Results 1 to 10 of about 181 (155)

A Global Paleosecular Variation Database for the Paleogene: Stationary Secular Variation Behavior Since the Triassic?

Geochemistry, Geophysics, Geosystems
Paleosecular variation analysis is a primary tool for characterizing ancient geomagnetic behavior and its evolution through time. This study presents a new high‐quality directional data set, paleosecular variation of the Paleogene (PSVP), with and ...
Y. A. Engbers, D. Thallner, R. K. Bono, C. J. Sprain, M. J. Murray, K. Bristol, B. Handford, T. Torsvik, A. J. Biggin   +8 more
doaj   +4 more sources

Paleosecular Variation Constraints on Geomagnetic Field Morphology at ca. 1100 Ma

Geophysical Research Letters
Paleosecular variation provides a statistical test of long‐term geomagnetic field morphology, but its behavior across Precambrian polarity regimes remains poorly constrained. We compile a virtual geomagnetic pole dispersion data set spanning 1130–1070 Ma
Hanqing Zhao, Shihong Zhang, Jikai Ding, Qiang Ren, Haiyan Li, Weiwei Bian, Tianshui Yang, Huaichun Wu   +7 more
doaj   +3 more sources

Paleosecular Variation and the Time‐Averaged Geomagnetic Field Since 10 Ma [PDF]

Geochemistry, Geophysics, Geosystems, 2021
Investigations into long‐term geomagnetic variations provide useful information regarding paleomagnetic field behavior. In this study, we assess the latitudinal structure of paleosecular variation (PSV) and the time‐averaged field (TAF) for the Brunhes ...
Wellington P. deOliveira, Gelvam A. Hartmann, Filipe Terra‐Nova, Daniele Brandt, Andrew J. Biggin, Yael A. Engbers, Richard K. Bono, Jairo F. Savian, Daniel R. Franco, Ricardo I. F. Trindade, Thiago R. Moncinhatto   +10 more
doaj   +4 more sources

PSVM: A Global Database for the Miocene Indicating Elevated Paleosecular Variation Relative to the Last 10 Myrs

Geochemistry, Geophysics, Geosystems, 2022
Statistical studies of paleosecular variation (PSV) are used to infer the structure and behavior of the geomagnetic field. This study presents a new database, paleosecular variation of the Miocene (PSVM), of high‐quality directional data from the Miocene
Y. A. Engbers, R. K. Bono, A. J. Biggin
doaj   +2 more sources

Paleomagnetic techniques can date speleothems with high concentrations of detrital material [PDF]

Scientific Reports, 2022
The U-series dating of young and ‘dirty’ speleothems is challenging due to difficulties in assessing the isotopic composition of detrital contaminants and the low-abundance of 230Th generated in situ.
Elisa M. Sánchez-Moreno, Eric Font, F. Javier Pavón-Carrasco, Luca A. Dimuccio, Claude Hillaire-Marcel, Bassam Ghaleb, Lúcio Cunha   +6 more
doaj   +2 more sources

Geophysical insights from the first geomagnetic field absolute intensity curve for central Asia (2200BCE–2000CE), and implications for archaeomagnetic dating [PDF]

Scientific Reports
Until now, the lack of high-quality paleointensity data has left Central Asia as a major gap in global and regional reconstructions of geomagnetic field intensity variations.
R. Bonilla-Alba, M. Gómez-Paccard, F. J. Pavón-Carrasco, A. Chauvin, E. Beamud, V. Martínez-Ferreras, J. M. Gurt-Esparraguera, E. Luneau, M. L. Osete   +8 more
doaj   +2 more sources

Analyzing Triassic and Permian Geomagnetic Paleosecular Variation and the Implications for Ancient Field Morphology

Geochemistry, Geophysics, Geosystems, 2021
Studying paleosecular variation (PSV) can provide unique insights into the average morphology of the geomagnetic field and the operation of the geodynamo.
B. T. Handford, A. J. Biggin, M. M. Haldan, C. G. Langereis   +3 more
doaj   +2 more sources

Long-term persistency of a strong non-dipole field in the South Atlantic [PDF]

Nature Communications
Earth’s magnetic field exhibits a dominant dipole morphology. Notwithstanding, significant deviations from the dipole are evident today, particularly the South Atlantic Anomaly (SAA), characterized by anomalously low-field intensity and high directional ...
Wellington P. de Oliveira, Gelvam A. Hartmann, Filipe Terra-Nova, Natália G. Pasqualon, Jairo F. Savian, Evandro F. Lima, Fernando R. da Luz, Ricardo I. F. Trindade   +7 more
doaj   +2 more sources

Speleothems as Magnetic Archives: Paleosecular Variation and a Relative Paleointensity Record From a Portuguese Speleothem

Geochemistry, Geophysics, Geosystems, 2018
We provide a high‐resolution and complete paleomagnetic study from a middle‐Holocene (~4,100–3,300 years Before Common Era, BCE) dome‐shaped speleothem (SPAIV) from Algarve, Portugal.
J. M. Ponte, E. Font, C. Veiga‐Pires, C. Hillaire‐Marcel   +3 more
doaj   +2 more sources

The importance of clays in speleothem magnetic remanence acquisition [PDF]

Scientific Reports
Speleothems are promising recorders of paleosecular variation of the Earth’s magnetic field, but ambiguities remain about the physical processes active during remanence acquisition.
Rashida Doctor, Joshua M. Feinberg, Plinio Jaqueto, Ricardo Trindade, Janine A. Carmo   +4 more
doaj   +2 more sources