Results 31 to 40 of about 188 (119)

Paleointensity of the ancient Martian magnetic field [PDF]

Geophysical Research Letters, 2008
Mars today has no core dynamo magnetic field. However, the discovery of remanent magnetization in Martian meteorites and intense crustal magnetization suggests that Mars once had a global field. Here we present high resolution maps of the magnetic field of Martian meteorite ALH 84001.
Benjamin P. Weiss, Luis E. Fong, Hojatollah Vali, Eduardo A. Lima, Franz J. Baudenbacher   +4 more
openaire   +1 more source

Increasing the Accuracy and Efficiency of Micromagnetic Tomography by Double Sided Scanning

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 1, January 2026.
Abstract Paleomagnetic data are usually retrieved by subjecting bulk samples, for example lavas, to laboratory measurement protocols. In many instances, the data related to these protocols yield uninterpretable results caused by the presence of particles with adverse magnetic properties that blur the signal of the reliable magnetic particles.
Frenk Out, Rosa A. de Boer, Martha E. Kosters, Bertwin M. de Groot, Lennart V. de Groot   +4 more
wiley   +1 more source

Geomagnetic Variability in a Post‐Superchron Geodynamo: Insights From the Deccan Traps

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 1, January 2026.
Abstract Studying long‐term geomagnetic field behavior is crucial for understanding Earth's evolution, as field variability reflects processes in the planet's deep interior. One key question concerns the relationship between field strength and polarity reversal frequency, particularly during the Cretaceous Normal Superchron (CNS), a prolonged interval ...
K. E. Bristol, C. J. Sprain, T. Mittal, A. Monteiro, R. Duraiswami, M. M. Tremblay, M. Mijjum   +6 more
wiley   +1 more source

A >70‐Myr‐Long Geomagnetic Field Reversal Hyperactivity Across the Ediacaran‐Cambrian Transition

Geophysical Research Letters, Volume 52, Issue 23, 16 December 2025.
Abstract The long‐term variation of the geomagnetic field is a key constraint for unraveling the geodynamo processes and the evolution of Earth's deep interior. However, the geomagnetic reversal pattern during the Ediacaran–Cambrian transition remains elusive. Here we present an integrated magneto‐ and cyclo‐stratigraphic study of a ∼1.8‐Myr‐long, late
Fuyun Shen, Bin Wen, Phil J. A. McCausland, Zheng Gong, Zongmin Zhu, Fangzheng Liu, Jingyi Wang   +6 more
wiley   +1 more source

Facies Characterization and Volcanic Source Assignment of Marine Tephra Deposits Around São Miguel Island, Azores Archipelago

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 12, December 2025.
Abstract Long‐term tephrostratigraphies of volcanic islands such as the Azores are often limited to young and incomplete subaerial records. Here, we present a Pleistocene‐Holocene marine tephra archive around the eastern islands of the Azores based on 22 marine gravity cores.
J. C. Schindlbeck‐Belo, M. Andrade, J. Kling, S. Kutterolf, A. Pimentel, E. Lebas, A. Freundt, K. Pank, T. H. Hansteen   +8 more
wiley   +1 more source

Paleointensity Estimates from Italian Kilns

Journal of geomagnetism and geoelectricity, 1986
Paleointensity estimates from three archeological sites are reported; field magnitudes (F) of 71.3±3.7μT and 75.3±1.2μT are obtained from two 1st century A. D. kilns, whilst a 3rd century B. C. kiln yields F=79.7±1.3μT. The present geomagnetic field in the area has a magnitude of 44.7μT.
openaire   +2 more sources

Evolution of Terrestrial Planetary Bodies and Implications for Habitability

Reviews of Geophysics, Volume 63, Issue 4, December 2025.
Abstract The terrestrial planetary bodies of our solar system—Mercury, Venus, Earth, and Mars—share a common origin through nebular accretion and early magma ocean differentiation, yet they diverged significantly in geological evolution, tectonic regimes, and habitability.
Peter A. Cawood, Eva E. Stüeken, Priyadarshi Chowdhury, Chris J. Hawkesworth, Jacob A. Mulder   +4 more
wiley   +1 more source

Magnetic Stability of Magnetite Particles With Single Vortex Structure During Low‐Temperature Oxidation

Geophysical Research Letters, Volume 52, Issue 22, 28 November 2025.
Abstract To characterize the magnetic stability of paleomagnetically important single vortex (SV) particles, we systematically studied three synthetic magnetite samples with mean sizes of 79, 299, and 685 nm all within the SV size range. We examined the rock magnetic properties of these samples during low‐temperature oxidation both from experimental ...
Kunpeng Ge, Wyn Williams, Qingsong Liu, Juzhi Deng, Yanguo Wang, Qing Ji, Shuzhong Sheng, Lesleis Nagy, Hui Zhou, Junling Pei   +9 more
wiley   +1 more source

Moderate Thermal Conductivity of Fe‐Ni‐Si Alloy at Earth's Core Conditions: Implications for Core Thermal Evolution and Geodynamo

Geophysical Research Letters, Volume 52, Issue 21, 16 November 2025.
Abstract Earth's presently‐active magnetic field is thought to be generated by geodynamo via convection of liquid outer core, primarily composed of Fe alloyed with Ni and light elements, for example, Si. Core thermal conductivity critically controls its thermal evolution, dynamics, and available energy (thermal vs. compositional) powering the geodynamo
Wen‐Pin Hsieh, Yi‐Ting Chiang, Frédéric Deschamps, Chao‐Chih Chen, Jen‐Wei Chang, Daijo Ikuta, Eiji Ohtani   +6 more
wiley   +1 more source

New Insights Into the Proposed Geomagnetic Excursion Hilina Pali From High‐Resolution Lake Sediment Cores From the Polar Ural Mountains, Arctic Russia

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 11, November 2025.
Abstract This study presents paleomagnetic records from three 24 m‐long sediment cores from the neighboring lakes Bolshoye Shchuch'ye and Maloye Shchuch'ye, located about 10 km apart in the Polar Urals in northern Russia. The age model, based on radiocarbon dating and varve counting, shows that the sediment sequences reach back up to about 23.5 ka cal.
S. Scheidt, S. Ólafsdóttir, J. Brendryen, N. R. Nowaczyk, M. M. Lenz, J. I. Svendsen, H. Haflidason   +6 more
wiley   +1 more source