Article
Multidisciplinary Sciences
Margriet L. Lantink, Joshua H. F. L. Davies, Maria Ovtcharova, Frederik J. Hilgen, John W. Valley, Paleoproterozoic Joffre
Summary: Cyclostratigraphic analysis and high-precision U-Pb zircon dating of the lower Paleoproterozoic Joffre Member of the Brockman Iron Formation in NW Australia reveal evidence of Milankovitch forcing and provide insights into the Earth-Moon system evolution.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Geosciences, Multidisciplinary
Jeremy J. Gabriel, Eduard G. Reinhardt, Xueke Chang, Janok P. Bhattacharya
Summary: This study investigates the elemental signature of fine-grained sedimentary rock obtained using energy-dispersive micro-X-ray fluorescence (isXRF). The results show that the elemental signature obtained from the isXRF core scanner correlates well with the results from ICP analysis and can accurately identify different lithologies. In addition, the high-sampling resolution data from the isXRF core scanner provides advantages in detecting short-term sedimentary events.
MARINE AND PETROLEUM GEOLOGY
(2022)
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
Geology
Aleksander Majchrzyk, Wojciech Kozlowski, Anna Zylinska
Summary: The precipitation of calcium carbonate, both biotic and abiotic, plays a crucial role in modern and ancient global biogeochemical cycles. While in the present-day oceans, widespread precipitation of inorganic CaCO3 only occurs under extraordinary circumstances, in the geological record, authigenic carbonate cements were common before the end of the Neoproterozoic. The Cambrian Alum Shale Basin of the Baltica palaeocontinent presents an anomalous record of Precambrian-like seafloor encrusting carbonates, indicating a driver-trigger relation between authigenic carbonate formation and the Steptoean Positive Carbon Isotope Excursion (SPICE).
Article
Geography, Physical
Micha l Rakocinski, Jakub Kucharczyk, Agnieszka Pisarzowska, Micha l Zaton, Leszek Marynowski, Sven Hartenfels, Ralph Thomas Becker
Summary: The mid-Tournaisian Event, a global anoxic event that occurred around 355 million years ago, resulted in drastic facies changes in the Rhenish Massif. The lower and middle parts of the event were deposited under anoxic conditions, while the upper part was deposited under restricted but better-oxygenated conditions. The presence of a minor Hg anomaly confirms volcanic activity during the event.
GLOBAL AND PLANETARY CHANGE
(2023)
Article
Geosciences, Multidisciplinary
Michal Rakocinski, Daria Ksiazak, Agnieszka Pisarzowska, Michal Zaton, Markus Aretz
Summary: The mid-Tournaisian black radiolarian cherts of the Lydiennes Formation in the Montagne Noire, southern France, reveal the occurrence of the mid-Tournaisian anoxic event, also known as the Lower Alum Shale Event. This event is associated with global marine transgression and is characterized by changes in sedimentation from pelagic carbonate to black organic-rich siliceous shales and radiolarites. In this study, high-resolution inorganic geochemistry and framboidal pyrite analyses were performed to understand the depositional conditions during this event. The results indicate periodic dysoxic to anoxic bottom-water conditions and a possible influence of increased regional volcanic activity.
GEOLOGICAL MAGAZINE
(2023)
Article
Geosciences, Multidisciplinary
Arne T. Nielsen, Jannik H. Christiansen, Isabella P. Hvas, Thomas Storskov, Magne Hoyberget
Summary: A new species of olenid trilobite, Peltura undulata n. sp., is described from the Furongian Parabolina lobata Zone in the Scandinavian Alum Shale Formation. This new species is characterized by distinctive pygidial features and is comparatively small in size. The stratigraphic range of the co-occurring trilobite Trilobagnostus holmi is also discussed.
NORWEGIAN JOURNAL OF GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Arne T. Nielsen, Jannik H. Christiansen, Isabella P. Hvas, Thomas Storskov, Magne Hoyberget
Summary: A new species of olenid trilobite, Peltura undulata n. sp., was discovered in the Scandinavian region and Germany. It has unique features on the pygidium and is restricted to the upper Cambrian Parabolina lobata Zone.
NORWEGIAN JOURNAL OF GEOLOGY
(2022)
Article
Geology
Andreas Koutsodendris, Kai Nakajima, Stefanie Kaboth-Bahr, Melissa A. Berke, Allison M. Franzese, Ian R. Hall, Sidney R. Hemming, Janna Just, Leah J. LeVay, Jorg Pross, Rebecca Robinson
Summary: This study focuses on the paleoclimate and ecosystem variability in Africa during the Plio/Pleistocene period, using XRF core-scanning records from IODP Site U1478 near the Limpopo River mouth in the SW Indian Ocean. The results indicate that elemental distribution in the cores is mainly controlled by terrigenous input rates, with some influence from bottom-current transport and post-depositional processes. The study also reveals quasi-cyclical variability in the log(Ti/Ca) ratio across the entire record, closely matching orbital parameters, but with varying cyclical behavior through different time intervals.
