Article
Geography, Physical
Tatiana Savranskaia, Ramon Egli, Jean-Pierre Valet, Franck Bassinot, Laure Meynadier, Didier L. Bourles, Quentin Simon, Nicolas Thouveny
Summary: The global production rate of the cosmogenic isotope Be-10 has been reconstructed from sediment records to estimate geomagnetic dipole moment variations, with findings showing no direct proportionality between sedimentary Be-10/Be-9 ratios and cosmogenic Be-10 production rate. Climatic modulation and geomagnetic control during field reversals are important factors affecting Be-10/Be-9 ratios.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Richard K. Bono, Greig A. Paterson, Andrew J. Biggin
Summary: Understanding the evolution of Earth's magnetic field is important for understanding core processes, constraining plate tectonics, and atmospheric shielding. The PINT database provides curated records of site mean estimates of magnetic field strength. In this study, a minor update to the PINT database was made by adding 295 records from 34 studies. The updated database was then used to define a continuous model of the dipole field, and three dipole field strength models were presented.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Steve P. Lund, Martha Schwartz, Lloyd Keigwin
Summary: New paleomagnetic records recovered from deep-sea sediment cores of the Bahama Outer Ridge reveal the occurrence of the Blake Event around 119-126,000 years BP within Marine Isotope Stage 5. The Blake Event is characterized by a local magnetic field reversal and our detailed analysis confirms deviations from long-term averages on various timescales.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2021)
Article
Geography, Physical
Minjie Zheng, Anna Sturevik-Storm, Andreas Nilsson, Florian Adolphi, Ala Aldahan, Goran Possnert, Raimund Muscheler
Summary: The method of reconstructing geomagnetic dipole moment using cosmogenic radionuclide records from ice cores involves removing climate-related impacts to yield more accurate results.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geochemistry & Geophysics
Sanja Panovska, Monika Korte, Jiabo Liu, Norbert Nowaczyk
Summary: Reconstructions of the geomagnetic field on long time scales are crucial to understanding the geodynamo processes in the Earth's core. The geomagnetic field exhibits a variety of variations, with different geomagnetic excursions showing distinct features and energy distribution.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Steve Lund, Gary Acton, Brad Clement, Makoto Okada, Lloyd Keigwin
Summary: This paper summarizes the paleomagnetic secular variation (PSV) and excursions recorded from sediment measurements in the western North Atlantic Ocean at ODP Sites 1060, 1061, 1062, and 1063. It identifies various features and dates the records using different methods. The records from Sites 1062 and 1063 are found to be the most consistent and high-resolution.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2022)
Article
Geochemistry & Geophysics
Steve Lund
Summary: This study develops composite high-resolution, full-vector PSV records for the last 380 ka from three regions in the western North Atlantic Ocean, identifying common features and excursions. The findings provide important insights into the evolution of Earth's magnetic field.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2022)
Article
Geochemistry & Geophysics
Ahmed Nasser Mahgoub, Monika Korte, Sanja Panovska
Summary: Magnetic field reversals are irregular events in Earth's history when the geomagnetic field changes its polarity. A study using a global set of paleomagnetic data from sediments and volcanic rocks covering the period 900-700 ka explored the evolution of the latest field reversal, the Matuyama-Brunhes reversal (MBR). Four phases of field instability were observed, with the reversal process lasting approximately 30,000 years and ending around 770 ka.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
B. A. Buffett
Summary: Temporal trends in the paleomagnetic dipole moment exhibit positive skewness, with larger positive trends occurring less frequently than negative trends. Numerical geodynamo models suggest that this skewness is associated with fluid upwelling and magnetic-flux expulsion at the core-mantle boundary.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geochemistry & Geophysics
Marie Troyano, Yves Gallet, Agnes Genevey, Vladimir Pavlov, Alexandre Fournier, France Lagroix, Makhsuma Niyazova, Dzhamal Mirzaakhmedov
Summary: Direct measurements of Earth's magnetic field intensity and direction have been available since the mid-19th century, allowing accurate determination of its variations. This study focuses on archeomagnetic intensity data from baked clay bricks in Central Asia to analyze the axial dipole behavior during the late 18th century, showing a relative minimum in dipole magnitude. The reliability of the gufm1 model is crucial for interpretation, as the axial dipole evolution appears non-linear.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2021)
Article
Geosciences, Multidisciplinary
Alicia Gonzalez-Lopez, Maria Luisa Osete, Saioa A. Campuzano, Alberto Molina-Cardin, Pablo Rivera, Francisco Javier Pavon-Carrasco
Summary: The eccentric dipole (ED) shows different behaviors during extreme geomagnetic events, providing potential insights into changes in the outer core region.
