Article
Geochemistry & Geophysics
Zhong Han, Xiumian Hu, Robert J. Newton, Tianchen He, Benjamin J. W. Mills, Hugh C. Jenkyns, Micha Ruhl, Robert A. Jamieson
Summary: Researchers have studied high-resolution sulfur isotope records from the Tibetan Himalaya during the late Pliensbachian-Toarcian interval. They observed widespread ocean deoxygenation and significant spatial heterogeneity in seawater sulfur isotope compositions. Box-modeling analysis showed that the global reduction in seawater sulfate concentrations was responsible for the persistent positive sulfur isotope values in the later period.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Jianquan Yi, Xiugen Fu, Qiuding Du, Hengye Wei, Ahmed Mansour, Ying Nie, Yuhong Zeng, Jinxian Deng, Gang Zhou, Wenzhi Wang, Lijun Shen
Summary: The early Toarcian oceanic anoxic event (T-OAE) caused significant changes in marine and terrestrial environments, possibly due to an accelerated hydrological cycle. Evidence shows that during the Toarcian carbon-isotope excursion (T-CIE), an accelerated hydrological cycle led to increased transport of land plant organic matter to shelf seas. These findings contribute to a better understanding of the impact of global climate and environmental changes on terrestrial vegetation.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Multidisciplinary Sciences
Alexandra Kunert, Brian Kendall
Summary: Mesozoic oceanic anoxic events are widespread deposits of marine organic-rich mudrocks associated with mass extinctions and large igneous province emplacement. The Toarcian Oceanic Anoxic Event is an example of expanded ocean anoxia due to environmental perturbations linked to the Karoo-Ferrar igneous province. However, the global extent and nature of anoxia during the Toarcian Oceanic Anoxic Event remain poorly understood. This study estimates the global anoxic and euxinic seafloor areas before and during the event using rhenium and molybdenum enrichments in organic-rich mudrocks of the Fernie Formation in Canada. The results show an expansion of seafloor anoxia dominated by euxinia at the onset of the event, followed by a contraction, and the ocean redox trends align with patterns of biodiversity collapse and recovery.
NATURE COMMUNICATIONS
(2023)
Article
Geography, Physical
Wolfgang Ruebsam, Matias Reolid, Emanuela Mattioli, Lorenz Schwark
Summary: During the early Toarcian period, global environmental changes led to the expansion of oxygen-deficient conditions around the world, promoting the occurrence of the Toarcian Oceanic Anoxic Event. Higher-level global factors controlled temperature fluctuations, sea level evolution, oceanic circulation patterns, marine primary productivity, and stable carbon isotope excursions, while lower-level factors operated on individual basin bathymetry and paleogeography, regulating local to regional organic matter accumulation.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geography, Physical
Wolfgang Ruebsam, Emanuela Mattioli, Lorenz Schwark
Summary: Severe environmental changes during the early Toarcian led to the formation of a Toarcian Oceanic Anoxic Event, characterized by the widespread occurrence of organic carbon-rich sediments. Some depocenters showed low organic carbon accumulation rates, which can be explained by a reduced export efficiency of organic carbon due to a decline in mineral ballast. The sea level rise during the event resulted in shifts in depocenters and reduced nutrient fluxes, leading to decreased marine productivity and organic matter transport efficiency.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Geosciences, Multidisciplinary
David B. Kemp, Guillaume Suan, Alicia Fantasia, Simin Jin, Wenhan Chen
Summary: In this study, total organic carbon (TOC) data from 67 lower Toarcian sections were compiled to reconstruct the pattern of organic enrichment during the early Toarcian oceanic anoxic event (T-OAE). The findings suggest that redox conditions and sedimentation rates were major controls on organic enrichment and burial rates. Globally, there was a significant increase in TOC at most sites during the T-OAE.
EARTH-SCIENCE REVIEWS
(2022)
Article
Multidisciplinary Sciences
Sinjini Sinha, A. D. Muscente, James D. Schiffbauer, Matt Williams, Guenter Schweigert, Rowan C. Martindale
Summary: Research on three Lower Jurassic Lagerstatten deposits shows that they were all deposited during the Toarcian OAE period, with fossils mainly preserved through phosphatization. This indicates that these deposits were formed in conditions conducive to phosphatization, suggesting that the TOAE promoted exceptional preservation in marine environments globally.
