Article
Geochemistry & Geophysics
Kunyue Ling, Hanjie Wen, Stephen E. Grasby, Haonan Zhao, Changzhou Deng, Runsheng Yin
Summary: This study reports new datasets of Hg concentrations, Hg isotopes, and organic carbon isotopes in two coastal shallow-water sections in the Guangxi region, SW China. The results show elevated Hg/TOC ratios and near-zero to positive Δ199Hg values across the Capitanian extinction, indicating extensive volcanic Hg input to the ocean via wet deposition. The negative δ13Corg excursion coincides with marine anoxia, peak Emeishan LIP magmatism, Hg/TOC anomalies, sea-level rise, and the Capitanian mass extinction.
Article
Geosciences, Multidisciplinary
Yuzhu Ge, Thomas J. Algeo, Huaguo Wen, Chen Zhang, Yiquan Ma, Chengbo Lian
Summary: The study reveals spatial and temporal variations of marine de-oxygenation during the Permian-Triassic transition in the eastern Paleotethys Ocean, showing shifts from oxygenation to de-oxygenation in different shelf settings. These variations are linked to marine sulfur, nitrogen, and phosphorous cycles, indicating a global shallow-marine de-oxygenation event during the latest Permian mass extinction, potentially caused by volcanic sulfur release from the Siberian Traps Large Igneous Province.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Kevin Wong, David Ferguson, Penny Wieser, Daniel Morgan, Marie Edmonds, Amdemichael Zafu Tadesse, Gezahegn Yirgu, Jason Harvey, Samantha Hammond
Summary: Significant volumes of magma intrude into the crust during continental break-up, altering the crust's thermo-mechanical structure and its response to extensional stresses, thus influencing rift evolution. This magmatism also fuels surface volcanic activity and contributes to global tectonic CO2 emissions. By analyzing olivine-hosted melt inclusions, we find evidence of a focused magma intrusion zone at the upper-lower crustal boundary in the Main Ethiopian Rift, suggesting the formation of a mechanically weak mid-crustal layer. These findings have important implications for understanding how magma addition can impact crustal rheology in a maturing continental rift.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Jianbo Chen, Guangyi Sun, Binjian Lu, Rong-yao Ma, Zhuang Xiao, Yao-feng Cai, Hua Zhang, Shu-zhong Shen, Feifei Zhang, Zhuo Feng
Summary: This study presents high-resolution Hg concentration and isotope records of two drill cores, showing significant Hg enrichments in coastal lowlands and background Hg levels in terrestrial uplands. These findings suggest that the Hg enrichments in the coastal lowland were primarily caused by enhanced terrestrial influxes, while the terrestrial upland had minimal influence from terrestrial and/or atmospheric depositions. A comprehensive evaluation of multiple lines of evidence is necessary to establish a robust causal link between volcanic activities and Hg enrichments in sedimentary records.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
J. Javier Alvaro, Mansoureh Ghobadi Pour, Teresa Sanchez-Garcia, Mohammad-Reza Kebria-ee Zadeh, Vachik Hairapetian, Leonid E. Popov
Summary: Recent geological mapping and chronostratigraphic dating in the eastern Alborz Mountains have revealed episodes of synsedimentary uplift and erosion associated with volcanic activities. The study also identified continuous magmatic pulses with alkaline to subalkaline activities, suggesting an intraplate field affinity compatible with OIB-like mantle sources. These findings provide insights into the geological history of the region, including lithospheric doming and rift pulses that shaped a large igneous province.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Yu Jiao, Lian Zhou, Thomas J. Algeo, Jun Shen, Lanping Feng, Yating Hu, Jinhua Liu, Liwei Chi, Minghui Shi
Summary: This study provides insights into the regional arc magmatism linked to volcanism in South China during the Permian-Triassic transition.
Article
Multidisciplinary Sciences
Jun Shen, Jiubin Chen, Jianxin Yu, Thomas J. Algeo, Roger M. H. Smith, Jennifer Botha, Tracy D. Frank, Christopher R. Fielding, Peter D. Ward, Tamsin A. Mather
Summary: The Permian mass extinction was caused by volcanic activity in the Siberian Traps, and the land records from southern Pangea provide evidence of long-distance atmospheric transfer of volcanogenic mercury during this event. These findings demonstrate the far-reaching effects of the Siberian Traps and refine the stratigraphic placement of the extinction interval in the Karoo Basin.
NATURE COMMUNICATIONS
(2023)
Article
Geosciences, Multidisciplinary
Timothy Chapman, Luke A. Milan, Ian Metcalfe, Phil L. Blevin, Jim Crowley
Summary: This study presents a detailed record of a late Permian volcanic event in eastern Australia, which lasted for approximately 4.21 million years and involved the eruption of a significant amount of silicic magma. The researchers also found that the timing of the volcanic activity coincided with a decline in species abundance and the disappearance of Glossopteris forests, suggesting that these global volcanic eruptions triggered the late Permian mass extinction event.
Article
Geosciences, Multidisciplinary
Michal Rakocinski, Daria Ksiazak, Agnieszka Pisarzowska, Leszek Marynowski
Summary: Through high-resolution inorganic geochemistry and framboidal pyrite analyses, it was found that the mid-Tournaisian event in the Carnic Alps was associated with widespread anoxic/euxinic conditions and intense volcanic activity. Additionally, significantly anomalous Hg content was observed for the first time during this period.
Article
Geography, Physical
Kunio Kaiho, Stephen E. Grasby, Zhong-Qiang Chen
Summary: A series of environmental extreme events and mass extinctions were discovered at the Guadalupian-Lopingian boundary (GLB), which may have been caused by volcanic eruptions of the Emeishan large igneous province (LIP). The study suggests that volcanic activity related to the Emeishan LIP may have led to these environmental extreme events and mass extinctions.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Multidisciplinary Sciences
Jun Shen, Runsheng Yin, Thomas J. Algeo, Henrik H. Svensen, Shane D. Schoepfer
Summary: By analyzing a section in Japan, researchers have found that the isotopically light carbon released during the end-Triassic mass extinction may have come from the combustion of organic-rich sediments, rather than deep-Earth volcanic gases.
NATURE COMMUNICATIONS
(2022)
Article
Geosciences, Multidisciplinary
Luis A. Buatois, Violeta Borruel-Abadia, Raul De la Horra, Ana Belen Galan-Abellan, Jose Lopez-Gomez, Jose F. Barrenechea, Alfredo Arche
Summary: Research from the Iberian Basin in Central Spain shows a dramatic decrease in bioturbation intensity on land by the end of the Capitanian, coinciding with an increase in weathering intensity, acidic conditions, and a collapse in plant communities. This bioturbation crisis may have contributed to a reduction in mechanical reworking of sediment and soil, affected geochemical recycling, increased sediment acidification, and impacted ecosystem structure. Identifying this infaunal crisis on land underscores the ecological severity of mass extinctions and emphasizes the significance of feedback loops in riparian ecosystems.
Article
Geography, Physical
Zeyang Liu, David Selby
Summary: Research indicates that studying multiple sections across different depositional environments may provide a more comprehensive understanding of the global perturbations related to volcanism and continental weathering intensity during the Permian-Triassic boundary interval.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Multidisciplinary Sciences
Gilles Didier, Michel Laurin
Summary: The new method takes into account the possibility of diversification before extinction and estimates extinction times using the entire phylogenetic tree, resulting in more accurate confidence intervals. The approach is applied to study the extinction time of three Permo-Carboniferous synapsid taxa, supporting the idea of a progressive decline in biodiversity throughout the late Kungurian.
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)