Article
Energy & Fuels
Yaru Zhang, Jinfeng Bai, Xiangyun Zhong, Lijun Jin, Yang Li, Haoquan Hu
Summary: The study demonstrates the use of RFMI obtained from the modified FAMM technique in evaluating coking coal, showing a linear correlation with vitrinite reflectance and increased sensitivity to coking properties. This can serve as a powerful supplement to existing coal evaluation standards.
Article
Geology
Yusuke Muramiya, Hidekazu Yoshida, Masayo Minami, Tomoyuki Mikami, Toshinori Kobayashi, Kousuke Sekiuchi, Nagayoshi Katsuta
Summary: This study presents detailed observations and analyses of the formation process of glendonite concretions and proposes a growth model controlled by phosphate concentration. The results demonstrate that organic matter in dead organisms served as a carbon source for both ikaite crystals and the surrounding concretions.
SEDIMENTARY GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Dane P. Synnott, Keith Dewing, Omid Haeri Ardakani, Lorenz Schwark, Emma L. Percy, Per Kent Pedersen
Summary: Thermal maturity is a crucial parameter in understanding the evolution of organic matter in sedimentary rocks. Various thermal maturity indicators have been proposed, including reflectance and Tmax. This study evaluates the applicability of different indicators using a well-constrained sample set from the Upper Cretaceous strata in western Canada.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Jian-Wei Zi, Birger Rasmussen, Janet R. Muhling, Ian R. Fletcher
Summary: Zircon U-Pb geochronology is crucial for calibrating the geologic timescale. This study found that zircon grains in the Brockman Iron Formation yielded ages younger than the host sedimentary rock. In situ U-Pb dating techniques were used to directly analyze zircon crystals, and the results were consistent with independent age constraints. The study also discovered that young zircon dates could be attributed to hydrothermal alteration.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Editorial Material
Geochemistry & Geophysics
Michael D. Lewan
Summary: Peters et al. (2018) present new hydrous pyrolysis data that characterize the coal-reflectance and suppressed-reflectance trends during thermal maturation of source rocks. The experimental results show that the reflectance of coal is reduced when mixed with isolated liptinite encased in G-class Portland cement. However, they do not include earlier experimental data that contradict this finding, which suggest that the reflectance of coal does not decrease when mixed with liptinite in source rocks.
ORGANIC GEOCHEMISTRY
(2023)
Article
Geology
Joaquin Salduondo, Marcos Comerio, Juan A. Pineda, Fernanda Cravero, Georgina Erra
Summary: This study focuses on the clay mineral assemblages in the Triassic Cuyo rift Basin, revealing the distribution characteristics and the influence of warm and semi-arid to humid climates on the mineral phases.
Article
Geochemistry & Geophysics
Shu Jiang, Chen Zhang, Keji Yang, Maoyun Wang, Haowei Yuan
Summary: The study characterized geothermal resources in different types of sedimentary basins of China and discussed the major factors influencing these resources in various regions. The geothermal resource potentials in China's different sedimentary basins vary due to factors such as topography, geological history, and thermal events.
Article
Geochemistry & Geophysics
Paula Alexandra Goncalves, Joao Graciano Mendonca Filho, Deolinda Flores
Summary: Organic petrology was used in this study to analyze cutting samples from the Middle-Upper Jurassic in the Ramalhal-1 well. The results indicated a low DOM content with predominance of inertinite macerals and solid bitumen, showing a range of thermal maturities from immature to mature stages. The samples also exhibited heterogeneous bitumen populations with varying thermal maturities, suggesting no in situ generation.
Article
Geochemistry & Geophysics
Xubin Wang, Lin Dong, Tong Li, Ziyi Wang, Changhu Zhang, Zhijun Jin, Jinhua Fu, Rukai Zhu, Kun Ling, Tianyu Wang
Summary: The alteration of carbonate caused by organic acid release during hydrocarbon generation is often overlooked in carbonate chemistry. However, in carbonate-deficient black shales, active hydrocarbon generation can dissolve original minerals and cause alteration, which can be studied at a microscale to understand burial diagenesis and its geochemical effects.
