TY - JOUR AU - Arysanto, A. AU - Burnaz, L. AU - Zheng, T. AU - Littke, R. TI - Geochemical and petrographic evaluation of hydrous pyrolysis experiments on core plugs of Lower Toarcian Posidonia Shale: Comparison of artificial and natural thermal maturity series JF - INTERNATIONAL JOURNAL OF COAL GEOLOGY J2 - INT J COAL GEOL VL - 284 PY - 2024 SP - 104459 SN - 0166-5162 DO - 10.1016/j.coal.2024.104459 UR - https://m2.mtmt.hu/api/publication/34758712 ID - 34758712 LA - English DB - MTMT ER - TY - JOUR AU - Kus, J. AU - Dolezych, M. AU - Schneider, W. AU - Hower, J.C. AU - Hofmann, Tamás AU - Visiné Rajczi, Eszter AU - Bidló, András AU - Bolodár-Varga, Bernadett AU - Sachsenhofer, R.F. AU - Bechtel, A. AU - Stojanović, K. AU - Životić, D. AU - Kojić, I. AU - Mastalerz, M. AU - Graupner, T. AU - Lukens, W.E. AU - Donaldson, L. TI - High-cellulose content of in-situ Miocene fossil tree stumps and trunks from Lusatia lignite mining district, Federal Republic of Germany JF - INTERNATIONAL JOURNAL OF COAL GEOLOGY J2 - INT J COAL GEOL VL - 286 PY - 2024 PG - 41 SN - 0166-5162 DO - 10.1016/j.coal.2024.104494 UR - https://m2.mtmt.hu/api/publication/34754866 ID - 34754866 AB - Second Miocene Seam Complex (2nd MFK; germ.: 2. Miozäner Flözkomplex) holds many in-situ, not permineralised fossil tree stumps and trunks with high-cellulose contents. The state of preservation of a set of in-situ fossil trees (Taxodioxylon cryptomerioides, Sciadopityoxylon wettsteinii, and Quasisequoioxylon piskowitzense) collected from three open-cast mines (Welzow-Süd, Meuro, and Piskowitz) in Lusatia lignite mining district, Federal Republic of Germany was investigated using a multi-method research schema. Examination of preservation state of thermally immature fossil woods revealed: (1) well-preserved (non-deformed, non-degraded, and non-flattened) textinite, (2) a retained structural integrity represented by multilayered (multi-zoned) cells with primary, secondary cell wall, and middle lamella, (3) microfracturing restricted to secondary walls only, (4) preservation of polyphenolic parenchyma cells (PP cells), (5) excellent preservation of pits in ray tracheids, (6) presence of amorphous silica (opal-A) coating, and (7) crystalline silica (opal-CT) fillings of small-bladed crystals. Thermogravimetric analysis results showed dissimilar gelification status of fossil samples, supporting chlorite holocellulose assay results. The latter indicated anomalously high-cellulose values (15.6–37.6% holocellulose). The micro-FTIR data obtained revealed an excellent preservation of both hemicellulose (bands at 1740 and 1245 cm−1) and cellulose (bands at 1110 and 1040 cm−1). Micro-FTIR spectrometry indicated lack of preferential hydrolytic removal of polysaccharides in examined samples. Biomarker patterns in lignite revealed forested and prevailing reed-mire vegetation. The results indicated lower contribution of Cupressaceae and emergent macrophyta to precursor organic matter of Welzow-Süd in comparison to Piskowitz lignite. Piskowitz lignite formed in permanent mire with stable water table under reducing, mesotrophic conditions. In contrast, more pronounced water level fluctuations (reducing to slightly oxic settings) and/or post-depositional events are postulated for Welzow-Süd samples. Biomarker assemblages obtained from fossil wood show a distinct dominance of diterpenoids and δ13C values (−24.6 ‰ to −20.3 ‰) that clearly confirm gymnosperm sources. Distributions of diteprenoids and sesquiterpenoids, as well as fatty acids indicate the higher amount of saturated diterpenoids (pimarane, abietane) in fossil than in modern wood. This indicates reducing conditions promoting hydrogenation reactions. In addition to low Eh, preservation of cellulose in fossil wood was also favored by acidic conditions, very low degrees of