Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1753122 | International Journal of Coal Geology | 2014 | 26 Pages |
Abstract
Two intra-seam tonstein layers in the C3 coal were identified based on their lateral persistence, mineralogical mode of occurrence and composition, as well as their elemental composition. The tonsteins are dominated by kaolinite, with minor quartz and possibly mixed-layer illite/smectite. Both tonsteins were derived from dacitic magma. The ratios of Nb/Ta, Zr/Hf, and U/Th are much lower in tonsteins than in the adjacent coal benches, which is attributed to the hydrothermal leaching.
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Authors
Shifeng Dai, Tian Li, Vladimir V. Seredin, Colin R. Ward, James C. Hower, Yiping Zhou, Mingquan Zhang, Xiaolin Song, Weijiao Song, Cunliang Zhao,