Article
Multidisciplinary Sciences
Nicolas Brehm, Marcus Christl, Timothy D. J. Knowles, Emmanuelle Casanova, Richard P. Evershed, Florian Adolphi, Raimund Muscheler, Hans-Arno Synal, Florian Mekhaldi, Chiara I. Paleari, Hanns-Hubert Leuschner, Alex Bayliss, Kurt Nicolussi, Thomas Pichler, Christian Schluchter, Charlotte L. Pearson, Matthew W. Salzer, Patrick Fonti, Daniel Nievergelt, Rashit Hantemirov, David M. Brown, Ilya Usoskin, Lukas Wacker
Summary: The Sun occasionally produces intense solar energetic particle (SEP) events that disrupt the near-Earth radiation environment. By analyzing C-14 concentrations in tree-rings, two spikes in atmospheric C-14 occurring in ancient times were discovered, providing critical information on the occurrence of extreme solar events in the past.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Partha Sarathi Jena, Ravi Bhushan, Shivam Ajay, Ankur J. Dabhi, Mahesh Gaddam, A. K. Sudheer
Summary: Quaternary paleoclimatic and paleomagnetic reconstructions using marine sediment cores face challenges in establishing chronologies beyond the radiocarbon dating limit. This study presents a method using beryllium isotopes (10Be and 9Be) to date a sediment core from the central Indian Ocean, allowing for dating as far back as -350 ka. Anomalies in 10Be/9Be ratios were observed, attributed to geomagnetic field intensity variations and environmental modulations. This research emphasizes the importance of 10Be as a chronological tool while acknowledging its limitations.
Review
Geography, Physical
S. Molliex, G. Jouet, N. Freslon, D. L. Bourles, C. Authemayou, J. Moreau, M. Rabineau
EARTH SURFACE PROCESSES AND LANDFORMS
(2017)
Article
Geosciences, Multidisciplinary
E. Perouse, M. Sebrier, R. Braucher, N. Chamot-Rooke, D. Bourles, P. Briole, D. Sorel, D. Dimitrov, S. Arsenikos
INTERNATIONAL JOURNAL OF EARTH SCIENCES
(2017)
Article
Environmental Sciences
Marianna Jagercikova, Sophie Cornu, Didier Bourles, Olivier Evrard, Christine Hatte, Jerome Balesdent
JOURNAL OF SOILS AND SEDIMENTS
(2017)
Article
Geochemistry & Geophysics
Quentin Simon, Didier L. Bourles, Nicolas Thouveny, Chorng-Shern Horng, Jean-Pierre Valet, Franck Bassinot, Sandrine Choy
EARTH AND PLANETARY SCIENCE LETTERS
(2018)
Article
Geochemistry & Geophysics
Quentin Simon, Nicolas Thouveny, Didier L. Bourles, Franck Bassinot, Tatiana Savranskaia, Jean-Pierre Valet
EARTH AND PLANETARY SCIENCE LETTERS
(2018)
Article
Geochemistry & Geophysics
Jean-Pierre Valet, Franck Bassinot, Quentin Simon, Tatiana Savranskaia, Nicolas Thouveny, Didier L. Bourles, Anouk Villedieu
EARTH AND PLANETARY SCIENCE LETTERS
(2019)
Article
Environmental Sciences