SCIENTIFIC REPORTS
(2021)
Article
Geography, Physical
Wenhan Chen, David B. Kemp, Tianchen He, Chunju Huang, Simin Jin, Yijun Xiong, Robert J. Newton
Summary: The study presents new evidence of the early Toarcian Oceanic Anoxic Event in Scotland, showing geographic differences in environmental effects. The findings emphasize the spatial variability of deoxygenation, depending on water depth and basin hydrography. This supports the evidence of increased hydrological cycling and storminess at tropical and subtropical latitudes during the T-OAE in response to global warming.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geosciences, Multidisciplinary
Francisco J. Rodriguez-Tovar
Summary: The Toarcian Oceanic Anoxic Event (T-OAE) in the Early Jurassic period was a significant bioevent that caused major changes in marine and continental biota, with widespread oceanic anoxia being a key factor. Despite extensive research, controversies remain regarding its causes, duration, global character, and impact on biota. Additionally, ichnological information from T-OAE records worldwide indicates variations in bioturbation patterns related to changing oxygenation levels and environmental conditions.
EARTH-SCIENCE REVIEWS
(2021)
Article
Plant Sciences
F. Galasso, S. Feist-Burkhardt, E. Schneebeli-Hermann
Summary: The discovery of possible teratological features (i.e. unseparated spore tetrads and darkened sporomorphs) in the deposits of the Posidonia Shale Formation suggests environmental changes prior to the Toarcian Oceanic Anoxic Event (T-OAE).
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
(2022)
Article
Geochemistry & Geophysics
Wenhan Chen, David B. Kemp, Tianchen He, Robert J. Newton, Yijun Xiong, Hugh C. Jenkyns, Kentaro Izumi, Tenichi Cho, Chunju Huang, Simon W. Poulton
Summary: The period from the late Pliensbachian to early Toarcian experienced significant climatic and environmental changes, including the occurrence of the early Toarcian Oceanic Anoxic Event (T-OAE) and the Pliensbachian-Toarcian boundary event (Pl/To). Current knowledge of seawater redox conditions during this time is mainly based on European sections deposited in restricted basins, limiting our understanding of the redox evolution in the open ocean, particularly Panthalassa. This study presents Fe-speciation and redox-sensitive trace metal data from two Panthalassic Ocean sections, revealing anoxic-ferruginous conditions in the deep-water site and oxygenated to suboxic conditions in the shallow margin site. The observations suggest that upwelling of anoxic-ferruginous waters onto the shelf, driven by increased sea level and prevailing winds, led to Fe2+ oxidation in the oxygenated shallow waters.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geology
Viktoria Baranyi, Xin Jin, Jacopo Dal Corso, Zhiqiang Shi, Stephen E. Grasby, David B. Kemp
Summary: The Early Jurassic Toarcian oceanic anoxic event had significant impacts on both marine and terrestrial ecosystems. This study suggests that the collapse of the terrestrial ecosystem during this event was caused by the accumulation of toxic heavy metals, which poisoned plants and made them more vulnerable to other stresses. This eventually led to a widespread collapse across all terrestrial trophic levels.
Article
Geography, Physical
Wenhan Chen, David B. Kemp, Robert J. Newton, Tianchen He, Chunju Huang, Tenichi Cho, Kentaro Izumi
Summary: This study analyzes the sulfur isotopes and pyrite sulfur concentrations of rock samples from Japan to understand the impact of the early Toarcian Oceanic Anoxic Event (T-OAE) on the sulfur cycle. The results show significant positive shifts in sulfur isotopes and sulfur concentrations, indicating increased export production, preservation, and sedimentation rates. These findings suggest a previously unrecognized perturbation to the deep-water sulfur cycle during the T-OAE.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Oceanography
Yu Hong, Ying Zhang, Yan Du
Summary: The Southern Ocean is an important region for absorbing and storing anthropogenic heat. This study focuses on the south Indian Ocean and finds distinct warming minimum/cooling and freshening in the subtropical ocean thermocline. The freshening anomaly is advected to the north and subducted into the ocean interior, leading to fresher, deeper, and cooler isopycnal surfaces. This has implications for the future heat storage in the Southern Ocean.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Geology
Ying Nie, Xiugen Fu, Jintong Liang, Hengye Wei, Zhengan Chen, Fei Lin, Shengqiang Zeng, Yunhao Wu, Yi Zou, Ahmed Mansour
Summary: This study investigates the continental weathering and paleoceanographic conditions during the Toarcian Oceanic Anoxic Event (T-OAE) in the Eastern Tethys. The results show intensified continental erosion and increased terrigenous input during the T-OAE, leading to oxidizing conditions in the marine shelf environment. The study also reveals low organic carbon burial and oxygen-enriched conditions during the T-OAE.
