Organic Geochemistry and Depositional Environment of the Oltu Gemstone (Coal) in the Erzurum Area, NE Anatolia, Turkey

Kara-Gülbay, Reyhan; Korkmaz, Sadettin; Yaylalı-Abanuz, Gülten; Erdoğan, M. S.

doi:10.1021/acs.energyfuels.7b03486

Cited by 4 publications

(6 citation statements)

References 32 publications

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“…The cell abundance was positively correlated with porosity, which was related to the coal rank . The proportions of elements and proximate analysis results typically vary for coals of different ranks, as do the related parameters. , The main factors that influence these variations are the depositional environment and coal formation periods, which were closely related to the coal rank . Based on the results presented in this paper, the depositional environment may mainly affect the coal ranks of the studied Permian coals.…”

Section: Discussionmentioning

confidence: 60%

“…15,16 The main factors that influence these variations are the depositional environment and coal formation periods, which were closely related to the coal rank. 29 Based on the results presented in this paper, the depositional environment may mainly affect the coal ranks of the studied Permian coals. Some parameters of coal beds with different ranks are also related to the microbial community.…”

Section: Discussionmentioning

confidence: 85%

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Variations in Microbiota Communities with the Ranks of Coals from Three Permian Mining Areas

et al. 2019

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Microorganisms play vital roles in the biogeochemical processes, such as biomethane production, which is an important source of coal bed methane (CBM), that occur in coal beds. However, little information is available regarding the microbial communities in in situ coal beds of different ranks from Permian mining areas. In this study, anaerobic Biolog ECO microplates were used to determine the microbial metabolic activity, and high-throughput sequencing was used to investigate the bacteria and archaea communities in three typical mining areas. Anaerobic Biolog ECO microplates showed that the peak value of average well color development (AWCD) in low-rank coal seams from Anhui Province (A-L) was 0.46 higher than that of medium-rank coal from Shanxi Province (S-M). Phylogenetic analysis indicated that the bacterial phyla Proteobacteria, Firmicutes, and Actinobacteria were the predominant lineages in all samples, in particular, the family Oxalobacteraceae accounted for the overwhelming majority of the bacterial sequences (from 47.20 to 92.67%). Most of the identified genera, Herbaspirillum, Pseudomonas, and Acinetobacter, were fermentative bacteria that can convert coal macromolecules into methanol, acetic acid, and CO2. In addition, the archaea in A-L were dominated by the phyla Euryarchaeota, Thaumarchaeota, and Woesearchaeota. Additionally, Euryarchaeota was the dominant archaeal lineage in S-M, and Thaumarchaeota was predominant in the Guizhou Province group of high-rank coals (G-H). Canonical correspondence analysis (CCA) showed that there were significant correlations between the microbial community and porosity, hydrogen content, and oxygen content (p < 0.05). The KEGG pathway analysis indicated that biomethane production mainly depended on archaea and that the methane metabolism capacity of A-L coals was the highest. Overall, the results suggest that the diversities of the microbial communities were related to the porosity and chemical elements of the different ranks of coal.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 85%

Variations in Microbiota Communities with the Ranks of Coals from Three Permian Mining Areas

et al. 2019

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“…Oltu-stone is a semi-precious stone found in the Oltu region, of Erzurum, Turkey. In the literature, it is referred to as Erzurum Stone, black amber, gagat, Jayet, and Jet (Ethem, 1990;Kalkan et al, 2012;Kara-Gülbay et al, 2018). In Turkish, it is also known as Kara Kehribar, and Sengi Musa.…”

Section: Introductionmentioning

confidence: 99%

“…When exposed to air, it begins to harden. As a result, it is easy to carve (Hatipoğlu et al, 2012;Kara-Gülbay et al, 2018;Toprak, 2013). Based on the study of Lahn (1939), only particular deposits in the Oltu district were known as Oltu-stone formation due to resin-rich content, while others were classified as coal formation due to resin-poor content.…”

Section: Introductionmentioning

confidence: 99%

“…Jet has organic fossil-origin characteristics similar to Oltu-stone but differs in chemical properties (Hunter et al, 1993;Smith, 2005). Oltu-stone was found to be impregnated with clay and resin components and macroscopically generated from the fossilization of tree trunks (Kara-Gülbay et al, 2018). After the latest research on the genesis of Oltu-stone, it was determined to be liptinite-rich coal (Toprak, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Conversion of cleaned Oltu-stone wastes (a semi-precious stone) into a valuable product using binderless agglomeration

Bawani¹,

Arol²,

Tozsin³

et al. 2023

Physicochem. Probl. Miner. Process.

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Oltu-stone, a semi-precious stone found in Erzurum's Oltu area, is commonly utilized in the creation of decorative ornaments. More than 90% of the Oltu-stone mined is classified as Oltu-stone waste, consisting of poor Oltu-stone due to mineral impurities and small fragment sizes (OW). This waste is thrown or burnt, resulting in financial losses. Such losses might be reduced by using Oltu-stone waste (OW) instead of standard Oltu-stone (SO). The purpose of this study was to convert Oltu-stone waste into a useful pressed product. It was cleaned using the float-sink method with a density of 1.25 g.cm-3 and then utilized for binderless high-pressure agglomeration to create pressed Oltu-stone. The physical, mechanical, microscopic, and spectroscopic characteristics of the material were investigated. The bulk density of pressed Oltu-stone was reported to be 1.22-1.26 g.cm-3. However, with the same pressing time, indirect tensile strength was identical and varied when the pressing time was changed. The surface morphology of the crushed Oltu-stone revealed that it was more intact and had a less porous structure. Oltu-stone includes a lot of volatile matter and aliphatic carbon structures because of its high liptinite content. An FTIR investigation revealed that altering the pressing time affects the chemical structure but not the pressure. This effect was seen in molecules containing oxygen, namely conjugated carbonyl and carboxylic groups. It was discovered that pressed Oltu-stone has nearly identical properties to standard Oltu-stone and could be produced on a large scale commercially.

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Provenance groups in a Roman jet jewelry collection at Aquincum (Budapest, Hungary) and comparison with jet and jet-like gemstones

Demény,

Bondár,

Karlik

et al. 2024

Journal of Archaeological Science: Reports

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Organic Geochemistry and Depositional Environment of the Oltu Gemstone (Coal) in the Erzurum Area, NE Anatolia, Turkey

Cited by 4 publications

References 32 publications

Variations in Microbiota Communities with the Ranks of Coals from Three Permian Mining Areas

Variations in Microbiota Communities with the Ranks of Coals from Three Permian Mining Areas

Conversion of cleaned Oltu-stone wastes (a semi-precious stone) into a valuable product using binderless agglomeration

Provenance groups in a Roman jet jewelry collection at Aquincum (Budapest, Hungary) and comparison with jet and jet-like gemstones

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