Article
Geosciences, Multidisciplinary
Shengchao Yang, Wenxuan Hu, Junxuan Fan, Yiying Deng
Summary: By analyzing and correlating the geochemical features of bentonites, this study established a set of new geochemical fingerprints for identifying invisible volcanic ash layers in shales. The study reconstructed volcanic activities and discussed the impact of volcanism on mass extinction and climate events.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Andrew Yoram Glikson
Summary: The buried Deniliquin multiple-ring impact structure (DMS) in southeastern Australia, with a diameter of 520 km, is believed to have caused the Late Ordovician glaciation and mass extinction event. This event, known as the Hirnantian, is considered to be the result of the Deniliquin mega-impact event and is second only to the Permian-Triassic boundary extinction in severity. Geophysical evidence supports the impact origin of the DMS, including its distinct multiple-ring pattern, central magnetically quiet core, radial faults, and underlying mantle dome.
Article
Geography, Physical
Chengsheng Jin, Zhiwei Liao, Gary G. Lash
Summary: The study suggests that fluctuations in redox conditions, in addition to commonly cited thresholds of bimetal ratios, may have influenced the redox trends during the Ordovician-Silurian transitional interval. The strong correlation between changing redox conditions and fossil distributions implies that dynamic and ferruginous conditions contributed to biotic crises. The coupling of total organic carbon (TOC) and redox proxies highlights the importance of prolonged anoxia or euxinia in the accumulation and preservation of organic matter.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geography, Physical
Yangbo Lu, Jun Shen, Yuxuan Wang, Yongchao Lu, Thomas J. Algeo, Shu Jiang, Detian Yan, Qiyang Gou
Summary: The Late Ordovician mass extinction (LOME) occurred in two discrete pulses, linked to environmental stresses caused by the onset and termination of the Hirnantian Glaciation. Recent studies have suggested a potential connection between LOME and massive volcanism during the Ordovician-Silurian transition (OST), based on significant mercury anomalies in the South China region. However, the study finds that volcanic activity in South China during the OST was a regional phenomenon, and there is a discrepancy between the distribution of bentonite beds and the overall redox evolution in the region. Mercury isotope analysis suggests that seawater was the source of mercury enrichment during the OST. Therefore, the LOME may not have been caused by massive volcanism, but rather by long-term cooling, weathering, anoxia, and marine eutrophication.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geochemistry & Geophysics
Shengchao Yang, Wenxuan Hu, Xiaolin Wang
Summary: Studies have found widespread oceanic upwelling in the Yangtze region during the Late Ordovician to early Silurian transition, possibly driven by glacially-influenced temperature differences between the poles and equator and longshore trade winds. This upwelling event may have led to organic matter accumulation in South China and could be considered a geological indicator of Late Ordovician glaciation and the Boda warm Event prior to the Hirnantian cooling.
Article
Energy & Fuels
Juan Teng, Bei Liu, Maria Mastalerz, Juergen Schieber
Summary: Organic matter-hosted pores play a crucial role in controlling the porosity and gas content of gas shales. However, the development and preservation mechanisms of organic pores are poorly understood due to the inability to distinguish organic matter types under the scanning electron microscope (SEM). This study reveals important insights into the thermal evolution of organic matter and the development of organic pores in source-rock reservoirs through organic petrography and SEM analysis.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2022)
Article
Paleontology
Lei -Ming Yin, Tenger Borjigin, Zhi-Ji Ou, Li-Zeng Bian
Summary: This study reports the paleogeographic location of South China during the Late Ordovician-early Silurian and the correlation of fossil assemblages between upper Ordovician successions in South China and elsewhere in the world. It also provides the first description and biostratigraphic data of acritarch assemblages from the Wufeng Formation and Kuanyinchiao Formation in South China.
Review
Geosciences, Multidisciplinary
Jiri Fryda, Oliver Lehnert, Michael M. Joachimski, Peep Mannik, Michal Kubajko, Michal Mergl, Juraj Farkas, Barbora Frydova
Summary: This study reviews the significant perturbations in the Phanerozoic carbon cycle, particularly focusing on the Mid-Ludfordian Carbon Isotope Excursion (MLCIE) and its associated climate changes, marine temperature variations, and geological events. The research findings provide evidence for global cooling during the MLCIE, along with occurrences of climate cooling events, oceanic anoxic events, and extinctions, highlighting the complex interactions between carbon cycling, climatic shifts, and ecosystem disruptions during this period in the late Silurian.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geography, Physical
Shengchao Yang, Wenxuan Hu, Xiaolin Wang, Junxuan Fan
Summary: The Ordovician-Silurian transition was a critical geological interval with significant biological events and environmental changes. Research has shown that changes in ocean environment are a main cause of events affecting the biosphere. Nitrogen isotopes play a significant role in elucidating oceanic redox structure and geochemical evolution during the transition period.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geosciences, Multidisciplinary
Licai Song, Qing Chen, Huijun Li, Changzhou Deng
Summary: This study provides a high-resolution, multi-proxy record of mercury variations in the Yangtze Platform, South China, and reveals four distinct stages of the atmospheric-terrestrial-oceanic-climatic system during the Ordovician-Silurian transition. Two major volcanic events are found to be closely associated with climate changes, which have significant implications for the Late Ordovician Mass Extinction.