NEWSLETTERS ON STRATIGRAPHY
(2021)
Article
Geosciences, Multidisciplinary
Arne Thorshoj Nielsen, Line Frigaard Andersen
Summary: The study reviewed and revised the Furongian trilobite-agnostoid fauna from the Alum Shale Formation of Bornholm, Denmark, updating the taxonomy of all species and illustrating the best preserved specimens. A total of 39 olenid and 5 agnostoid taxa were recorded, including a new species. The presence of three agnostoid and 14 trilobite zones was confirmed by fossils, with all six Furongian superzones developed on Bornholm.
BULLETIN OF THE GEOLOGICAL SOCIETY OF DENMARK
(2021)
Article
Geography, Physical
Bernd Zolitschka, An-Sheng Lee, Daniela Piraquive Bermudez, Thomas Giesecke
Summary: High-resolution geochemical and sedimentological data from Lagoa Dourada in South Brazil reveal four distinct depositional processes linked to different environmental conditions throughout the Holocene. These processes are associated with open grassland, increased precipitation, wetter climate, and human-induced land use change. The study provides insights into the consequences of past hydroclimatic variability on the environment and can help evaluate future climate change projections.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Oceanography
Wang Longsheng, Zhou Bin, Zheng Bang, Wang Ke, Mei Xi, Wang Qing, Wang Xiaohui, Zheng Hongbo
Summary: This study presents high-resolution geochemical data of sediments from the inner shelf mud wedge in the East China Sea, revealing a correlation between elemental compositions and the evolution of the East Asian Summer Monsoon. The findings suggest that the geochemical compositions are influenced by the EASM evolution, variable El Nino/Southern Oscillation (ENSO), and local oceanic thermohaline circulation.
JOURNAL OF OCEAN UNIVERSITY OF CHINA
(2021)
Article
Geography, Physical
Sujeong Park, Jaesoo Lim, Youngeun Kim, Kyung-Hoon Shin, Hyoun Soo Lim
Summary: By examining terrestrial input proxies in coastal sediments of western Korea, including grain size, elemental ratios, and C/N ratios, it was found that elemental ratios can serve as a proxy for past East Asian Summer Monsoon (EASM) changes. The study also revealed the existence of synchronous global monsoon events induced by a northward shift in the intertropical convergence zone (ITCZ). Furthermore, it demonstrated the influence of the 8.2-ka cooling event on the EASM through a southward shift in the ITCZ, leading to weakened EASM in the Northern Hemisphere and intensified South American Summer Monsoon in the Southern Hemisphere.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geography, Physical
Jaesoo Lim, In-Kwon Um, Sangheon Yi, Chang-Pyo Jun
Summary: This study reconstructs the changes in decadal-scale extreme flooding events from floodplain sediments in the middle reach of the Nakdong River in Korea. The findings reveal a significant change in the frequency of extreme events around 3700 years ago in East Asia and demonstrate the importance of investigating the role of past deep-water circulation in hydroclimate changes.
QUATERNARY RESEARCH
(2022)
Article
Geochemistry & Geophysics
Zhengfu Zhao, Xiongqi Pang, Caineng Zou, Alexander J. Dickson, Anirban Basu, Zhaojie Guo, Songqi Pan, Arne T. Nielsen, Niels H. Schovsbo, Zhenhua Jing, Tais W. Dahl
Summary: The SPICE event is a significant carbon cycle perturbation in the Cambrian period, accompanied by climate changes and mass extinction of shallow-shelf fauna. The exact timing, duration, and extent of changing redox conditions across the SPICE event, as well as its influences on biotic evolution, remain unclear.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Andy Gale, Sietske Batenburg, Rodolfo Coccioni, Zofia Dubicka, Elisabetta Erba, Francesca Falzoni, Jim Haggart, Takishi Hasegawa, Christina Ifrim, Ian Jarvis, Hugh Jenkyns, Agata Jurowska, Jim Kennedy, Matteo Maron, Giovanni Muttoni, Martin Pearce, Maria Rose Petrizzo, Isabella Premoli-Silva, Nicolas Thibault, Silke Voigt, Michael Wagreich, Irek Walaszczyk
Summary: Following the unanimous vote of the Executive Committee of International Union of Geological Sciences, the Global boundary Stratotype Section and Point (GSSP) for the base of the Campanian Stage has been confirmed. The GSSP is located at the 221.53 m level in the Bottaccione Gorge section at Gubbio, Umbria-Marche Basin, Italy, and is characterized by a magnetic polarity reversal event from Chron 34n to Chron C33r. The continuity of sedimentation across the Santonian-Campanian boundary interval is supported by evidence from carbon isotope record, micro- and nannofossil biostratigraphy, and deep-water cherty limestones.