Article
Geology
Wei Zhai, En Zhang, Si-qi Zheng, M. Santosh, Xiao-ming Sun, He-cai Niu, Bin Fu, Yu Fu, Deng-feng Li, Yu-hang Jiang, Fei Liang, Wei-peng Lin, Yan Zhao, Song-yan Han
Summary: This study presents a detailed investigation of zircon crystals that crystallized from hydrothermal fluid. It highlights the significance of hydrothermal zircon as a tool for dating mineral deposits and as a major source of zirconium and hafnium.
ORE GEOLOGY REVIEWS
(2022)
Article
Energy & Fuels
Celeste D. Lohr, Paul C. Hackley
Summary: Vitrinite reflectance is a reliable technique for determining thermal maturity in sedimentary rocks, but collecting reflectance measurements can be time-consuming and subjective. Programmed pyrolysis data such as T max and hydrogen index are more efficient to obtain and independent of operator bias. Relational equations derived from programmed pyrolysis data can effectively calculate reflectance values in naturally matured samples, with good consistency compared to measured values. However, factors such as variable organic matter composition and differences in maturation reaction kinetics may affect the accuracy of these equations.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Energy & Fuels
Zahra Sadeghtabaghi, Mohsen Talebkeikhah, Ahmad Reza Rabbani
Summary: It is feasible to predict vitrinite reflectance using machine learning models, with decision tree model being the most accurate. Comparisons show that this method outperforms previous empirical equations for vitrinite reflectance prediction.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Energy & Fuels
Linda Burnaz, Laura Zieger, Joyce Schmatz, Anastasia Escallon Botero, Sebastian Amberg, Nicolai Thuens, Ralf Littke
Summary: Microscopic petrographic analysis of fine-grained sediments requires standardised, high-quality preparation of polished sections. This study evaluates the effect of alternative preparation techniques on the reliability and consistency of vitrinite reflectance data measured on shales. The results show that oil-based lubricant led to similar reflectance values compared to traditional water-based grinding and polishing, while BIB polishing increased vitrinite reflectance systematically.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Chemistry, Analytical
Shuo Sun, Zhihui Chen, Youqing Wu, Sheng Huang, Yonghui Bai, Shiyong Wu
Summary: This study investigates the blending of different types of coals for coking, and finds that DCLR and QM can partially replace coking coal (FM or JM) with certain limitations. The mechanism of action of DCLR and QM is explored, and it is found that they can modify the temperature range of interaction between metaplast and gas in the coking system, thereby increasing the thermal strength of coke.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Energy & Fuels
Nexxys C. Herrera Sanchez, Blanca A. Toro, Ricardo Ruiz-Monroy, Thomas Gentzis, Seare Ocubalidet, Humberto Carvajal-Ortiz
Summary: This study investigated the thermal maturity of Early Paleozoic strata in Northwestern Argentina using reflected light microscopy and Rock-Eval analyses. The results showed lower maturity in the Cordillera Oriental region and higher maturity in the Puna region, possibly due to a combination of hydrothermal fluids, volcanism, and tectonic events. Further research on geothermal parameters and startigraphy is needed to validate the preliminary models and propose new approaches for the Puna region.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Archaeology
Ewelina Agnieszka Mista-Jakubowska, Lukasz Kruszewski, Michal Przezdziecki, Michal Paczkowski, Leszek Marynowski, Aneta Maria Gojska, Magdalena Wilczopolska, Ryszard Diduszko, Katarzyna Pyzewicz, Tymoteusz Kosinski, Krystian Trela, Michal Szubski
Summary: Two chalcedonite artefacts from the Magdalenian site of Cmielow 95 in Poland, showing macroscopic features suggestive of thermal treatment, were analyzed using multiple instruments. The red upper layer consists of protohematite, indicating a temperature-driven transition from goethite to hematite. Traces of carbonized matter with saccharides, levoglucosan, and fatty acids were found in the red layer, suggesting the artefacts may be relics of cooking stones. PXRD data indicated higher temperatures in the bottom layer (up to around 800 degrees C) and a range of 200-300 degrees C for the red layer.
