals, with concentrations of Mg, Ca, Ti, Fe, Zn, Zr, and Mo. The second sample representing the 1.30–1.31 specific gravity fraction of the basal lithotype has aggregates of particles enriched in Mg, Ca, Ti, and Fe. Individual grains not specifically quantified include CrNiMnCuFeS, AgS, and CuS. Detailed investigation of one area (most of the variation within a <4 μm2 region) demonstrates the presence of greenockite (CdS); minute phases containing NiCoGe and AgCdBi, the latter with a more evident S association than the former; metallic Bi; nisnite (Ni3Sn); silver cadmium; manganosite (MnO); and siderite. Some minerals, such as the monazite, are most likely of detrital or tuffaceous origin. Many of the other assemblages could be of hydrothermal origin, a hypothesis supported by known regional geochemical and coal rank trends, but not previously demonstrated in mineral assemblages at the 10's of nm scale in this region.},
doi = {10.1016/J.COAL.2018.04.006},
journal = {International Journal of Coal Geology},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 16 00:00:00 EDT 2018},
month = {Mon Apr 16 00:00:00 EDT 2018}
}

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