GEOSCIENCE FRONTIERS
(2023)
Article
Geochemistry & Geophysics
Jun Shen, Thomas J. Algeo, Qinglai Feng
Summary: High mercury concentrations in the Ordovician-Silurian transition sections of South China come from the uptake of mercury from seawater. Mercury isotope studies support a marine source, ruling out a volcanic source. Local environmental conditions play a dominant role in mercury enrichment in the South China strata.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geography, Physical
Yu Liu, Yuanchun Li, Mingcai Hou, Jun Shen, Thomas J. Algeo, Junxuan Fan, Xiaolin Zhou, Qing Chen, Zongyuan Sun, Chao Li
Summary: The study suggests that sulfur-normalized Hg concentrations are the best proxy to assess Hg anomalies in Upper Ordovician sediments of the Yangtze Platform. The findings show that the dominant source of Hg in the study sections is terrigenous, rather than volcanic.
GLOBAL AND PLANETARY CHANGE
(2023)
Article
Geosciences, Multidisciplinary
Dongsheng Wang, Yang Liu, Jinchuan Zhang, Yue Lang, Zhen Li, Zhongzheng Tong, Longfei Xu, Zexin Su, Jialiang Niu
Summary: The Late Ordovician-Early Silurian is a significant period in geological history, characterized by various events in biology, environment, and geology. Understanding the changes in marine primary productivity during this period can provide insights into fundamental scientific questions.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Evolutionary Biology
B. Gudveig Baarli, Bing Huang, Luana S. Maroja
Summary: This study investigates the early evolution of the Atrypida order through Silurian time. It presents a phylogenetic analysis of 70 genera and 41 characters, revealing the relationships and evolutionary patterns within the group. The study also suggests the need for subdivision and redefinition of certain subfamilies and families within the order. The findings shed light on the importance of the Great Ordovician Biodiversification Event and Late Ordovician Mass Extinction.
JOURNAL OF SYSTEMATIC PALAEONTOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Pengyuan Zhang, Yongli Wang, Zhifu Wei, Gen Wang, Ting Zhang, Wei He, Xueyun Ma, He Ma, Jingyi Wei, Chenxi Zhu
Summary: This study analyzed the elemental geochemistry of the Wufeng-Longmaxi Formation shale in the upper Yangtze Platform to explore the late Ordovician-early Silurian paleoenvironment and the origins of organic matter accumulation (OMA) and carbon isotope excursions (CIEs). The results showed that local tectonic and volcanic activities controlled the OMA during the late Katian, while the global climate influenced the OMA during the early Rhuddanian. Sea level changes and rapid uplifting resulted in organic matter depletion during the late Rhuddanian and Aeronian.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Paleontology
Marco Vecoli, John H. Beck, Paul K. Strother
JOURNAL OF PALEONTOLOGY
(2015)
Article
Plant Sciences
Paul K. Strother, Alfred Traverse, Marco Vecoli
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2015)
Editorial Material
Plant Sciences
Brigitte Meyer-Berthaud, Thomas Servais, Marco Vecoli, Philippe Gerrienne
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2016)
Editorial Material
Plant Sciences
Brigitte Meyer-Berthaud, Thomas Servais, Marco Vecoli, Philippe Gerrienne
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2016)
Article
Plant Sciences
Philippe Gerrienne, Thomas Servais, Marco Vecoli
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2016)
Review
Paleontology
Thomas Servais, Stewart G. Molyneux, Jun Li, Hendrik Nowak, Claudia V. Rubinstein, Marco Vecoli, Wen Hui Wang, Kui Yan
Article
Plant Sciences
Merrell A. Miller, Marco Vecoli, Christian Cesari
Article
Plant Sciences
Paul K. Strother, Wilson A. Taylor, John H. Beck, Marco Vecoli
Article
Energy & Fuels
Amalia Spina, Marco Vecoli, Armelle Riboulleau, Geoff Clayton, Simonetta Cirilli, Alessandro Di Michele, Annunziato Marcogiuseppe, Roberto Rettori, Paola Sassi, Thomas Servais, Laurent Riquier
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2018)
Article
Geography, Physical
Armelle Riboulleau, Amalia Spina, Marco Vecoli, Laurent Riquier, Melesio Quijada, Nicolas Tribovillard, Olivier Averbuch
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2018)
Article
Plant Sciences
Wenhui Wang, Thomas Servais, Kui Yan, Marco Vecoli, Jun Li
Article
Multidisciplinary Sciences
