Influence of environments of coal deposition on phosphorous accumulation in a high latitude, northern Alaska, coal seam

Rao, P.D.; Walsh, D. E.

doi:10.1016/s0166-5162(98)00026-3

Cited by 31 publications

(9 citation statements)

References 12 publications

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“…SEM-EDS data show that the apatite, in a few cases, contains a trace of F, and thus can be identified as fluorapatite. Other studies indicate that the apatite in coal mostly occurs as cell-fillings in structured macerals, and thus represents material syngenetically precipitated in the peat bed (e.g., Ward et al, 1996;Rao and Walsh, 1999;Dai et al, 2015d). The phosphorus precipitated in this way may have been released from decay of the peat-forming plant tissues, or possibly from contemporaneously input of volcanic material.…”

Section: Modes Of Occurrence Of Minerals In Coalmentioning

confidence: 99%

Enrichment of U-Re-V-Cr-Se and rare earth elements in the Late Permian coals of the Moxinpo Coalfield, Chongqing, China: Genetic implications from geochemical and mineralogical data

Dai

Xie

Jia

et al. 2017

Ore Geology Reviews

203

135

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Section: Modes Of Occurrence Of Minerals In Coalmentioning

confidence: 99%

Enrichment of U-Re-V-Cr-Se and rare earth elements in the Late Permian coals of the Moxinpo Coalfield, Chongqing, China: Genetic implications from geochemical and mineralogical data

Dai

Xie

Jia

et al. 2017

Ore Geology Reviews

203

135

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“…In contrast, crandallite and foggite have been found in sedimentary environments with physicochemical characteristics comparable to those of the sewer network. Thus, crandallite occurs in coal seams (Ward et al 1996;Rao and Walsh 1999), in lateritic wheathering profiles in which it is formed from the alteration of clay minerals in presence of apatite (Vieillard et al 1979), or as a secondary precipitate in the presence Al-hydroxides (Schwab et al 1989).…”

Section: Spatial and Temporal Evolution Of Phosphate Species In The Smentioning

confidence: 99%

Phosphate dynamics in an urban sewer: A case study of Nancy, France

et al. 2009

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The nature of phosphate phases present in suspended matter, biofilm, and sediment of Greater Nancy sewer system was investigated over a period of two years. The phosphate speciation was determined by two approaches: a direct identification of phosphorus mineral phases was conducted by Transmission Electron Microscopy (TEM) coupled with energy-dispersive X-ray spectroscopy (EDXS), whereas a chemical extraction of samples provided an estimate of phosphorus pools defined by the fractionation scheme. Quantitative analysis of 1340 individual particles by TEM-EDXS allowed to draw a picture of phosphate species distributions along the sewer system and over time. Amorphous Ca-phosphates (brushite, whitlockite, octacalcium phosphate, Mg-brushite, hydroxyapatite and carbapatite) were ubiquitous although brushite dominated upstream, and octacalcium phosphate and apatite prevailed downstream and in sediments. Al-Ca-phosphate minerals such as foggite, bearthite, gatumbaite, and crandallite appeared downstream and in biofilms. Ca-phosphate phase assemblages in the different locations of the sewer system were dependent on phase transformations from brushite to hydroxyapatite that were shown to be kinetically driven. The restriction of Al-Ca-phosphates to downstream of the sewer system was most probably related to the lower pHs measured at these sites. The pH dependency was confirmed by stability calculations. Chemical extractions were not reliable. TEM examination of extraction residues revealed the presence of neoformed Al-Ca-phosphate species that invalidated the fractionation scheme. Nonetheless, it confirmed that phosphate phases may undergo significant geochemical changes over a short time scale.

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“…In addition, only traces of detrital calcites (Figure 5(a)) were found in the samples. Detrital calcites in coal usually indicate an alkaline environment (Rao and Walsh, 1999; Wang et al., 2016a). Given that calcite can be easily dissolved in an acidic environment, the formation of authigenic kaolinite is favored, which is consistent with the abundant kaolinite in the No.…”

Section: Discussionmentioning

confidence: 99%

Geochemical characteristics of No. 6 coal from Nanyangpo Mine, Datong coalfield, north China: Emphasis on the influence of hydrothermal solutions

Liu

Zhang

et al. 2020

Energy Exploration & Exploitation

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This paper discusses the volcanic influence on the mineralogical and elemental geochemistry of No. 6 coal from Nanyangpo Mine in the Datong coalfield, north China. Sixteen samples (14 coal and 2 partings) were analyzed by different geochemical methods. The results revealed that the No. 6 coal is a medium–high volatility, highly calorific, bituminous coal with a low-ash and medium-sulfur content. The minerals mainly consisted of kaolinite, calcite, dolomite, and pyrite. In addition, traces of apatite, sphalerite, and anatase were also found. Calcite, dolomite, and pyrite in the coal samples were mainly derived from epigenetic hydrothermal solutions, whereas kaolinite and apatite originated from volcanic ash. Harmful trace elements including Pb, Cu, Mo, Tl, and Hg in the No. 6 coal samples were higher than those of common global coals. These harmful elements mainly occurred in sulfide minerals, which were probably influenced by hydrothermal inputs.

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Influence of environments of coal deposition on phosphorous accumulation in a high latitude, northern Alaska, coal seam

Cited by 31 publications

References 12 publications

Enrichment of U-Re-V-Cr-Se and rare earth elements in the Late Permian coals of the Moxinpo Coalfield, Chongqing, China: Genetic implications from geochemical and mineralogical data

Enrichment of U-Re-V-Cr-Se and rare earth elements in the Late Permian coals of the Moxinpo Coalfield, Chongqing, China: Genetic implications from geochemical and mineralogical data

Phosphate dynamics in an urban sewer: A case study of Nancy, France

Geochemical characteristics of No. 6 coal from Nanyangpo Mine, Datong coalfield, north China: Emphasis on the influence of hydrothermal solutions

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