Article
Geology
Andreas Wetzel, Maciej Bojanowski
Summary: The study found that radish concretions formed in Middle Jurassic mudrock in southwest Germany around iron-sulphide lined tubes at burial depths of 5 to 8 meters, before growing vertically in compacting sediment and forming septarian cracks. These cracks formed while the concretions were still in a plastic state but sufficiently cemented. The research indicates that the radish concretions resided and grew for a long time within the sulphate reduction zone.
Article
Environmental Sciences
Leszek Marynowski, Bernd R. T. Simoneit
Summary: This study presents a comprehensive overview of saccharides in various environments, focusing on the common mono- and disaccharides found in environmental samples and sedimentary rocks. It also discusses the possible sources of saccharides and their potential applications in environmental and paleoenvironmental interpretations.
Article
Engineering, Environmental
Adam Nadudvari, Jerzy Cabala, Leszek Marynowski, Mariola Jablonska, Maria Dziurowicz, Dariusz Malczewski, Barbara Kozielska, Piotr Siupka, Zofia Piotrowska-Seget, Bernd R. T. Simoneit, Miroslaw Szczyrba
Summary: This study aims to understand the formation of mineral and organic mercury compounds in self-heating coal waste dumps. The results show the presence of Hg sulfides and other metal sulfides in the waste. The high concentration of Hg leads to elevated MeHg concentrations. Organic compounds identified in the waste and emitted gases could be responsible for MeHg formation.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Geochemistry & Geophysics
Justyna Domanska-Siuda, Krzysztof Nejbert, Boguslaw Baginski, Ray Macdonald, Jakub Kotowski, Marcin Stachowicz
Summary: A study on Chevkinite-group minerals in monzodiorites and granodiorites from Mazury Complex in north-eastern Poland revealed their transformation from pristine magmatic types to hydrothermally altered varieties. The unaltered phase is perrierite-(Ce), with a unique feature of having Al dominant in the C site. Hydrothermal alteration of perrierite-(Ce) showed two main trends: one with depletion in Ca, Fe, Si, Al, and Mg, and increasing Ti contents; the other with increases in Si, Ti, and Ca, and decreases in LREE, Y, and Mg, at a relatively constant Fe content. This study also identified a titanite-like phase formed during the alteration process, which is reported for the first time based on structural analysis.
MINERALOGY AND PETROLOGY
(2022)
Article
Geochemistry & Geophysics
L. M. E. Percival, L. Marynowski, F. Baudin, S. Goderis, D. De Vleeschouwer, M. Rakocinski, K. Narkiewicz, C. Corradini, A. -c. Da Silva, P. Claeys
Summary: In this study, nitrogen-isotope trends and geochemical evidence were used to investigate the relative importance of global-scale processes versus local influences on environmental change during the Frasnian-Famennian mass extinction. The results showed regional differences in the timing and nature of marine perturbations, suggesting that the variable influx of terrigenous nutrients played a role in driving environmental degradation at that time.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Article
Geology
Dmitry Zozulya, Ray Macdonald, Boguslaw Baginski, Petras Jokubauskas
Summary: The White Tundra pegmatites in NW Russia have diverse rare-metal mineralization and show various fractionation mechanisms.
ORE GEOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Jan Srodon, Axel Gerdes, Jan Kramers, Maciej J. Bojanowski
Summary: The sedimentary cover in the western part of the East European Craton contains records of glacial periods, and recent studies have used different dating methods to provide age constraints for these deposits, revealing the ages of the Sturtian glaciation and the periglacial period.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
Ray Macdonald, Boguslaw Baginski, Marcin Stachowicz, Dmitry Zozulya, Jakub Kotowski, Petras Jokubauskas
Summary: An unusual hydrothermal alteration scheme for chevkinite-(Ce) from the White Tundra pegmatite was presented. The altered chevkinite-(Ce) gradually transformed into a Pb-Ti-Fe-Si phase with enrichment in lead and uranium. The acidic nature of the fluids led to the formation of bastnasite-(Ce) instead of cerussite.