Abderrazak El Albani, Stefan Bengtson, Donald E. Canfield, Armelle Riboulleau, Claire Rollion Bard, Roberto Macchiarelli, Lauriss Ngombi Pemba, Emma Hammarlund, Alain Meunier, Idalina Moubiya Mouele, Karim Benzerara, Sylvain Bernard, Philippe Boulvais, Marc Chaussidon, Christian Cesari, Claude Fontaine, Ernest Chi-Fru, Juan Manuel Garcia Ruiz, Francois Gauthier-Lafaye, Arnaud Mazurier, Anne Catherine Pierson-Wickmann, Olivier Rouxel, Alain Trentesaux, Marco Vecoli, Gerard J. M. Versteegh, Lee White, Martin Whitehouse, Andrey Bekker
Article
Plant Sciences
Kaya Ertug, Marco Vecoli, Sedat Inan
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2019)
Article
Geology
Hani Boukhamsin, Daniel Peyrot, Simon Lang, Marco Vecoli
Summary: A palynological analysis of samples from the Biyadh Formation in the Arabian Gulf revealed diverse and well-preserved palynological assemblages, supporting earlier geological and stratigraphic models and indicating a late Barremian-early Aptian age. The fluctuations of dinocyst abundance and diversity were useful for detecting fine-scale sea-level changes in carbonate platforms. The composition of terrestrial assemblages reflects a seasonal, humid climate with episodic droughts.
CRETACEOUS RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Shaun Hayton, Andrew J. Rees, Marco Vecoli
Article
Plant Sciences
Gar W. Rothwell, Ruth A. Stockey
Summary: This study utilizes anatomical analysis of fossils from Vancouver Island, Canada, to support the development of a whole plant concept for the Eocene species of Gleichenia and provide data for the first organismal concept of an extinct species of Gleichenia from the Cenozoic fossil record. The findings suggest that the characteristics of the Gleicheniaceae family were present during the Cretaceous and Paleogene periods, with modern species well-established and diversifying.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2024)
Article
Plant Sciences
Kathrin Ganz, Cesar Morales-Molino, Erika Gobet, Dmytro Kiosak, Nadezhda Kotova, Jacqueline van Leeuwen, Sergey Makhortykh, Christoph Schworer, Willy Tinner
Summary: This study presents a palaeoecological reinvestigation from the Kardashynskyi mire in southern Ukraine, reconstructing the vegetation dynamics, fire history, and land use for the past 8300 years. The results show that both climate and human activities have driven the vegetation changes, and the remaining special vegetation types are severely threatened under current conditions.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2024)
Article
Plant Sciences
Willem O. van der Knaap, Bas van Geel, Jacqueline F. N. van Leeuwen, Frans Roescher, Dick Mol
Summary: Pollen analysis of fossilized teeth from a giant deer found in The Netherlands provides insights into the diet, landscape, and climate of the specimen. The study suggests that the giant deer most likely lived during the early Eemian or an early Weichselian interstadial.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2024)
Article
Plant Sciences
Yun Guo, Yu Zhou, Josef Psenicka, Jiri Bek, Jana Votockova Frojdova, Zhuo Feng
Summary: A new species of adpressed leptosporangiate fern, Szea yunnanensis sp. nov., is described from Yunnan Province, Southwest China. The fronds of this new species have unique characteristics such as fertile pinnules with triangular to falcate shape and abaxial sori arranged in one row on each side of the midvein.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2024)
Article
Plant Sciences
Adele C. M. Julier, Glynis J. Humphrey, Caitlin Dixon, Lindsey Gillson
Summary: The relationships between woody vegetation cover and fire, climate, herbivory, and human activities in African savanna ecosystems are complex. Fire suppression policies implemented in a national park in northeast Namibia from 1888 to 2005 did not lead to noticeable decreases in fire or enhanced tree recruitment, suggesting that fire occurrence in savanna ecosystems is more closely linked to climate than management. Fire management should adapt to rainfall variability and integrate customs of early dry season burning.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2024)
Article
Plant Sciences
Milan Libertin, Jiri Kvacek, Jiri Bek
Summary: This paper revises the genus Aberlemnia from the Early Devonian of Scotland based on its type-material A. caledonica and describes a new species, Aberlemnia krizii sp. nov, from the Silurian of Czechia. The study provides detailed diagnoses and highlights the differences between the two species. Aberlemnia is positioned on an evolutionary clade line leading to the Lycophytina.
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2024)