Could hot fluids be the cause of natural pyrolysis at the ragged edge of Herrin coal, Millport 7 ½’ quadrangle, Hopkins County, Kentucky?

Valentim, Bruno; Couto, Helena; French, David; Golding, Suzanne D.; Guimarães, Fernanda; Guedes, Alexandra; O’Keefe, Jennifer M.K.; Raymond, Anne; Santos, Ana Cláudia; Valian, Alireza; Ward, Colin R.; Hower, James C.

doi:10.1016/j.coal.2020.103603

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…These infillings are mostly calcite with detectable Mg and pure dolomite (Figure 10c-f), and, to lesser extent, Fe-rich dolomite with measureable Mn (Figures 10ef) and ankerite (Figures 9f and 10c). Such carbonate mineral-infillings are commonly reported in Permo-Carboniferous coals and mostly originate from the precipitation of Ca-rich hydrothermal solutions (Dawson et al, 2012;Permana et al, 2013;Xie et al, 2019;Valentim et al, 2020). In accordance with this, Karayiğit et al (2018a) also assumed that these carbonate infillings are related to precipitation of Ca-rich solutions derived by penetration of hydrothermal solutions or leached solutions from overlying Early Cretaceous limestones via fault zones into coal seams in the studied wells.…”

Section: Origins Of Mineralssupporting

confidence: 58%

“…The existence of such brecciated vitrinite grains in the sample could suggest that these fragments either deformed during the coalification of parental coal seams or coal clast embedding sediments also experienced the same tectonic deformation as the encasing coal seams (Kožušníková et al, 1999;Hower et al, 2001;Xie et al, 2019). Furthermore, similar brecciated coal clasts within carbonate minerals-infillings were also reported within the Carboniferous marine carbonates in the western Kentucky coalfields (Valentim et al, 2013;Hower et al, 2020). Even though the coal metamorphism in the mentioned coalfield is quite more complex than the Kozlu coalfield, the %Rr values of brecciated clasts in the western Kentucky coalfields are high and are of anthracite-rank in comparison with Late Carboniferous seams due to high temperature thermal-fluid metamorphism.…”

Section: Ranks and Origins Of Coal Clastsmentioning

confidence: 65%

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Vitrinite reflectances and mineralogy of coal clasts in the Late Carboniferous sequences in the two-deep research wells from the Kozlu coalfield (Zonguldak Basin, NW Türkiye)

Karayi̇ǧi̇t

Oskay

2022

Bull.Min.Res.Exp.

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Fifty-four coal clast samples in the siliciclastic rocks (e.g., sandstone and conglomerate) were collected from cores of two-deep research wells (K20H and K20K) drilled at the Kozlu coalfield in Zonguldak Basin, and for the first time, they were evaluated using mineralogy by XRD and SEM-EDX and random vitrinite reflectance (%Rr) measurements in order to find out their origin and timing. Petrographic observations on polish surfaces show that the coal clasts are either entirely xylitic/vitrinitic particle or coals including a broader range of macerals. The detected minerals in the samples are mostly derived from the parental coal seams and, to lesser extent, precipitated from penetrated pore-water in the cleats/fractures of clasts. The %Rr values of coal clasts in Carboniferous sediments are generally relatively higher than measured in the coal seams due to weak oxidation during transportation. Furthermore, similar mineralogical and maceral compositions between coal clasts and coal seams imply that these clasts were mainly eroded during the peatification and/or early coalification of parental seams and display similar coalification patterns. The close %Rr value of a coal clast sample in the Early Aptian Zonguldak Formation and Carboniferous coal seams could suggest that this coal clast sample is presumably derived from the coal seams eroded during Early Aptian.

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Section: Origins Of Mineralssupporting

confidence: 58%

Section: Ranks and Origins Of Coal Clastsmentioning

confidence: 65%

Vitrinite reflectances and mineralogy of coal clasts in the Late Carboniferous sequences in the two-deep research wells from the Kozlu coalfield (Zonguldak Basin, NW Türkiye)

Karayi̇ǧi̇t

Oskay

2022

Bull.Min.Res.Exp.

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“…The inferred percentages of MgO by XRD are slightly higher than those determined by XRF chemical analysis, while the inferred proportions of Fe 2 O 3 are slightly lower than those by XRF. This is mainly due to the fact that dolomite CaMg(CO 3 ) 2 , particularly epigenetic ones in bituminous coals, often contains Fe [85][86][87], which, in most cases, is incorporated into the framework by the isomorphous substitution of Mg (Figure 9). This may explain the apparent over-estimation of MgO (Figure 8E) and the underestimation of Fe 2 O 3 in the inferred data from the XRD results 8F), relative to the chemical analyses (XRF results).…”

Section: Major-element Oxides and Comparison To Mineralogical Composi...mentioning

confidence: 99%

Optimization of Operating Parameters for Coal Low-Temperature Ashing: A Suitable and Efficient Treatment Method for Mineral Analysis in Coal

et al. 2022

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Low-temperature oxygen-plasma ashing plus X-ray diffraction analysis is one of the effective techniques to identify minerals in coal. However, previous publications have not provided any details of the exact low-temperature degrees and corresponding working conditions of ashers, and this could lead to two adverse effects without proper operating guidance: (1) a relatively high temperature (e.g., >150 °C) may cause alteration of minerals (particularly clay minerals), and (2) a relatively low temperature (e.g., <80 °C) may cause a long ashing time and incomplete ashing of organic matter. In this study, the authors introduced the most frequently used low-temperature plasma ashers (PVA TePla IoN 40 made in America and Quorum K1050X made in Britain) to reveal optional operating parameters for low-temperature ashing. The ashing effects were analyzed from the aspects of ash mass, X-ray diffraction patterns, and the qualitative and quantitative analysis of minerals. Considering all the factors above, it is concluded that the ashing is the best when the running power is 200 W for the IoN 40, at which the diffraction peaks of chlorite d(004) and kaolinite d(002) can be clearly distinguished by LTAs-XRD analysis. In addition, different low temperatures have certain influence on the crystal structure of minerals. When the power rises to above 300 W (about 150 °C), the crystal structure of minerals undergoes changes. The symmetry and integrity of the mineral peaks became worse, and destructive interference occurred between the spacing of reflection planes, resulting in significant decrease in diffraction peak intensity; thus, some trace minerals were unable to be identified. The study on the working parameters of the instrument would be helpful to ash coals more effectively and make qualitative and quantitative analysis of minerals more accurate.

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The influence of heating on the carbon isotope composition, organic geochemistry and petrology of coal from the Upper Silesian Coal Basin (Poland): An experimental and field study

Ciesielczuk

Górka

Fabiańska

et al. 2021

International Journal of Coal Geology

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Could hot fluids be the cause of natural pyrolysis at the ragged edge of Herrin coal, Millport 7 ½’ quadrangle, Hopkins County, Kentucky?

Cited by 4 publications

References 26 publications

Vitrinite reflectances and mineralogy of coal clasts in the Late Carboniferous sequences in the two-deep research wells from the Kozlu coalfield (Zonguldak Basin, NW Türkiye)

Vitrinite reflectances and mineralogy of coal clasts in the Late Carboniferous sequences in the two-deep research wells from the Kozlu coalfield (Zonguldak Basin, NW Türkiye)

Optimization of Operating Parameters for Coal Low-Temperature Ashing: A Suitable and Efficient Treatment Method for Mineral Analysis in Coal

The influence of heating on the carbon isotope composition, organic geochemistry and petrology of coal from the Upper Silesian Coal Basin (Poland): An experimental and field study

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