Enrichment and distribution of elements in the middle Miocene coal seams in the Orhaneli coalfield (NW Turkey)

Karayi̇ǧi̇t, Ali̇ İhsan; Yerin, U. O.; Oskay, Rıza Görkem; Bulut, Yılmaz; Córdoba, Patrica

doi:10.1016/j.coal.2021.103854

Cited by 28 publications

(10 citation statements)

References 111 publications

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“…Chromium enrichment in Turkish Neogene coals is mostly related to clastic chromite grains derived from ophiolites in the basement (Karayiğit et al, , 2020a(Karayiğit et al, , 2021Palmer et al, 2004;Çelik et al, 2021). Ophiolites, like in other Turkish Neogene coalfields, are found in the Bozburun coalfield's adjacent areas (Figure 1a), and chromitites reported from these ophiloties (Uysal et al, 2007).…”

Section: Factors Controlling the Elemental Distributionmentioning

confidence: 96%

“…The organic matter contains measurable by SEM-EDX amounts of Ca and S. This data implies an organic affinity for CaO. In Turkish Neogene coals, sulphate minerals, particularly gypsum/anhydrite, are reported as minor phases due to the evaporation of porewater during storage or reactions between liberated sulphuric acid from pyrite oxidation and CaO in porewater or organic matter (Karayiğit et al, 2017a(Karayiğit et al, , 2021. In contrast, gypsum/anhydrite are lacking from XRD and are also not identify during SEM examination.…”

Section: Factors Controlling the Elemental Distributionmentioning

confidence: 97%

“…Therefore, any influence of marine and/or hypersaline water influence on the palaeomire and/or onset of geochemical coalification could be ruled out for the study area. Celestine and Sr-bearing barite have been found within cavities of syngenetic framboidal pyrite grains in Turkish Neogene coals, as well as Sr-bearing barite overgrowths around feldspars (e.g., Kangal/ Sivas and Keles and Orhaneli/Bursa) (Karayiğit et al, 2019(Karayiğit et al, , 2021Çelik et al, 2021). In these coalfields, altered tuff layers are located in the coal seams, and liberated Sr and Ba from alteration of volcanogenic minerals (e.g., Sr-/Ba-bearing feldspars) and/or airfall ash (tephra) within paleomires were reacted with sulphuric acid in the palaeomire.…”

Section: Provenance Of Mineralsmentioning

confidence: 99%

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Coal quality, mineralogy, petrography, and geochemistry of the high-strontium Parçikan lignite

Oskay

Karayi̇ǧi̇t

2022

Bull.Min.Res.Exp.

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The Parçikan coalfield hosts a late Miocene 1.1-m thick coal seam. This study aims to determine coal quality, mineralogy, petrography and geochemistry, and controlling factors of elemental enrichments. The coals are generally black and greyish black in colour, and the low part of the seam commonly includes fossil shell remains. The ash yield displays a decreasing trend towards the upper part of the seam; in turn, gross calorific and total C values increase upwards. The total S content being generally higher than 5% (on dry basis), displays an increasing trend towards the upper part. In the entire seam, huminite is the most common maceral group, while inertinite and liptinite display variable proportions. The identified minerals by XRD are mainly quartz, clay minerals, calcite, pyrite, and aragonite (in fossil shell remains-bearing samples), whereas feldspars and marcasite determined in a few samples. Furthermore, in the coal samples, celestine and barite were identified by SEM-EDX. This study indicates that precipitation of celestine and Sr-bearing barite grains during diagenetic stage and Sr-uptake by mollusc within the palaeomire caused Sr enrichment in the entire seam. Overall, the water influx and redox conditions controlled the mineralogical and the elemental compositions of the coal seam.

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Section: Factors Controlling the Elemental Distributionmentioning

confidence: 96%

Section: Factors Controlling the Elemental Distributionmentioning

confidence: 97%

Section: Provenance Of Mineralsmentioning

confidence: 99%

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Coal quality, mineralogy, petrography, and geochemistry of the high-strontium Parçikan lignite

Oskay

Karayi̇ǧi̇t

2022

Bull.Min.Res.Exp.

