Variations in elemental and mineralogical compositions of Late Oligocene, Early and Middle Miocene coal seams in the Kale-Tavas Molasse sub-basin, SW Turkey

Karayi̇ǧi̇t, Ali̇ İhsan; Atalay, Mustafa; Oskay, Rıza Görkem; Córdoba, Patricia; Querol, Xavier; Bulut, Yılmaz

doi:10.1016/j.coal.2019.103366

Cited by 32 publications

(29 citation statements)

References 102 publications

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“…There is a REY-Se-Pb-Mo-U-enrichment horizon (Horizon I) immediately overlying the sandstone throughout the outcrop section (Figure 9). In Horizon I, the REY, Se, Pb, Mo, and U contents are up to 1013, 38, 123, 72, and 81 µg/g, respectively; the REY negatively correlates with ash yield (r = −0.99) and show essentially no correlations with Al 2 O 3 (Figure 9), P 2 O 5 , and Zr, thereby appearing to indicate an organic association; this result differs from previous studies showing that the REY in some REY-rich coals is mostly likely hosted by phosphates, heavy minerals, and clay minerals [5,7,56]. Moreover, Horizon I is characterized by a high degree of REY enrichment and normal levels of Zr, Hf, Nb, and Ta, appearing to exclude the possibility of the input of alkaline volcanic ash due to them being enriched in the REY-Zr (Hf)-Nb (Ta) assemblage [5,7,[60][61][62][63][64].…”

Section: Origin Of Highly Elevated Concentrations Of the Rey-se-pb-mo...contrasting

confidence: 93%

“…Additionally, the detrital materials in the Xian'an Coalfield are possibly derived from the weathering residues (immediately above the Maokou Formation limestone) within the coastal zone, which were transported into the peat mire by seawater during the formation of the coal-bearing stratum. In this case, detrital calcite and dolomite grains are generally associated with the clay matrices [56]. However, the carbonate mineral phases cannot be identified in the coals by the XRD and SEM-EDS analysis, indicating a negligible detrital input from the adjacent weathering crust directly above the Maokou Formation limestone.…”

Section: Source Of Detrital Materialsmentioning

confidence: 98%

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Geological Controls on Enrichment of Rare Earth Elements and Yttrium (REY) in Late Permian Coals and Non-Coal Rocks in the Xian’an Coalfield, Guangxi Province

Zhang

Zhuang

et al. 2021

Minerals

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The highly elevated concentrations of the rare earth elements and yttrium (REY), U, Mo, Se, and Pb in late Permian coals in some coalfields in Guangxi Province, South China, have been widely investigated; however, the mode of occurrence and enrichment mechanism of these critical elements are still under debate. This study investigates the mineralogical and geochemical compositions of coals and non-coal rocks from the Xian’an Coalfield in Guangxi Province to discuss the geological factors influencing the distribution of critical elements. The mineral in the studied coals consists mainly of quartz, and to a lesser extent, muscovite and kaolinite, with a trace amount of anatase. The coals are significantly enriched in REY, Pb, Se, Mo, and U and display the REY–U–Se–Mo–Pb-enrichment horizon (Horizon I) and U–Mo-enrichment horizon (Horizon II) adjacent to the host rocks or partings. The REY, U, Se, and Pb show organic association while Mo is primarily hosted by Fe-sulfides within Horizon I. The U and Mo have a phosphate affinity within Horizon II. Both the input of pyroclastic and epiclastic materials and the leaching of acidic solutions jointly govern the distribution of the REY–U–Se–Mo–Pb-enrichment horizon (Horizon I) and the U–Mo-enrichment horizon (Horizon II). The concentrations of REY in Horizon I exceed the cutoff grade of REY, and, therefore, the coals in the Horizon I can be regarded as promising raw materials of REY.

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Section: Origin Of Highly Elevated Concentrations Of the Rey-se-pb-mo...contrasting

confidence: 93%

Section: Source Of Detrital Materialsmentioning

confidence: 98%

Geological Controls on Enrichment of Rare Earth Elements and Yttrium (REY) in Late Permian Coals and Non-Coal Rocks in the Xian’an Coalfield, Guangxi Province

Zhang

Zhuang

et al. 2021

Minerals

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“…Mixed organic/inorganic affinity (Beaton et al, 1991;Querol et al, 1997a;Sutcu, Karayiğit, 2015) or predominant inorganic affinity of Fe (Gluskoter et al, 1977;Querol et al, 1997bQuerol et al, , 2001aLiu et al, 2001;Zhao et al, 2017Zhao et al, , 2020Životić et al, 2019;Karayiğit et al, 2020) are much more readily reported. The research of Querol et al (2001b) on the mode of occurrence of selected elements in coal indicates organic affinity of only ~5-12% of iron.…”

Section: Resultsmentioning

confidence: 99%

“…Numerous authors relate Fe in coal solely to the presence of pyrite (Dill, Wehner, 1999;Ward et al, 1999;Karayiğit et al, 2000a, b;Querol et al, 2001a;Widodo et al, 2010). Iron-rich calcite and dolomite, together with siderite (Kortenski, 1992;Ward, 1992;Bai et al, 2015) or oxides (Životić et al, 2019;Karayiğit et al, 2020), however, can also be recognized as major Fe-bearing minerals in some coals. In addition, contact metamorphism and/or circulation of hydrothermal fluids within the coal seams might also result in increased iron concentrations in coal (Dai et al, 2007;.…”

Section: Resultsmentioning

confidence: 99%

Factors controlling the occurrence and distribution of iron in Bulgarian coals

Zdravkov¹

2020

Rev. Bulg. Geol. Soc.