Article
Geosciences, Multidisciplinary
Jihede Haj Messaoud, Nicolas Thibault, Mohammed H. Aljahdali, Chokri Yaich
Summary: In this study, we integrate previous Bayesian and astronomically tuned age calibrations of the calcareous nannofossil events and our large-scale correlations to discuss the application of standard calcareous nannofossil zonal schemes in the SW Neo-Tethys platform during a period of significant perturbations. The study focuses on two marine on-land sections and shows that calcareous nannofossils in the SW Neo-Tethys margin were affected by the closure of the eastern Neo-Tethys and the episodic restriction of the westward subtropical Eocene Neo-Tethys current.
JOURNAL OF AFRICAN EARTH SCIENCES
(2023)
Article
Geology
Ian Jarvis, Martin A. Pearce, Johannes Monkenbusch, Agata Jurkowska, Clemens Ullmann, Zofia Dubicka, Nicolas Thibault
Summary: This study describes the stratigraphy and palynology of the Newhaven Chalk in the upper Santonian-lower Campanian age at Seaford Head, England. The carbon-isotope event (CIE) stratigraphy of the section is refined using a new high-resolution bulk-sediment carbonate carbon stable-isotope (813Ccarb) curve. The results are compared to a palynological study at Bocieniec, Poland. The study establishes a stratigraphic framework and correlations to sections in England, France, Germany, and Italy using carbon isotope curves and biostratigraphic records.
CRETACEOUS RESEARCH
(2023)
Article
Geochemistry & Geophysics
Leibo Bian, Anthony Chappaz, Niels H. Schovsbo, Xiaomei Wang, Wenzhi Zhao, Hamed Sanei
Summary: The late Cambrian extinction - Early Ordovician biodiversification is a crucial lower Paleozoic biological change, but the mechanisms behind this transition are not well understood. This study reconstructed the paleoenvironmental changes and assessed the Cambro-Ordovician biological turnover. The results showed that depositional environments became extremely sulfidic with lower nutrient inputs, leading to the Steptoean Positive Carbon Isotope Excursion event. Intense volcanic activity in the early Jiangshanian contributed to recurrent bio-calamities. Later, enhanced terrestrial weathering and oceanic water upwelling facilitated biological recovery and laid the foundation for the Great Ordovician Biodiversification Event.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Paleontology
Maria Paulsen, Nicolas Thibault
Summary: This study documents a unique record of small nannoliths that have not been previously described or rarely described from the Hettangian to lower Pliensbachian sediments in Wales. Some of these fossils are assigned to ascidians, which were commonly observed in the upper Rhaetian, indicating their resilience during the end-Triassic mass extinction. One newly described nannolith, Quadrifolium hesselboi, is similar to forms found in the upper Rhaetian, suggesting its survival from the mass extinction event. The study also reveals high-amplitude changes in the abundance of nannoliths, schizosphaerellids, and coccoliths during the Hettangian, indicating a stepwise recovery from the end-Triassic crisis followed by the establishment of more stable environmental conditions.
PAPERS IN PALAEONTOLOGY
(2023)
Article
Geography, Physical
Nanna Andreasen, Rebecca Jackson, Arka Rudra, Henrik Nohr-Hansen, Hamed Sanei, Jorgen Bojesen-Koefoed, Marit-Solveig Seidenkrantz, Christof Pearce, Nicolas Thibault, Sofia Ribeiro
Summary: The origin, composition and preservation of organic matter in a marine sediment core recovered from the NE Greenland shelf were investigated using different techniques. The study revealed the continuous but variable input of land-derived organic carbon to the marine environment, with the highest input during the late Younger Dryas. The sediments represented a significant sink of recycled organic carbon, with a large proportion of inert carbon and terrigenous organic carbon.