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“…The occurrence form and migration behavior of trace elements in coal are of great significance to not only their abnormal enrichment but also the clean utilization of coal and the recovery of beneficial elements. Therefore, in recent years, related topics have become hotspots in scientific research on coal. − Globally, the enrichment of elements in coal has attracted much attention, especially rare-earth elements and yttrium (REY). − REY have low volatility and are thus abundant in coal ash after combustion, rendering coal a potential metal source. ,− Many studies have investigated the abnormal enrichment and recovery of beneficial elements in coal . For example, in the late 1950s, countries began to strengthen the investigation of strategic mineral resources such as Ge and U, for which the identification of possible Ge and U enrichment in coal is also essential .…”

Section: Introductionmentioning

confidence: 99%

Occurrence Patterns and Enrichment Influencing Factors of Trace Elements in Paleogene Coal in the Fushun Basin, China

Zhang

Wei

Zhang

et al. 2022

ACS Earth Space Chem.

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The occurrence forms of trace elements in coal are of great significance for the clean utilization, abnormal enrichment, and recovery of beneficial elements in coal. The Fushun Basin in Northeast China has thick coal deposits which provide a good opportunity for studying their geochemistry. This study aims to estimate the element enrichment of Paleogene coal seams and their influencing factors during deposition based on statistical and geochemical analyses. Compared with world hard coals, coals in the Fushun Basin feature enrichment of Ga and Sb (CC > 5), slight enrichment of V, Cr, Co, Ni, As, Rb, Zr, Nb, and Cd (2 < CC < 5), and depletion of B, Tl, Bl, and U (CC < 0.5). The CC values of the remaining elements (0.5 < CC < 2) are close to the average values for world hard coals. The main carriers of Ga, Co, Rb, Mo, As, Se, Pb, V, and Li are potassium, iron, and sulfate minerals and those of Cd, Cr, Ni, Sb, Th, Sn, U, Hf, Zr, Cs, Ta, and Nb are clay minerals. The CIA, Sr/Cu, Rb/Sr, and Ga/Rb values suggest that the studied coal seam formed under humid/warm climatic conditions. The coal seam is mainly derived from intermediate source rocks and sandstone or mudstone source rocks which were exposed to intensive chemical weathering and deposited in a freshwater setting. Additionally, paleoweathering, paleoclimate, detrital input, and provenance all contributed to the enrichment of geochemical elements in the studied Paleogene coal. The results of this study are preliminary, and the authors will continue to conduct mineralogical analysis.

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“…These reasons have prompted global exploration for new sources of these critical elements. One promising source of many of these critical elements is coal and coal-bearing sequences [3,[9][10][11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Metalliferous Coals of Cretaceous Age: A Review

et al. 2022

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Critical elements in coal and coal-bearing sequences (e.g., Li, Sc, V, Ga, Ge, Se, Y and rare earth elements, Zr, Nb, Au, Ag, platinum group elements, Re, and U) have attracted great attention because their concentrations in some cases may be comparable to those of conventional ore deposits. The enrichment of critical elements in coals, particularly those of Carboniferous-Permian and Cenozoic ages, have generally been attributed to within-plate (plume-related) volcanism and associated hydrothermal activity. However, Cretaceous coals are not commonly rich in critical elements, with the exception of some (e.g., Ge and U) in localised areas. This paper globally reviewed metalliferous coals from Siberia, the Russian Far East, Mongolia, South America, the United States and Mexico, Canada (Alberta and British Columbia), China, Africa, and Australasia (Victoria, Queensland, New South Wales, South Australia, Northern Territory, New Zealand, Nelson, West Coast, Canterbury, Otago, and Southland). The world-class Ge-U or Ge deposits in North China, Mongolia, and Siberia are the only commercially significant representatives of the Cretaceous metalliferous coals, which are related to bio-chemical reduction of oxidized meteoric, hydrothermal, or sea waters by organic matter of the peat bogs. The common Cretaceous coals worldwide are generally not rich in critical elements because intensive igneous activity led to extensive acidification of terrestrial and marine waters, which are responsible for the low coal metallogenesis during the Cretaceous period, especially the Early Cretaceous time.

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Enrichment and distribution of elements in the middle Miocene coal seams in the Orhaneli coalfield (NW Turkey)

Cited by 28 publications

References 111 publications

Coal quality, mineralogy, petrography, and geochemistry of the high-strontium Parçikan lignite

Coal quality, mineralogy, petrography, and geochemistry of the high-strontium Parçikan lignite

Occurrence Patterns and Enrichment Influencing Factors of Trace Elements in Paleogene Coal in the Fushun Basin, China

Metalliferous Coals of Cretaceous Age: A Review

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