Trace element abundances in major minerals of Late Permian coals from southwestern Guizhou province, China

Zhang, Junying; Ren, Dongdong; Chen, Zheng; Zeng, Rongshu; Chou, Chen‐Lin; Liu, Jing

doi:10.1016/s0166-5162(02)00164-7

Cited by 125 publications

(63 citation statements)

References 6 publications

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“…With respect to the Chinese coals, uranium is associated with: (1) organic matter [30,34,36,39,42,[77][78][79][80][81][82][83], (2) as physical adsorption by pores and pelitic components [46,84], (3) silicates [34,36,37,47,65,66,77,82,[85][86][87][88][89][90][91][92][93], (4) phosphate minerals [94][95][96], (5) uranium minerals [30,34,45], and (6) mixed affinity to both organic and inorganic matter [19,35,97]. Overall, the modes of occurrence of uranium in Chinese coals was deduced indirectly, i.e., correlation with ash yield and major element oxide, and sequential chemical extraction, with only a few from direct evidences of SEM-EDS (Scanning electron microscope combined with an X-ray energy dispersive spectrometer) identification.…”

Section: Modes Of Occurrence Of Uranium In Chinese Coalsmentioning

confidence: 99%

Abundance, Distribution, and Modes of Occurrence of Uranium in Chinese Coals

Chen

Yao

et al. 2017

Minerals

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Due to its environmental and resource impacts, the geochemistry of uranium in coal is of both academic and practical significance. In order to give a comprehensive summary about the geochemistry of uranium in coals, the abundance, distribution, and modes of occurrence of uranium in Chinese coals were reviewed in this paper. Although some coals from southwestern and northwestern China are significantly enriched in uranium, the common Chinese coals are of a comparable uranium concentration to the world coals. The roof and floor rocks, and parting of coalbeds, or coal benches that are close to the surrounding rock are favorable hosts for uranium in one coalbed. The uranium concentrations in coals of different ages decrease in this order, e.g., Paleogene and Neogene > Late Permian > Late Triassic > Late Carboniferous and Early Permian > Late Jurassic and Early Cretaceous > Early and Middle Jurassic. Uranium in Chinese coals is mainly associated with organic matter, and is correspondingly enriched in subbituminous coal and lignite.

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Section: Modes Of Occurrence Of Uranium In Chinese Coalsmentioning

confidence: 99%

Abundance, Distribution, and Modes of Occurrence of Uranium in Chinese Coals

Chen

Yao

et al. 2017

Minerals

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“…The confident level of mercury occurrence in coal was estimated 6 out of 10 (Finkelman 1994). It is generally considered that mercury can be presented in coal as sulfide and selenides, in forms associated with pyrite and marcasite (Ward et al 1999;Hower et al 2008;Kolker 2012), calcite and chlorite (Zhang et al 2002), selenio-galena (Dai et al 2006b(Dai et al , 2015, clausthalite (Hower and Robertson 2003), kleinite and cinnabar (Brownfield et al 2005), sphalerite (HgFeS 2 ) and getchellite (Dai et al 2006a). It can also organically bounded to organic matter (HgOM) (Rumayor et al 2015), or even as HgS and metallic mercury (Hg 0 ) (Finkelman 1994;Yudovich and Ketris 2005).…”

Section: Introductionmentioning

confidence: 99%

The distribution and occurrence of mercury in Chinese coals

Bai

Wang

et al. 2017

Int J Coal Sci Technol

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Mercury is one of the most concerned hazardous elements in coals. 1018 coal samples of different coal-forming periods, coal-accumulating areas and coal ranks all over the country were collected to study the distributions of mercury in Chinese coals. The modes of occurrence of mercury were studied with float-sink experiments of 10 coals from different basins in China and correlation analyses were conducted between concentrations of mercury and maceral and sulfur contents, as well as the ash yield. The theoretic concentrations and affinities of mercury in vitrinite, inertinite, clay and pyrite were then calculated following the methods proposed by Solari. The weighted average concentration of mercury in Chinese coals is 0.154 lg/g, which is similar to that in the word coals in general. The mercury concentrations vary largely in the coals of different coal-forming period and coal-accumulating areas as geological settings play key roles in determining the geochemistry of mercury. The concentrations of mercury in coals from south and southwest China and those from North China of C 3 -P 1 are relatively higher while those from North China of J 1-2 and Northeast of J 3 -K 1 relatively lower. The general distribution trends of mercury are very similar to that of ash yield, sulfur contents in coals. Pyrite is the dominant carrier of mercury in most coals, especially in some high-sulfur coals with abundant epigenetic pyrite formed during diagenesis and metamorphism. Mercury has higher affinity to vitrinite than to inertinite in most coals, which accords with the geological origin of macerals and geochemistry of mercury.

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“…Meanwhile, sample SS-1C is enriched in As, Se, and Hg. According to previous research [48][49][50][51], some trace elements, for instance, arsenic and mercury, are concentrated in the late stage of hydrothermal fluids. In some cases, arsenic was syngenetically derived from hydrothermal solutions [6].…”

Section: Hydrothermal Fluid Influencesmentioning

confidence: 98%

Geological Controls on Mineralogy and Geochemistry of an Early Permian Coal from the Songshao Mine, Yunnan Province, Southwestern China

Wang

2016

Minerals

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This paper discusses the content, distribution, modes of occurrence, and enrichment mechanism of mineral matter and trace elements of an Early Permian coal from Songshao (Yunnan Province, China) by means of coal-petrological, mineralogical, and geochemical techniques. The results show that the Songshao coal is characterized by high total and organic sulfur contents (3.61% and 3.87%, respectively). Lithium (170.39 µg/g) and Zr (184.55 µg/g) are significantly enriched in the Songshao coal, and, to a lesser extent, elements such as Hg, La, Ce, Nd, Th, Sr, Nb, Sn, Hf, V, and Cr are also enriched. In addition to Hg and Se that are enriched in the roof and floor strata of the coal seam, Li, La, Ce, Pr, Nd, Sm, Gd, Y, Cd, and Sb are slightly enriched in these host rocks. Compared to the upper continental crust, rare earth elements and yttrium in the host rocks and coal samples are characterized by a light-REE enrichment type and have negative Eu, positive Ce and Gd anomalies. Major minerals in the samples of coal, roof, and floor are boehmite, clay minerals (kaolinite, illite, and mixed layer illite-smectite), pyrite, and anatase. Geochemical and mineralogical anomalies of the Songshao coal are attributed to hydrothermal fluids, seawater, and sediment-source rocks.

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Trace element abundances in major minerals of Late Permian coals from southwestern Guizhou province, China

Cited by 125 publications

References 6 publications

Abundance, Distribution, and Modes of Occurrence of Uranium in Chinese Coals

Abundance, Distribution, and Modes of Occurrence of Uranium in Chinese Coals

The distribution and occurrence of mercury in Chinese coals

Geological Controls on Mineralogy and Geochemistry of an Early Permian Coal from the Songshao Mine, Yunnan Province, Southwestern China

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