Results 71 to 80 of about 1,861 (213)

Snapshot of the Matuyama‐Brunhes reversal process recorded in 40Ar/39Ar‐dated lavas from Guadeloupe, West Indies

Geochemistry, Geophysics, Geosystems, 2013
We obtain new 40Ar/39Ar ages for three lavas that record part of the Matuyama‐Brunhes geomagnetic field reversal process on Guadeloupe. These lavas record a reversed‐transitional‐reversed magnetostratigraphy and yield a weighted mean isochron age of 785 ...
M. C. Brown, B. R. Jicha, B. S. Singer, J. Shaw   +3 more
doaj   +1 more source

Brunhes Paleomagnetic Directions and Paleointensities From Northern Hainan Island

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 1, January 2026.
Abstract Paleomagnetic studies typically assume that the long‐term, time‐averaged geomagnetic field behaves as a geocentric axial dipole (GAD). While paleodirectional data over the past five million years generally agree with GAD predictions, mid‐to‐low latitude paleointensity records fail to show GAD, with high values from Hawaii.
Mengqing Wang, Huapei Wang, Huafeng Qin, Jian Luo, Chen Wen, Fei Han, Yiming Ma, Jiabo Liu   +7 more
wiley   +1 more source

Source of oceanic magnetic anomalies and the geomagnetic polarity time scale [PDF]

, 2007
Marine magnetic anomalies provide the framework for the geomagnetic polarity timescale for the Late Jurassic to Recent (since 160 Ma). Magnetostratigraphic records confirm that the polarity reversal sequence interpreted from magnetic anomalies is ...
Acton, Agrinier, Allerton, Allerton, Anonymous, Atwater, Banerjee, Bazin, Berggren, Beske-Diehl, Billups, Blakely, Blakely, Blakely, Bleil, Bohnenstiehl, Bosum, Bowers, Bowles, Bowles, Bowles, Cande, Cande, Cande, Cande, Cande, Cande, Cande, Cande, Cande, Cande, Cannat, Cannat, Cannat, Carbotte, Carlut, Carlut, Channell, Channell, Channell, Christeson, Clement, Cogné, Cogné, Cox, Cox, Cronin, Day, Detrick, Detrick, Dick, Dick, Dick, Doubrovine, Dyment, Dyment, Evans, Evans, Facey, Fornari, Francheteau, Früh-Green, Furuta, Furuta, Furuta, Gallet, Garces, Gee, Gee, Gee, Gee, Gee, Gee, Gee, Gee, Gee, Gee, Gillis, Gradstein, Grommé, Guyodo, Hall, Handschumacher, Harding, Harrison, Hartl, Heirtzler, Helsley, Hilgen, Hooft, Horner-Johnson, Hurst, Hussenoeder, Irving, Irving, Jackson, John, Johnson, Johnson, Johnson, Johnson, Johnson, Johnson, Juarez, Juarez, Juster, Karson, Kelemen, Kelso, Kent, Kent, Kent, Kidd, Kikawa, Kikawa, Kinoshita, Klitgord, Korenaga, Korte, Krasa, Krijgsman, Kriner, Lancelot, Lanci, Lanci, Lanci, Larson, Larson, Larson, Larson, Larson, Lawrence, Levi, Levi, Lewis, Lourens, Lowrie, Lowrie, Lowrie, Macdonald, Macdonald, Marshall, Marshall, Matzka, McElhinny, McFadden, McFadden, Mejia, Merrill, Miller, Nakanishi, Nakanishi, Nakanishi, Natland, Nazarova, Nazarova, Ogg, Oufi, Oxburgh, O’Reilly, Pariso, Pariso, Pariso, Pariso, Pariso, Pariso, Pariso, Parker, Pechersky, Pechersky, Perfit, Perfit, Perram, Petronotis, Pettigrew, Pick, Pick, Pitman, Pitman, Plank, Pockalny, Pockalny, Prévot, Raymond, Renne, Roberts, Robinson, Roeser, Roest, Roperch, Ryall, Sager, Sayanagi, Schneider, Schneider, Schouten, Schouten, Schouten, Schouten, Schouten, Sclater, Seama, Selkin, Selkin, Sempere, Shackleton, Shackleton, Shah, Shau, Sinton, Sinton, Smith, Smith, Smith, Smith, Speranza, Stein, Steiner, Swift, Talwani, Tarduno, Tauxe, Tauxe, Tauxe, Tivey, Tivey, Tivey, Tivey, Tivey, Tivey, Tivey, Tivey, Tivey, Tivey, Toft, Varga, Vera, Verosub, Vine, Vine, Vine, Vogt, Wallick, Wang, Wang, Weissel, Wilson, Wilson, Wilson, Wilson, Wittpenn, Worm, Worm, Worm, Xu, Xu, Xu, Xu, Yamamoto, Yang, Zhou, Zhou, Zhou, Zhou, Özdemir   +264 more
core   +2 more sources

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

GEOMAGIA50.v3: 1. general structure and modifications to the archeological and volcanic database [PDF]

, 2015
Background: GEOMAGIA50.v3 is a comprehensive online database providing access to published paleomagnetic, rock magnetic, and chronological data from a variety of materials that record Earth’s magnetic field over the past 50 ka.Findings: Since its ...
Brown, Maxwell C, Constable, Catherine G, Donadini, Fabio, Korhonen, Kimmo, Korte, Monika, Lengyel, Stacey N, Lodge, Alexandra, Nilsson, Andreas   +7 more
core   +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

Prebiotic Organic Microstructures [PDF]

, 2011
Micro- and sub-micrometer spheres, tubules and fiber-filament soft structures have been synthesized in our experiments conducted with 3 MeV proton irradiations of a mixture of simple inorganic constituents, CO, N2 and H2O.
A Yoshihara, AM Hessler, CJ Hale, DI Foustoukos, F Klein, H Kurihara, J Takahashi, K Kobayashi, K Kobayashi, K Kobayashi, K Kobayashi, K Kvenvolden, Kensei Kobayashi, M Yoshizaki, Marie-Paule Bassez, MP Bassez, MP Bassez, O Botta, S Miyakawa, SL Seewald, T McCollom, T McCollom, Y Takano, Y Takano, Y Takano, Y Takano, Yoshinori Takano   +26 more
core   +2 more sources

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

Climatic influence in NRM and 10 Be-derived geomagnetic paleointensity data [PDF]

, 1999
One can determine geomagnetic paleointensities from natural remanent magnetizations (NRM) and by inverting production rates of cosmogenic isotopes such as 10 Be and 14 C. Recently, two independently derived 200-kyr stacks [Y. Guyodo, J.-P.
Yvo S. Kok
core   +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