SEDIMENTARY GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Erin E. Saupe, Huijie Qiao, Yannick Donnadieu, Alexander Farnsworth, Alan T. Kennedy-Asser, Jean-Baptiste Ladant, Daniel J. Lunt, Alexandre Pohl, Paul Valdes, Seth Finnegan
Article
Geosciences, Multidisciplinary
Alexandre Pohl, Yannick Donnadieu, Yves Godderis, Cyprien Lanteaume, Alex Hairabian, Camille Frau, Julien Michel, Marie Laugie, John J. G. Reijmer, Christopher R. Scotese, Jean Borgomano
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2020)
Article
Geosciences, Multidisciplinary
A. Toumoulin, Y. Donnadieu, J-B Ladant, S. J. Batenburg, F. Poblete, G. Dupont-Nivet
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2020)
Article
Geochemistry & Geophysics
F. Hodel, R. Grespan, M. de Rafelis, G. Dera, C. Lezin, E. Nardin, D. Rouby, M. Aretz, M. Steinnman, M. Buatier, F. Lacan, C. Jeandel, V. Chavagnac
Summary: The relationship between the establishment of the Antarctic Circumpolar Current (ACC) and the onset of the Oligocene glaciation is debated due to uncertainties in the timing of the Drake Passage gateway opening. The connection and deepening of the Southern Atlantic and Pacific oceans suggest that the ACC onset occurred around 31-26 million years ago, prior to the onset of the Oligocene glaciation at 33.7 Ma, indicating that atmospheric pCO(2) may have played a significant role in triggering the glaciation.
Review
Geosciences, Multidisciplinary
Benjamin J. W. Mills, Yannick Donnadieu, Yves Godderis
Summary: This paper introduces a method to run a climate enabled biogeochemical model over Phanerozoic timescales, termed Spatial Continuous Integration (SCION). By combining key methods in the literature, the model is able to compute whole Phanerozoic linked climate and biogeochemistry, and output geochemical isotope tracers.
Article
Geosciences, Multidisciplinary
Martin Roddaz, Guillaume Dera, Yannick Mourlot, Gerome Calves, Jung-Hyun Kim, Anne-Claire Chaboureau, Stephanie Mounic, Francois Raisson
Summary: Recent studies have highlighted the impact of Equatorial Atlantic Ocean opening on drainage reorganization and erosion of West African and northeastern Brazilian cratons during the Cretaceous. This study investigates the provenance of sediments deposited in the Suriname-Guyana basin during the Cretaceous-Paleocene, revealing the importance of sediment sources from the Guiana Shield and the role of active volcanism in the erosion process.
Article
Geosciences, Multidisciplinary
N. J. Burls, C. D. Bradshaw, A. M. De Boer, N. Herold, M. Huber, M. Pound, Y. Donnadieu, A. Farnsworth, A. Frigola, E. Gasson, A. S. von der Heydt, D. K. Hutchinson, G. Knorr, K. T. Lawrence, C. H. Lear, X. Li, G. Lohmann, D. J. Lunt, A. Marzocchi, M. Prange, C. A. Riihimaki, A-C Sarr, N. Siler, Z. Zhang
Summary: The Miocene epoch was a period of dynamic and warm climate, with reconstructed surface temperatures indicating warmth in midlatitude and polar regions. CO2 concentration was the primary factor controlling global warming, with other factors like paleogeography and ice sheets contributing to raising global temperatures. While progress has been made in simulating Miocene warmth, challenges still remain, emphasizing the need for community-led efforts in coordinating modeling and data activities.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Multidisciplinary Sciences
Thomas W. Wong Hearing, Alexandre Pohl, Mark Williams, Yannick Donnadieu, Thomas H. P. Harvey, Christopher R. Scotese, Pierre Sepulchre, Alain Franc, Thijs R. A. Vandenbroucke
Summary: Contrasting hypotheses regarding Cambrian continental configuration and climate were tested, with results indicating that the Antarctocentric paleogeographic paradigm can reconcile geological data and simulated Cambrian climate. Analysis suggests a greenhouse climate during the Cambrian animal radiation period.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Paulina S. Naetscher, Guillaume Dera, Carl J. Reddin, Patricia Rita, Kenneth De Baets
Summary: One common response of marine organisms to rapid warming is a reduction in body size, which may be due to changes in resource acquisition leading to morphological changes; during the PToB warming event, there were significant morphological changes in a marine predator, possibly as a result of indirect consequences like resource scarcity or hypercalcification.
