The effects of volcanic ash on the maceral and chemical composition of the C coal bed, Emery Coal Field, Utah

Crowley, S.S.; Stanton, R.W.; Ryer, Thomas A.

doi:10.1016/0146-6380(89)90059-4

Cited by 102 publications

(52 citation statements)

References 8 publications

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“…The REE enrichment mode in the Zhongliangshan tuff is similar to that of Songzao Coalfield. Some studies have shown that L-REE are more easily to be leached by groundwater and are more apt to be adsorbed by organic matter [38][39][40][41][42].…”

Section: Origin Of Tuffmentioning

confidence: 99%

Geochemistry and Mineralogy of Tuff in Zhongliangshan Mine, Chongqing, Southwestern China

Zou

Tian

2016

Minerals

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Coal-bearing strata that host rare metal deposits are currently a hot issue in the field of coal geology. The purpose of this paper is to illustrate the mineralogy, geochemistry, and potential economic significance of rare metals in the late Permian tuff in Zhongliangshan mine, Chongqing, southwestern China. The methods applied in this study are X-ray fluorescence spectrometry (XRF), inductively coupled mass spectrometry (ICP-MS), X-ray diffraction analysis (XRD) plus Siroquant, and scanning electron microscopy in conjunction with an energy-dispersive X-ray spectrometry (SEM-EDX). The results indicate that some trace elements including Li, Be, Sc, V, Cr, Co, Ni, Cu, Zn, Ga, Zr, Nb, Cd, Sb, REE, Hf, Ta, Re, Th, and U are enriched in the tuff from Zhongliangshan mine. The minerals in the tuff mainly include kaolinite, illite, pyrite, anatase, calcite, gypsum, quartz, and traces of minerals such as zircon, florencite, jarosite, and barite. The tuff is of mafic volcanic origin with features of alkali basalt. Some minerals including florencite, gypsum, barite and a portion of anatase and zircon have been derived from hydrothermal solutions. It is suggested that Zhongliangshan tuff is a potential polymetallic ore and the recovery of these valuable elements needs to be further investigated.

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Section: Origin Of Tuffmentioning

confidence: 99%

Geochemistry and Mineralogy of Tuff in Zhongliangshan Mine, Chongqing, Southwestern China

Zou

Tian

2016

Minerals

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“…The parting samples YDZ4-4 (339.88 µg/g) and YDZ4-8 (144.76 µg/g) have relatively higher concentrations than the other samples. In general, the REY concentration in the coal bench samples underlying partings (YDZ4-4) is higher than other samples, which are probably due to leaching, as previously reported by Crowley et al [55] and Dai et al [40]. However, the REY concentration of parting (YDZ4-8) is lower than that of the underlying and overlying coal benches.…”

Section: Geochemical Characteristics Of Reymentioning

confidence: 49%

“…The L-type enrichment generally reflects a terrigenous origin [56]. The H-type enrichment is probably due to the injection of hydrothermal solutions, while the M-type is possibly related to natural waters [56] In the parting sample YDZ4-8, Ce shows a slight positive Ce anomaly (δCe = 1.08) with a low concentration of REE, which is due to groundwater leaching [40,55]. Cerium is the only rare earth element that can be oxidized to Ce 4+ and could have been precipitated in-situ, leading to high Ce and low REE concentration [51].…”

Section: Patterns Of Reymentioning

confidence: 99%

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Mineralogical and Geochemical Characteristics of Trace Elements in the Yongdingzhuang Mine, Datong Coalfield, Shanxi Province, China

et al. 2018

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Fifteen samples of No. 4 coal from the Yongdingzhuang Mine in Datong Coalfield were tested for their elemental compositions, modes of occurrence, and mineralogical compositions, using X-ray powder diffraction, X-ray fluorescence spectrometry, inductively coupled plasma mass spectrometry, and scanning electron microscopy equipped with an energy-dispersive X-ray spectrometer. The samples have low sulfur content (0.63%). The major minerals are kaolinite and quartz, followed by pyrite and anatase. Compared with averages for the Chinese coals, the percentages of SiO 2 (15.11%), TiO 2 (0.7%), and Al 2 O 3 (10.39%) are much higher. In No. 4 coals, Li (62.81 µg/g), Be (6.94 µg/g), Zr (235 µg/g), Ga (17.04 µg/g), F (165.53 µg/g), Tl (1.93 µg/g), and Hg (0.34 µg/g) are some potentially valuable and toxic trace elements with higher concentrations than Chinese coals and World hard coals. Lithium and F mainly have kaolinite associations. With the exception of kaolinite, Li, and F also partly occur in anatase, gorceixite and goyazite. Beryllium largely occurs in anatase; gallium is mainly associated with kaolinite and to a lesser extent, with gorceixite and goyazite; zirconium is associated with kaolinite, gorceixite and goyazite; and thallium and Hg occur in in pyrite. Potentially valuable elements (including Al, Li, Ga, and Zr) might be recovered as value-added byproducts from coal ash. Toxic elements (e.g., Be, F, Tl, and Hg) might have potential adverse effects to the environment and human health during coal processing. In addition, the distribution patterns of rare earth elements and yttrium (REY) indicate that the REY in No. 4 coals originated from the granite of Yinshan Oldland, and natural waters or hydrothermal solutions that may circulate in coal basins.

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“…Eskenazy (1987b) suggested that this trend is particularly strong in Pcelarovo basin vitrains overlain by Oligocene pyroclastics, and that the REE enrichment in Pcelarovo vitrain resulted from leaching of REE from the overlying pyroclastics and their preferential concentrations by organic matter. Crowley et al (1989), in a study of tonsteins in the C coal bed in Utah attributed REE enrichment in coal underlying the tonsteins to three possible factors: (1) leaching of volcanic ash by groundwater and subsequent uptake by organic matter, (2) leaching of volcanic ash by ground water and subsequent incorporation in minerals, and (3) incorporation of volcanic ash minerals in peat.…”

Section: Rare Earth Elements In the Coals And The Partingsmentioning

confidence: 99%

Rare Earth Elements (REEs) in the Late Carboniferous Coal from the Heidaigou Mine, Inner Mongolia, China

Chen

2007

Energy Exploration & Exploitation

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The effects of volcanic ash on the maceral and chemical composition of the C coal bed, Emery Coal Field, Utah

Cited by 102 publications

References 8 publications

Geochemistry and Mineralogy of Tuff in Zhongliangshan Mine, Chongqing, Southwestern China

Geochemistry and Mineralogy of Tuff in Zhongliangshan Mine, Chongqing, Southwestern China

Mineralogical and Geochemical Characteristics of Trace Elements in the Yongdingzhuang Mine, Datong Coalfield, Shanxi Province, China

Rare Earth Elements (REEs) in the Late Carboniferous Coal from the Heidaigou Mine, Inner Mongolia, China

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