aerobic fungal degradation, and protection of wood by Cupressaceae-derived resins. While δ13C values of fossil wood are generally consistent with stratigraphic trends and chemotaxonomical classification, slightly elevated δ13C values recorded in T. cryptomerioides and S. wettsteinii in Welzow-Süd and Meuro open-cast mines, respectively, compared to published δ13C data of fossil gymnosperm wood are also indicative for good cellulose preservation. Both preservation of in-situ Miocene fossil stumps and trunks and retention of high-cellulose contents are suggested to be related to high-amplitude temporal fluctuations associated with repeated eustatically-controlled wet-dry cycling inducing: (1) weathering of tuff- and rhyolite-dominated acidic volcanics and Lausitz granodiorite, (2) associated erosion of saprolites, and (3) peat-sourced circulation of humic acid- and fulvic acid-rich waters. The latter led to the formation of Middle Miocene kaolinite deposits, as well as to the release of silicic acid and its subsequent precipitation in form of opal-A. The latter influenced preservation of high-cellulose contents in fossil wood. LA - English DB - MTMT ER - TY - JOUR AU - Holland, B. AU - Alsen, P. AU - Nytoft, H.P. AU - Rudra, A. AU - Sanei, H. AU - Petersen, H.I. TI - Quality and composition of Lower Cretaceous carbonate source rocks and seepage oils in the Belize Basin, southern Belize, Central America JF - INTERNATIONAL JOURNAL OF COAL GEOLOGY J2 - INT J COAL GEOL VL - 285 PY - 2024 SN - 0166-5162 DO - 10.1016/j.coal.2024.104478 UR - https://m2.mtmt.hu/api/publication/34754565 ID - 34754565 N1 - Belize Minerals Ltd., Punta Gorda, Belize Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, Copenhagen, 1350, Denmark HPN Kemi, Helsebakken 8, Hellerup, 2900, Denmark Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus, 8000, Denmark Export Date: 25 March 2024 CODEN: IJCGD Correspondence Address: Petersen, H.I.; Geological Survey of Denmark and Greenland (GEUS), Øster Voldgade 10, Denmark; email: hip@geus.dk LA - English DB - MTMT ER - TY - JOUR AU - Abdi, Zain AU - Rimmer, Susan M. TI - Organic petrology and geochemistry of the Devonian-Mississippian bakken formation, Williston Basin, North Dakota JF - INTERNATIONAL JOURNAL OF COAL GEOLOGY J2 - INT J COAL GEOL VL - 282 PY - 2024 PG - 20 SN - 0166-5162 DO - 10.1016/j.coal.2023.104420 UR - https://m2.mtmt.hu/api/publication/34625902 ID - 34625902 LA - English DB - MTMT ER - TY - JOUR AU - Fabianska, M. J. AU - Ciesielczuk, J. AU - Szczerba, M. AU - Misz-Kennan, M. AU - Wieclaw, D. AU - Szram, E. AU - Nadudvari, A. AU - Ciesielska, Z. TI - Weathering alterations of coal mining wastes geochemistry, petrography, and mineralogy, a case study from the Janina and Marcel Coal Mines, Upper Silesian Coal Basin (Poland) JF - INTERNATIONAL JOURNAL OF COAL GEOLOGY J2 - INT J COAL GEOL VL - 281 PY - 2024 PG - 23 SN - 0166-5162 DO - 10.1016/j.coal.2023.104407 UR - https://m2.mtmt.hu/api/publication/34625901 ID - 34625901 LA - English DB - MTMT ER - TY - JOUR AU - Sanei, Hamed AU - Rudra, Arka AU - Przyswitt, Zia Moller Moltesen AU - Kousted, Sofie AU - Sindlev, Marco Benkhettab AU - Zheng, Xiaowei AU - Nielsen, Soren Bom AU - Petersen, Henrik Ingermann TI - Assessing biochar's permanence: An inertinite benchmark JF - INTERNATIONAL JOURNAL OF COAL GEOLOGY J2 - INT J COAL GEOL VL - 281 PY - 2024 PG - 20 SN - 0166-5162 DO - 10.1016/j.coal.2023.104409 UR - https://m2.mtmt.hu/api/publication/34625900 ID - 34625900 LA - English DB - MTMT ER - TY - JOUR AU - Baboolal, Anastasia A. AU - Littke, Ralf AU - Zieger, Laura TI - Organic geochemistry and organic petrology of Oligocene and Miocene lignites, subbituminous and high volatile bituminous coals and carbonaceous shales in northern and central Trinidad JF - INTERNATIONAL JOURNAL OF COAL GEOLOGY J2 - INT J COAL GEOL VL - 282 PY - 2024 PG - 14 SN - 0166-5162 DO - 10.1016/j.coal.2023.104437 UR - https://m2.mtmt.hu/api/publication/34625896 ID - 34625896 LA - English DB - MTMT ER - TY - JOUR AU - Moroeng, Ofentse M. AU - Murathi, Bridgette AU - Wagner, Nicola J. TI - Enrichment of rare earth elements in epigenetic dolomite occurring in contact metamorphosed Witbank coals (South Africa) JF - INTERNATIONAL JOURNAL OF COAL GEOLOGY J2 - INT J COAL GEOL VL - 282 PY - 2024 PG - 18 SN - 0166-5162 DO - 10.1016/j.coal.2023.104405 UR - https://m2.mtmt.hu/api/publication/34625894 ID - 34625894 LA - English DB - MTMT ER - TY - JOUR AU - Cao, Huairen AU - Shi, Jun AU - Zhan, Zhao-Wen AU - Wu, Hao AU - Wang, Xiaoyu AU - Cheng, Xin AU - Li, Haolin AU - Zou, Yan-Rong AU - Peng, Ping'an TI - Shale oil potential and mobility in low- to medium-maturity lacustrine shales: A case study of the Yanchang Formation shale in southeast Ordos Basin, China JF - INTERNATIONAL JOURNAL OF COAL GEOLOGY J2 - INT J COAL GEOL VL - 282 PY - 2024 PG - 13 SN - 0166-5162 DO - 10.1016/j.coal.2023.104421 UR - https://m2.mtmt.hu/api/publication/34575594 ID - 34575594 AB - Oil mobility is essential for the evaluation of shale oil resources, yet there has been limited research conducted on the oil mobility of low-to medium-maturity lacustrine shale. This study integrates multiple methodologies such as organic geochemistry, mineralogy, oil-kerogen adsorption-swelling experiments, and in-situ conversion pro-cess (ICP) models to evaluate the mobility and potential for shale oil in the lacustrine shale of the Yanchang Formation in the Yaoqu 1 (YQ1) well situated in the southeastern region of the Ordos Basin. The Chang 7 shales are categorized as highly favorable source rocks, nonetheless, the oil contained within these layers predomi-nantly exists in an adsorbed-swelling state, resulting in limited mobility as indicated by the oil saturation index, a modified oversaturation index, and production index. Therefore, the utilization of existing conventional tech-niques for shale oil exploitation is not viable for the Chang 7 shale characterized by low to medium maturity in the study area. Nevertheless, during the ICP, the quantity and mobility of oil within the Chang 7 shales exhibit a substantial increase as temperature rises. Moreover, once the Chang 7 type II shales reach a maturity level of around 0.91%Ro, they demonstrate noteworthy prospects for shale oil production. The findings of this study serve as a valuable reference for guiding the advancement of in-situ conversion process technology in the study area, while also offering substantial evidence for addressing the intricate challenge of crude oil mobility in low-to medium-maturity lacustrine shale reservoirs. LA - English DB - MTMT ER - TY - JOUR AU - Nádudvari, Á. AU - Krzykawski, T. AU - Jabłońska, M. AU - Fabiańska, M. AU - Skrzyńska, K. AU - Abramowicz, A. AU - Książek, M. AU - Ciesielczuk, J. TI - Organic minerals in a self-heating coal-waste dump in Upper Silesia, Poland: Structure, formation pathways and environmental issues JF - INTERNATIONAL JOURNAL OF COAL GEOLOGY J2 - INT J COAL GEOL VL - 281 PY - 2024 SN - 0166-5162 DO - 10.1016/j.coal.2023.104403 UR - https://m2.mtmt.hu/api/publication/34547354 ID - 34547354 N1 - University of Silesia in Katowice, Faculty of Natural Sciences, 60 Będzińska Street, Sosnowiec, 41-200, Poland University Laboratories of Atmospheric Survey, Faculty of Natural Sciences, 60 Będzińska Street, Sosnowiec, 41-200, Poland University of Silesia in Katowice, Faculty of Science and Technology, 14 Bankowa Street, Katowice, 40-007, Poland Export Date: 31 January 2024 CODEN: IJCGD Correspondence Address: Nádudvari, Á.; University of Silesia in Katowice, 60 Będzińska Street, Poland; email: adam17183@gmail.com LA - English DB - MTMT ER -