Article
Geochemistry & Geophysics
Emma R. Haxen, Niels H. Schovsbo, Arne T. Nielsen, Sylvain Richoz, David K. Loydell, Nicole R. Posth, Donald E. Canfield, Emma U. Hammarlund
Summary: Recent studies indicate that oxygen levels in the early Paleozoic oceans likely remained below modern levels. This suggests a prolonged period of hypoxia, lasting around 100 million years after the Cambrian, during which early animals thrived in low oxygen conditions. The results support the idea that early animal evolution and the oxygenation of the atmosphere-hydrosphere system were closely related.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Rui Zhang, David B. Kemp, Nicolas Thibault, Mads E. Jelby, Mingsong Li, Chunju Huang, Yu Sui, Zhixiang Wang, Dongyang Liu, Shizhen Jia
Summary: In this study, a cyclostratigraphic analysis of iron and titanium elemental data from the marine mudstone succession of the Sancerre-Couy drill core was conducted. The analysis revealed long-eccentricity, short-eccentricity, and obliquity cycles. Based on astronomical tuning, an astrochronology for the Pliensbachian Stage was constructed. This study provides new constraints on the chronology of the Pliensbachian and its relationship with paleoclimate and sea-level changes.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Yan Yuan, Tianyu Chen, Feifei Zhang, Yuanyuan Liu, Guolin Xiong, Guang-Yi Wei, Tais W. Dahl, Wen Yan, Hong-Fei Ling, Hai Cheng, Shu-Zhong Shen
Summary: The uranium isotope ratio in marine carbonates is an important tool for reconstructing past oceanic redox conditions. However, diagenetic processes may complicate this proxy by introducing isotopically heavy uranium into the carbonates. This study quantifies the valence states of trace amounts of uranium in geological carbonate samples and finds that modern coral carbonates faithfully record uranium from seawater. Surprisingly, drill core samples from a modern coral carbonate platform show a significant positive correlation between a specific valence state of uranium and the uranium isotope ratio, suggesting the presence of this valence state in marine carbonates and its influence on the uranium isotope ratio. The study suggests that coupled valence and isotope analyses of uranium in marine carbonates could provide critical constraints for reconstructing marine redox evolution.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geography, Physical
Jihede Haj Messaoud, Nicolas Thibault, David De Vleeschouwer, Johannes Monkenbusch
Summary: This study investigates the timing of the Middle Eocene Climatic Optimum (MECO) peak warming and the maximum abundance of nummulites in the Southern Mediterranean. The results indicate that the maximum accumulation of nummulites and negative excursion of δ18O occurred during the MECO's warming peak (40.07 to 40 Ma), 200 kyr after the middle Eocene third-order maximum flooding surface.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geology
Umid Kakemem, Laura J. Cotton, Nasrin Hadavand-Khani, Roghayeh Fallah-Bagtash, Nicolas Thibault, Kresten Anderskouv
Summary: The Taleh Zang Formation in the Lurestan Basin, SW Iran, contains large platform carbonates rich in large benthic foraminifera. The formation is dominated by alveolinids and various other genera of foraminifera, along with minor components such as calcareous algae, gastropods, echinoids, and bivalves. Biostratigraphy analysis indicates that the formation is of early Ypresian age and was deposited in a shallow water environment within the euphotic zone. The presence of intervals displaying shallowing and deepening trends suggests that regional tectonics and eustasy played significant roles in the formation of these deposits.
SEDIMENTARY GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Morgan T. Jones, Ella W. Stokke, Alan D. Rooney, Joost Frieling, Philip A. E. Pogge von Strandmann, David J. Wilson, Henrik H. Svensen, Sverre Planke, Thierry Adatte, Nicolas Thibault, Madeleine L. Vickers, Tamsin A. Mather, Christian Tegner, Valentin Zuchuat, Bo P. Schultz
Summary: There is a temporal correlation between the peak activity of the North Atlantic Igneous Province (NAIP) and the Paleocene-Eocene Thermal Maximum (PETM), suggesting that the NAIP may have initiated and/or prolonged this extreme warming event. However, corroborating a causal relationship is hampered by a scarcity of expanded sedimentary records that contain both climatic and volcanic proxies.
CLIMATE OF THE PAST
(2023)
Article
Geosciences, Multidisciplinary
Bo P. Schultz, Jennifer M. Huggett, George L. Kennedy, Paul Burger, Henrik Friis, Anne M. Jensen, Marie Kanstrup, Stefano M. Bernasconi, Nicolas Thibault, Clemens V. Ullmann, Madeleine L. Vickers
Summary: Ikaite and pseudomorphs thereafter (glendonites) have the potential to be a powerful tool for palaeo-climatic studies as a low-temperature proxy. However, there is still much uncertainty surrounding the factors that drive ikaite formation, especially the prerequisite thermal and chemical conditions. Additionally, the process of ikaite to glendonite transformation is not fully understood and it is unclear which calcite phases in glendonites originate from ikaite and which are later diagenetic calcites.
NORWEGIAN JOURNAL OF GEOLOGY
(2023)
Article
Green & Sustainable Science & Technology
Prinu Narayanan, Maryam Khosravi, Rikke Weibel, Leonardo Teixeira Pinto Meirles, Niels Hemmingsen Schovsbo, Erling H. Stenby, Wei Yan
Summary: This study aims to investigate salt precipitation and formation damage through CO2 injection in underground storage reservoirs, using a long tube apparatus for experimentation and numerical simulation for evaluation.
CARBON CAPTURE SCIENCE & TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