SCIENTIFIC REPORTS
(2021)
Article
Geosciences, Multidisciplinary
Marie Laugie, Yannick Donnadieu, Jean-Baptiste Ladant, Laurent Bopp, Christian Ethe, Francois Raisson
Summary: The study conducted numerical simulations of the Cenomanian period to understand the controls on oceanic oxygen and the initial conditions of the Oceanic Anoxic Event 2 (OAE2). It found that paleogeography and ocean circulation were crucial factors in the development of oxygen depletion, with the Central American Seaway depth playing a significant role. The research suggests that changes in paleogeography and gateways were major influencers of oceanic circulation and oxygen distribution, creating conditions necessary for the OAE2 to occur.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Multidisciplinary Sciences
Luc Beaufort, Clara T. Bolton, Anta-Clarisse Sarr, Baptiste Sucheras-Marx, Yair Rosenthal, Yannick Donnadieu, Nicolas Barbarin, Samantha Bova, Pauline Cornuault, Yves Gally, Emmeline Gray, Jean-Charles Mazur, Martin Tetard
Summary: The study reveals that over the past 2.8 million years, Earth's orbital eccentricity has significantly influenced the morphological evolution of coccolithophores, leading them to adapt to different climate environments. Simulations suggest that changes in seasonal cycles directly impact the diversity of ecological niches in the ocean, affecting the morphology and carbonate export of coccolithophores.
Article
Multidisciplinary Sciences
Delphine Tardif, Agathe Toumoulin, Frederic Fluteau, Yannick Donnadieu, Guillaume Le Hir, Natasha Barbolini, Alexis Licht, Jean-Baptiste Ladant, Pierre Sepulchre, Nicolas Viovy, Carina Hoorn, Guillaume Dupont-Nivet
Summary: Recent studies indicate a growing sensitivity to orbital variations during the Eocene-Oligocene transition from greenhouse to icehouse climate. Numerical simulations show that orbital-induced biome variability could reconcile previous discrepancies between models and paleobotanical compilations. The simulations suggest that precession-driven intermittent monsoon-like climates in the Eocene and orbital variations in the Oligocene had a crucial role in major environmental changes and faunal dispersal events.
Article
Paleontology
Kenneth De Baets, Paulina S. Naetscher, Patricia Rita, Emmanuel Fara, Pascal Neige, Jeremie Bardin, Guillaume Dera, Luis Vitor Duarte, Zoe Hughes, Peter Laschinger, Jose Carlos Garcia-Ramos, Laura Pinuela, Christof Uebelacker, Robert Weis
Summary: The study suggests that the second-order Pliensbachian-Toarcian crisis significantly impacted major marine organisms, with belemnite diversity showing varying trends at different time periods. Taxonomic turnover and changes in body size were observed within individual basins, indicating a response to environmental shifts during the crisis.
SWISS JOURNAL OF PALAEONTOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Daniel J. Lunt, Fran Bragg, Wing-Le Chan, David K. Hutchinson, Jean-Baptiste Ladant, Polina Morozova, Igor Niezgodzki, Sebastian Steinig, Zhongshi Zhang, Jiang Zhu, Ayako Abe-Ouchi, Eleni Anagnostou, Agatha M. de Boer, Helen K. Coxall, Yannick Donnadieu, Gavin Foster, Gordon N. Inglis, Gregor Knorr, Petra M. Langebroek, Caroline H. Lear, Gerrit Lohmann, Christopher J. Poulsen, Pierre Sepulchre, Jessica E. Tierney, Paul J. Valdes, Evgeny M. Volodin, Tom Dunkley Jones, Christopher J. Hollis, Matthew Huber, Bette L. Otto-Bliesner
Summary: The results from simulations of the early Eocene climate optimum show that non-CO2 boundary conditions contribute significantly to the Eocene warmth. The ensemble of models generally shows reduced spread of global mean surface temperature response and increased climate sensitivity. Three models are consistent with proxies for global mean temperature, meridional SST gradient, and CO2. However, at a more regional scale, the models lack skill, particularly in the southwest Pacific region.
CLIMATE OF THE PAST
(2021)
Article
Geosciences, Multidisciplinary
Delphine Tardif, Frederic Fluteau, Yannick Donnadieu, Guillaume Le Hir, Jean-Baptiste Ladant, Pierre Sepulchre, Alexis Licht, Fernando Poblete, Guillaume Dupont-Nivet
CLIMATE OF THE PAST
(2020)