Results 71 to 80 of about 34,086 (157)

Analysis of Paleointensity Results Under Different Interpretation Approaches: A Case Study on the Korkhi Volcanic Sequence (Lesser Caucasus, Georgia)

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract In this study we focus on the investigation of the absolute intensity records of two volcanic subsequences, aiming to enrich the global paleointensity database for the last 5 Ma, which currently shows important dispersion. We present new absolute paleointensities obtained from the Plio‐Pleistocene volcanic sequence of Korkhi (Djavakheti ...
Elisa M. Sánchez‐Moreno, Manuel Calvo‐Rathert, Avto Goguitchaichvili, George T. Vashakidze, Lisa Tauxe, Pierre Camps, Juan Morales‐Contreras, Vladimir A. Lebedev, Néstor Vegas, Nayeli Pérez‐Rodriguez, Ketino Gabarashvili   +10 more
wiley   +1 more source

Weak Crust Owing Past Magmatic Intrusions Beneath Campi Flegrei Identified: The Engine for Bradyseismic Movements?

AGU Advances, Volume 6, Issue 2, April 2025.
Abstract Calderas often experience extended periods of unrest that are challenging to relate to a magmatic or hydrothermal origin, making it crucial to assemble a clear picture of these dynamics. Since 2005, Campi Flegrei caldera (Italy) has experienced accelerating ground uplift, seismicity rates, and degassing.
Gianmarco Buono, Francesco Maccaferri, Lucia Pappalardo, Anna Tramelli, Stefano Caliro, Giovanni Chiodini, Virginie Pinel, Eleonora Rivalta, Elena Spagnuolo, Elisa Trasatti, Mauro Antonio Di Vito   +10 more
wiley   +1 more source

High Silica Leucogranites Result From Sedimentary Rock Melting—Evidence From Trace Elements and Nd‐Hf‐B Isotopes

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract High silica granites may host major rare metal deposits. The petrogenesis of these granites, some of which have very low Zr/Hf, Nb/Ta, and Eu/Eu* ratios, has been highly debated. The existing views mainly favor either extreme magmatic fractionation or fluid‐magma interaction.
Hui Huang, Yaoling Niu, Rolf L. Romer, Yuhuang Zhang, Maoyong He, Wei Li   +5 more
wiley   +1 more source

Redox‐State and Bioproductivity of the Glaciogenic Early Cryogenian Rapitan Iron Formation (Cranswick River, Canada): Constraints From Combined Cadmium—Chromium Isotopes

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract The Rapitan Group (Northwest Territories, Canada) includes banded iron formation (BIF), an unusual sediment type that is associated with late Neoproterozoic glaciations, in this case, the early Cryogenian Sturtian glaciation. New non‐traditional stable isotope data from jasper and hematite iron formation (IF) from the Cranswick River area ...
Robert Frei, Geoff Baldwin, Michael G. Babechuk, Balz S. Kamber, Elizabeth C. Turner   +4 more
wiley   +1 more source

Investigating the Lid Effect on the Generation of Ocean Island Basalts: 2. Geodynamical Simulations

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 4, April 2025.
Abstract The concept that oceanic lithosphere mechanically limits upwelling and decompression melting of mantle plumes is known as the lid effect and is backed up by observations of ocean island basalt (OIB) geochemistry. Nevertheless, in a recent companion study on OIB geochemistry, several additional factors were identified that further influence OIB
Shihao Jiang, Thomas Duvernay, Mark J. Hoggard, Rhys Hawkins, Ian H. Campbell, D. Rhodri Davies   +5 more
wiley   +1 more source

Magnetization of Oceanic Lithosphere From Modeling of Satellite Observations

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 4, April 2025.
Abstract Magnetic observations from the oceans have made fundamental contributions to our knowledge of plate motions and the evolution of the geomagnetic field over the past ∼200 Myr. Here we construct updated models of magnetization for the oceanic lithosphere, taking advantage of the most recent models for Earth's past plate motions. We then evaluate
Simon Williams, David Gubbins, Joanne Whittaker, Maria Seton   +3 more
wiley   +1 more source

Community‐Driven Code Comparisons for Simulations of Fluid‐Induced Aseismic Slip

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 4, April 2025.
Abstract Numerical simulations of Sequences of Earthquakes and Aseismic Slip (SEAS) have rapidly progressed to address fundamental problems in fault mechanics and provide self‐consistent, physics‐based frameworks to interpret and predict geophysical observations across spatial and temporal scales.
Valère R. Lambert, Brittany A. Erickson, Junle Jiang, Eric M. Dunham, Taeho Kim, Jean‐Paul Ampuero, Ryosuke Ando, Frédéric Cappa, Pierre Dublanchet, Ahmed Elbanna, Yuri Fialko, Alice‐Agnes Gabriel, Nadia Lapusta, Meng Li, Jasper Marcum, David May, Md Shumon Mia, So Ozawa, Casper Pranger, Pierre Romanet, Marco M. Scuderi, Ylona van Dinther, Yuyun Yang, Jeena Yun   +23 more
wiley   +1 more source

A Deep Dive Into a Ridge‐Transform Fault Intersection: Volcano‐Tectonic Relationships in an Enhanced Cold‐Edge Effect at the Romanche Fracture Zone

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 4, April 2025.
Abstract At mid‐ocean ridges, the mantle temperature and composition, and the lithosphere thickness control the melting conditions, which influence the feeding and structure of the neo‐volcanic areas. We present a study of the eastern intersection between the Romanche transform fault (TF) and the adjacent southward segments of the Mid‐Atlantic Ridge ...
Léa Grenet, Marcia Maia, Cédric Hamelin, Anne Briais, Hervé Guillou, Vincent Scao, Daniele Brunelli   +6 more
wiley   +1 more source

Paleomagnetic Secular Variation of Early Middle Miocene Volcanics From Vogelsberg (Germany)

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 4, April 2025.
Abstract The Earth's magnetic field significantly changed its rate of polarity reversals over the past 200 Myr; yet it remains controversial whether these drastic changes—from a stable state of polarity during the Cretaceous Normal Superchron to more than 10 events per Myr during the Jurassic—are accompanied with similar changes in the directional ...
Y. Chi, F. Lhuillier
wiley   +1 more source

Questioning the Reliability of Methane Detections on Mars by the Curiosity Rover

Journal of Geophysical Research: Planets, Volume 130, Issue 4, April 2025.
Abstract Over the past decade, the Tunable Laser Spectrometer (TLS) on NASA's Curiosity rover has reported several detections of methane on Mars, attracting attention due to the potential astrobiological implications of its presence. Here, we re‐analyze published TLS data, identifying issues in data robustness and reduction.
Sébastien Viscardy, David C. Catling, Kevin Zahnle   +2 more
wiley   +1 more source