Results 131 to 140 of about 39,453 (210)

Evidence for an Exceptionally Weak Cambrian Geomagnetic Field: New Paleointensity Estimates From the Florida Mountains, New Mexico

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract The timing of the formation of the Earth's inner core remains a major mystery in the history of Earth's deep interior, with estimates ranging from >1 billion years to <500 million years. Inner core nucleation is expected to be characterized in the paleomagnetic record by a drop in magnetic field strength prior to inner core nucleation ...
J. Michael Grappone, Annique van der Boon, Roger R. Fu, Andrew J. Biggin   +3 more
wiley   +1 more source

Performance of the 3F4M Noblesse–HR Noble Gas Mass Spectrometer for Multicollection Ne‐Ar‐N2 Analyses

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract The Noblesse–HR noble gas mass spectrometer was designed for multicollection analyses of different sets of noble gas isotopes with a fixed detector array under static conditions. At the Centre de Recherches Pétrographiques et Géochimiques (CRPG, Nancy, France), we developed a novel procedure to measure nitrogen (N2) abundance and isotope ratio
L. Zimmermann, E. Füri, J. Boulliung, J. M. Saxton   +3 more
wiley   +1 more source

Capturing Vegetation Gradients Along the West African Margin Using Terrestrial Plant Biomarkers in Marine Sediments

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract Understanding the transport mechanisms of terrestrial biomarkers to marine sediments is critical for interpreting past environmental and climate changes from these valuable archives. Here, we produce new estimates of two classes of terrestrial plant biomarkers, n‐alkane waxes and pentacyclic triterpene methyl ethers (PTMEs), from a transect of
Nicholas A. O’Mara, Peter B. de Menocal, Kevin T. Uno, Jessica E. Tierney, Gisela Winckler, Pratigya J. Polissar   +5 more
wiley   +1 more source

Late Cretaceous Extensional Collapse Driven by Delamination in Central Tibet Prior to India‐Asia Collision

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract A diverse range of dikes in the western Lhasa–Qiangtang collision zone provides constraints on the evolution of post‐collisional tectonomagmatic processes and the growth of the Tibetan Plateau. We report geochronological, geochemical, and Sr–Nd–Hf isotopic data for granitic dikes in the Rebang area of the Northern Lhasa Block, northern Tibet ...
Yao Xiao, Xi Jun Liu, Hao Wu, Min Liu, Hai Yong Liu, Yu Jia Song, Fei Liu   +6 more
wiley   +1 more source

The Tectonic Responses in the Overriding Plate During the Tethyan Convergence and the Progressive Extrusion Process in Sundaland: Insights From the Wuliangshan Massif, SE Tibetan Plateau

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 7, July 2025.
Abstract The overriding plate commonly accumulates less strain than the subducted plate during continental collision. Analyzing plate interactions from the perspective of the overriding plate provides important insights into orogenic dynamics. In the southeastern Tibetan Plateau, the Wuliangshan massif, as a key region of the overriding plate, records ...
Qinying Wu, Wei Lin, Lingtong Meng, Yin Wang, Fei Liu, Yang Chu, Wei Wei, Michel Faure, Vuong Van Nguyen, Hoai Luong Thi Thu, Chao Song, Zhao Guo   +11 more
wiley   +1 more source

Predictions for the Shape and Orientation of Earth's Foreshock Radiation Sources

Journal of Geophysical Research: Space Physics, Volume 130, Issue 7, July 2025.
Abstract Radio emission produced in Earth's foreshock is due to the bow shock reflecting some electrons back upstream into the foreshock, where they produce Langmuir waves and radio emissions near the electron plasma frequency fp ${f}_{p}$ and near 2fp $2{f}_{p}$.
Iver H. Cairns, Patrick Oppel
wiley   +1 more source

The Experimental Rate Constant of the <i>S</i> ⁺(² <i>D</i>) + <i>H</i> ₂ Reaction. [PDF]

ACS Earth Space Chem
Zanchet A, Chen-Qiu JL, Larregaray P, Bonnet L, Romanzin C, Solem N, Thissen R, Alcaraz C.   +7 more
europepmc   +1 more source

Imprints of Intense Geomagnetic Storm on Very Low Frequency (VLF) Radio Waves Over the Mediterranean Region

Journal of Geophysical Research: Space Physics, Volume 130, Issue 7, July 2025.
Abstract The study of solar and geomagnetic activity effects on the D‐region ionosphere (60–90 km altitude) using signals from very low frequency and low frequency (VLF, 3–30 kHz) transmitters has garnered considerable attention over the past decades. This research investigates the impacts of the geomagnetic storm (GMS) of 23–24 March 2023, utilizing ...
Muyiwa P. Ajakaiye, Ben Romano, Yuval Reuveni   +2 more
wiley   +1 more source

Stellar occultations: a gateway to advances in planetary science. [PDF]

Philos Trans A Math Phys Eng Sci
Souami D, Sfair R, Renner S, El Moutamid M.   +3 more
europepmc   +1 more source

Investigating Magnetic Field Fluctuations in Jovian Auroral Electron Beams

Journal of Geophysical Research: Space Physics, Volume 130, Issue 7, July 2025.
Abstract The Juno spacecraft provides a unique opportunity to explore the mechanisms generating Jupiter's aurorae. Past analyses of Juno data immensely advanced our understanding of its auroral acceleration processes, however, few studies utilized multiple instruments on Juno in a joint systematic analysis.
A. Salveter, J. Saur, G. Clark, A. Sulaiman, B. H. Mauk, J. E. P. Connerney, B. Bonfond   +6 more
wiley   +1 more source