Geochemistry and mineralogy of Late Carboniferous coal (No. 8) from the Jialequan Mine, Xishan Coalfield, Shanxi Provinc
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ORIGINAL PAPER
Geochemistry and mineralogy of Late Carboniferous coal (No. 8) from the Jialequan Mine, Xishan Coalfield, Shanxi Province, China: evidences for the geologic controls of trace elements Xiao Li 1,2 & Jian Kang 1,3 & Peipei Wang 1,3 & Yingjie Liu 1,3 & Qirui Fu 1,3 Received: 12 August 2020 / Accepted: 26 October 2020 # Saudi Society for Geosciences 2020
Abstract Xishan Coalfield is a vital coking coal production base in Shanxi Province of China. This study describes the geochemical, mineralogical, and carbon isotope values of two host rocks and ten coal benches of the Late Carboniferous (No. 8) coal of the Jialequan Mine from Xishan Coalfield. The coals are medium-ash coal (22.42%) and are of bituminous B rank (1.16–1.26%, Ro,ran). Minerals in the No.8 coal are dominated by clay minerals and calcite, along with quartz, pyrite, and anatase. The clay assemblages include kaolinite, illite, and mixed-layer I/S. Sulfate minerals, including bassanite, anhydrite, and jarosite, are identified in several coal benches. The No.8 coal is enriched in Li, Zr, Nb, Hf, Ta, Pb, Th, and U in comparison with world hard coals. Lithium is largely distributed in kaolinite and illite. Zirconium, Hf, Nb, Ta, and Th are related with clay minerals (kaolinite) or anatase if present. Lead dominantly occurs in sulfide minerals, including pyrite/marcasite or water-bearing Feoxysulfates, and to a lesser extent in galena. Uranium has an affinity with the carbonate minerals. The ratios of Sr/Ba and redoxsensitive elements indicate an oxic-dysoxic seawater environment during the coal deposition. REY in No.8 coal are related with clay minerals and phosphates minerals, and are derived from the terrigenous input (moyite of the Yinshan Upland), seawater influence, and HREY-rich hydrothermal injection in coal basins. Keywords Xishan Coalfield . Geochemistry . Minerals . Lithium
Introduction Trace elements in coal have always been a research focus through the coal exploration, mining, and utilization. The information of elemental geochemistry can not only explore many geological problems in coal formation and evolution, but also provide basic geological evidence on the genesis of coal seams (Ren et al. 2006; Swaine and Goodarzi 1995). Responsible Editor: Santanu Banerjee * Jian Kang [email protected] 1
Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang 050031, China
2
Teaching center of Experiment and Practice, Hebei GEO University, Shijiazhuang 050031, China
3
College of Earth Sciences, Hebei Geo University, Shijiazhuang 050031, China
With the increasing emphasis on environmental issues, amounts of studies have attracted much attention on the enrichment, occurrence, migration, and transformation of trace elements during coal mining and exploitation (Dai et al. 2012b, 2017; Tian et al. 2013), the research results can supply some useful knowledge for the invasion mechanisms of the environment (atmosphere, water, soil, and biosphere). Some trace elements in coal (e.g., Ge, Ga, Li, and
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