Quality variations in the high-sulphur lignite of the Neogene Beypazari Basin, Central Anatolia, Turkey

Whateley, M. K. G.; Tuncali, E.

doi:10.1016/0166-5162(94)00023-s

Cited by 32 publications

(16 citation statements)

References 4 publications

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“…Moreover, sulphur enrichment by Triassic and Early Jurassic sulphate recycling has been reported by Querol et al (1996) for the Mesozoic and Tertiary coal deposits in Mediterranean region where high sulphur contents were related to alkaline depositional environments developed in basins generated during the Alpine Cylce in Circum-Mediterranean mobile belts. A volcanic source (Whateley and Tuncalı, 1995) for the sulphur has also been proposed.…”

Section: Characterization Of Coals With Traditional Coal Parametersmentioning

confidence: 99%

Geochemistry of trace elements in Çan coal (Miocene), Çanakkale, Turkey

Gürdal

2008

International Journal of Coal Geology

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Section: Characterization Of Coals With Traditional Coal Parametersmentioning

confidence: 99%

Geochemistry of trace elements in Çan coal (Miocene), Çanakkale, Turkey

Gürdal

2008

International Journal of Coal Geology

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“…In general, medium and high sulfur contents are attributed to the influence of seawater during peat accumulation, and therefore seawater sulfate may be the primary source of sulfur in coal (Casagrande et al, 1980;Cohen et al, 1984;Given and Miller, 1985;Chou, 2012). On the other hand, high sulfur contents in coal deposited in the freshwater environment without seawater influence (e.g., Whateley and Tuncalı, 1995;Karayiğit et al, 2001;Gürdal and Bozcu, 2011) could be a consequence of neutral or weakly alkaline conditions induced by a calcium-rich environment . In the case of the studied samples, we did not find any data concerning the marine influence in the coal zones.…”

Section: Coal Rank and Petrographic Compositionmentioning

confidence: 99%

Petrography and palynology of Late Oligocene and Middle Miocene coals in the Gelibolu peninsula, NW Turkey

Demirtaş¹,

Bozcu²,

Koşun³

et al. 2015

Turkish J Earth Sci

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However, all of them have focused on the geology of the coal-bearing strata and there is no study regarding the coal petrographic and palynological properties of these coals.The aim of this paper is to determine the maceral and palynological composition of the two different coal-bearing formations, which are the Late Oligocene Osmancık and Middle Miocene Gazhanedere (Figures 1 and 2). We also aim to determine the depositional conditions of the coals using coal petrography, including maceral ratios, by the contribution of sedimentological, palynological, and paleontological evidence.Petrographic indices and diagrams, using maceral ratios, were widely applied to the coal samples in order to determine the depositional conditions of peat accumulation (e.g.

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“…The basin fill sequence has been summarised by Whateley and Tuncalı (1995). The initial basin fill material consisted of coarse-grained clastic and volcanoclastic material.…”

Section: Geologymentioning

confidence: 99%

“…The lower seam (Tb) is generally dull with bright bands. The lignite petrography and mineral matter have been described in detail elsewhere (Whateley and Tuncalı, 1995).…”

Section: The Study Area Characteristics Of the Lignite And The Datamentioning

confidence: 99%

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Geostatistical Conditional Simulation for the Assessment of the Quality Characteristics of Cayırhan Lignite Deposits

Ersoy

Yünsel

2006

Energy Exploration & Exploitation

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Traditional estimation techniques based on block models with interpolation such as inverse distance and kriging methods do not take into account the uncertainty associated with the estimates and variability of a deposit. These methods are also inadequate for short range mine planning. However, conditional simulation models (Sequential Gaussian Simulation) reproduce the actual variability (histogram) and spatial continuity (variogram) of the attributes of interest. Sequential Gaussian Simulation (SGS) method was used to address the problem of measuring the uncertainty associated with an estimate for Çayırhan coal deposits. The coal seam is split by a 0.5-1 m thick tuffaceous siltstone and claystone into the upper (Tv), and lower (Tb) seams, which contain essentially different mineral matter and quality parameters. Directional and omni-directional experimental semivariograms of the variables for the transformed data showed that neither geometric nor zonal anisotropy exist in the data. The most evident spatial dependence structure of the continuity for omnidirectional experimental variogram, characterised by spherical and experimental models of the quality variables were obtained. The case study addresses the spatial distribution and uncertainty of quality variables at the study area using a probabilistic approach. This approach was based on SGS used to yield a series of conditionally images characterised by equally probable spatial distributions of the quality variables across the area. The advantages of SGS were illustrated through the case study. The simulated models can be incorporated into mine planning and scheduling.

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Quality variations in the high-sulphur lignite of the Neogene Beypazari Basin, Central Anatolia, Turkey

Cited by 32 publications

References 4 publications

Geochemistry of trace elements in Çan coal (Miocene), Çanakkale, Turkey

Geochemistry of trace elements in Çan coal (Miocene), Çanakkale, Turkey

Petrography and palynology of Late Oligocene and Middle Miocene coals in the Gelibolu peninsula, NW Turkey

Geostatistical Conditional Simulation for the Assessment of the Quality Characteristics of Cayırhan Lignite Deposits

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