Article
Archaeology
Dagmara Wielgosz-Rondolino, Fabrizio Antonelli, Maciej J. Bojanowski, Patrick Degryse, Marcin Gladki, Mehmet Cemal Goncuoglu, Lorenzo Lazzarini, Leah Long, Sara Mandera
Summary: This paper presents the archaeometric investigation results on white and grey marbles from Aphrodisias using a wide range of analytical methods for the first time. The study aims to comprehensively evaluate the properties of Aphrodisian marbles. The research finds that there is a significant overlap in petrographic and geochemical features between the studied samples and other marbles used in Antiquity. However, no method used in this study is able to reliably distinguish between Aphrodisian marbles and other types. The depleted δC-13 values below +0.5‰ are the only provenance indicator for the grey variety from specific sectors. The presumed international use of Aphrodisian marbles may be difficult to verify based on these inconclusive outcomes. Rating: 8/10
Article
Geochemistry & Geophysics
Jan Srodon, Lynda Williams, Marek Szczerba, Tatiana Zaitseva, Maciej J. Bojanowski, Beata Marciniak-Maliszewska, Artur Kuligiewicz, Krzysztof Starzec, Zuzanna Ciesielska, Mariusz Paszkowski
Summary: Glauconites separated from sedimentary rocks in the western part of the East European Craton were found to have younger ages compared to the stratigraphic ages of their host sediments. The rejuvenated glauconite samples showed differences in their structure compared to the primary samples, indicating burial diagenetic alteration as the possible mechanism responsible for the rejuvenation.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geochemistry & Geophysics
Leszek Marynowski, Justyna Smolarek-Lach, Prakash K. Singh, Bernd R. T. Simoneit
Summary: Saccharides in fungi can serve as indicators of fungal activity and climate changes. The composition of saccharides differs between different types of fungi and can be used to distinguish between soft rot, brown rot, and white rot fungi. The presence of certain saccharides in lignite samples can provide insights into the climate conditions during their formation.
ORGANIC GEOCHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Zofia Dubicka, Maciej J. Bojanowski, Jelle Bijma, Ulf Bickmeyer
Summary: Calcium carbonate minerals produced by marine organisms are important in the global carbon cycle and sedimentation, affecting climate by regulating atmospheric CO2 levels. Foraminifera are important single-celled marine organisms that have been producing calcite shells for over 300 million years. This study investigated the biocalcification process of foraminifera by studying Amphistegina lessonii, and found that their calcite shells are formed through deposition of intracellularly formed Mg-rich amorphous calcium carbonate particles, involved with the activity of endosymbiotic microalgae and seawater-derived endocytic vesicles.
Article
Geology
Malgorzata Cegielka, Boguslaw Baginski, R. A. Y. Macdonald, Harvey E. Belkin, Jakub Kotowski, Brian G. J. Upton
Summary: This study presents compositional and textural data for zircon, secondary Zr-silicates, catapleiite, and elpidite in a peralkaline granite from Greenland. The zircon is stoichiometric, while the secondary Zr-silicates and catapleiite show variations in composition. The crystallization of elpidite followed the formation of catapleiite, and both minerals experienced element loss during late-stage hydrothermal alteration.
ACTA GEOLOGICA POLONICA
(2022)
Article
Geology
Malgorzata Cegielka, Boguslaw Baginski, Ray Macdonald, Beata Marciniak-Maliszewska, Marcin Stachowicz
Summary: A rare mineral, henuymcyerite, and an unidentified barium titanate silicate were found in the peralkaline granite of the Ilimaussaq Complex. These minerals interact with ilmenite inclusions and are believed to have formed during the hydrothermal stage.
ACTA GEOLOGICA POLONICA
(2022)