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Coal of varying age (Upper Carboniferous to Pliocene) and coalification rank (lignite to anthracite) from nineteen coal-bearing basins and deposits, belonging to 8 coal-bearing provinces from Bulgaria, were examined for the occurrence and distribution of Fe. For the majority of the coals, the average Fe concentrations vary from 1.1 to 10.2 wt% and are higher than the World’s average. An exception exists only for Karlovo and Dobrudzha Basins, where slight depletion of Fe (<1 wt%) was established. On contrary, carbonaceous shales from the majority of the basins show Fe depletion in comparison to the Clarke values for clays. Based on the negative correlations with the ash yields, organic affinity of the element can be suggested for most of the studied coals. An exception exists for the Burgas Basin, for which predominantly inorganic affinity of the element can be suggested, whereas for Stanyantsi, Samokov, Bobov Dol, Dobrudzha and Svoge Basins mixed organic/inorganic affinity of Fe can be presumed. The element most probably predominantly occurs in the form of organometallic compounds, especially in the coals that formed in preferentially acidic peat-forming environment. Nevertheless, small contribution from biogenic iron cannot be excluded. The mineral form of Fe is probably mainly associated with sulfides, carbonates, and sulfates, although the presence of Fe oxides, silicates and hydroxides is also established. The analysis of Fe occurrence and its organic/inorganic affinity in Bulgarian coals reveal the following controlling factors: i) Fe concentration within the basin’s provenance; ii) the type (i.e. terrigenous or groundwater) of element supply; and iii) environmental conditions during peat-formation.

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“… 23 The Late Permian coal in the Southeastern Chongqing Coalfield and the Fusui Coalfield in Guangxi are the specific regions with Li enrichment. 24 − 26 Lithium is always considered to be hosted by micas and clays in sedimentary rocks 19 − 21 and partially associated with organic matter. 27 Finkelman et al concluded that 90% Li is associated with the clays and micas in high-rank coals, while the remainder is associated with the organics.…”

Section: Introductionmentioning

confidence: 99%

Geochemical and Mineralogical Characteristics of the Li–Sr-Enriched Coal in the Wenjiaba Mine, Guizhou, SW China

Ning

Qiao

et al. 2021

ACS Omega

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This paper reports the mineralogical and geochemical compositions of C6 coal in the Late Permian Longtan Formation of the Wenjiaba Mine, Northern Guizhou in southwest (SW) China. The geochemical and mineralogical studies are the basis for the potential recovery of critical metals. The Longtan Formation, which is one of the major coal-bearing strata in SW China, contains dozens of coal seams. C6 coal is the main mineable coal seam in the Wenjiaba Mine and the whole coalfield. Proximate and ultimate analyses, inductively coupled plasma mass spectrometry (ICP-MS) and X-ray fluorescence (XRF) spectrometry on trace and major element concentrations, and X-ray diffraction and SEM-EDS analyses were carried out. Results suggest that this anthracite coal is characterized by low ash yield and medium sulfur content. The minerals are mainly composed of clay minerals (kaolinite, chlorite, illite, and mixed-layer illite/smectite), pyrite, and carbonates. Lithium is significantly enriched in C6 coal, with an average of 124 μg/g, and it has a higher concentration in the lower portion of the coal seam than that in the upper one. Strontium is significantly enriched in samples WJB-05 and WJB-06, with concentrations of 3030 and 4580 μg/g, respectively, but it is normal or just slightly enriched in other benches of C6 coal. Additionally, Cu, Nb, and Ta are slightly enriched in the coal. Lithium, dominantly hosted by kaolinite in C6 coals, has a recovery potential. Celestine is one of the major Sr-bearing minerals in C6 coal.

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Variations in elemental and mineralogical compositions of Late Oligocene, Early and Middle Miocene coal seams in the Kale-Tavas Molasse sub-basin, SW Turkey

Cited by 32 publications

References 102 publications

Geological Controls on Enrichment of Rare Earth Elements and Yttrium (REY) in Late Permian Coals and Non-Coal Rocks in the Xian’an Coalfield, Guangxi Province

Geological Controls on Enrichment of Rare Earth Elements and Yttrium (REY) in Late Permian Coals and Non-Coal Rocks in the Xian’an Coalfield, Guangxi Province

Factors controlling the occurrence and distribution of iron in Bulgarian coals

Geochemical and Mineralogical Characteristics of the Li–Sr-Enriched Coal in the Wenjiaba Mine, Guizhou, SW China

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