C. Crouzet, B. Wilhelm, P. Sabatier, F. Demory, N. Thouveny, C. Pignol, J. -L. Reyss, O. Magand, A. Jeltsch-Thoemmes, M. Bajard, L. Augustin, F. Arnaud
JOURNAL OF PALEOLIMNOLOGY
(2019)
Article
Geochemistry & Geophysics
Celine Martin, Guillemette Menot, Nicolas Thouveny, Nina Davtian, Valerie Andrieu-Ponel, Maurice Reille, Edouard Bard
ORGANIC GEOCHEMISTRY
(2019)
Review
Geography, Physical
Celine Martin, Guillemette Menot, Nicolas Thouveny, Odile Peyron, Valerie Andrieu-Ponel, Vincent Montade, Nina Davtian, Maurice Reille, Edouard Bard
QUATERNARY SCIENCE REVIEWS
(2020)
Article
Multidisciplinary Sciences
Paula A. Rodriguez-Zorro, Marie-Pierre Ledru, Edouard Bard, Olga Aquino-Alfonso, Adriana Camejo, Anne-Laure Daniau, Charly Favier, Marta Garcia, Thays D. Mineli, Frauke Rostek, Fresia Ricardi-Branco, Andre Oliveira Sawakuchi, Quentin Simon, Kazuyo Tachikawa, Nicolas Thouveny
SCIENTIFIC REPORTS
(2020)
Article
Geography, Physical
Tatiana Savranskaia, Ramon Egli, Jean-Pierre Valet, Franck Bassinot, Laure Meynadier, Didier L. Bourles, Quentin Simon, Nicolas Thouveny
Summary: The global production rate of the cosmogenic isotope Be-10 has been reconstructed from sediment records to estimate geomagnetic dipole moment variations, with findings showing no direct proportionality between sedimentary Be-10/Be-9 ratios and cosmogenic Be-10 production rate. Climatic modulation and geomagnetic control during field reversals are important factors affecting Be-10/Be-9 ratios.
QUATERNARY SCIENCE REVIEWS
(2021)
Biographical-Item
Geography, Physical
Regis Braucher, Pierre-Henri Blard, Erik T. Brown, Julien Carcaillet, Anne-Elisabeth Lebatard, Lionel Siame, Quentin Simon, Nicolas Thouveny, Georges Aumaitre, Edouard Bard, Sebastien Carretier, Sophie Cornu, David Fink, Robert Finkel, Chris German, Vincent Godard, John Gosse, Bruno Hamelin, Felix Martin Hofmann, Vincent Jomelli, Karim Keddadouche, Mark D. Kurz, Ari Matmon, David Palacios, Chris Measures, Silke Merchel, Vincent Regard, Irene Schimmelpfennig, Friedhelm Von Blanckenburg, Swann Zerathe
QUATERNARY GEOCHRONOLOGY
(2021)
Article
Geochemistry & Geophysics
Quentin Simon, Nicolas Thouveny, Didier L. Bourles, Jean-Pierre Valet, Franck Bassinot
EARTH AND PLANETARY SCIENCE LETTERS
(2020)
Article
Geochemistry & Geophysics
Quentin Simon, Didier L. Bourles, Franck Bassinot, Sebastien Nomade, Maria Marino, Neri Ciaranfi, Angela Girone, Patrizia Maiorano, Nicolas Thouveny, Sandrine Choy, Fabien Dewilde, Vincent Scao, Gulay Isguder, Dominique Blamart
EARTH AND PLANETARY SCIENCE LETTERS
(2017)
Article
Geosciences, Multidisciplinary
Florence Sylvestre, Mathieu Schuster, Hendrik Vogel, Moussa Abdheramane, Daniel Ariztegui, Ulrich Salzmann, Antje Schwalb, Nicolas Waldmann
SCIENTIFIC DRILLING
(2018)
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)