Article
Geochemistry & Geophysics
Steve Lund, Gary Acton, Brad Clement, Makoto Okada, Lloyd Keigwin
Summary: The study presents important information on the paleomagnetic field variations during two specific periods based on PSV and excursion data obtained from ODP sites in the western North Atlantic. By correcting age estimates and comparing records, it reveals significant variability of the geomagnetic field at different timescales and characteristics of excursions, providing insights into the behavior of the magnetic field between reversals.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Richard K. Bono, Greig A. Paterson, Annique van der Boon, Yael A. Engbers, J. Michael Grappone, Benjamin Handford, Louise M. A. Hawkins, Simon J. Lloyd, Courtney J. Sprain, Daniele Thallner, Andrew J. Biggin
Summary: The updated PINT database provides crucial constraints on the evolution of Earth's deep interior and its magnetic environment, with a trend towards increasing quality of data in studies published after the year 2000. The spatio-temporal distribution analysis reveals biases towards young records in the Northern hemisphere and intervals with little to no data in the Palaeozoic and Precambrian.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Louise M. Hawkins, Andrew J. Biggin, Yebo Liu, J. Michael Grappone, Zheng-Xiang Li
Summary: Precambrian palaeointensity measurements provide fundamental constraints on the evolution of the deep Earth. New results from the Yandinilling dyke swarm suggest that the dipole moment during this time period was considerably lower than today's value, but similar to the long-term average. These findings also suggest that the geodynamo was more stable on average during the Archaean-Proterozoic transition.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Gillian M. Turner, Ruth M. Corkill
Summary: The southwest Pacific region is under-represented in palaeomagnetic secular variation databases, but reliable data from this region are crucial for constructing global models and master records for dating purposes. The NZPSV11k and NZPSV1k records provide valuable insights into the palaeomagnetic and archaeomagnetic variations in the region. The records show significant differences from global models, highlighting the importance of incorporating data from the region.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2023)
Article
Geochemistry & Geophysics
B. Eid, F. Lhuillier, V. P. Shcherbakov, V. V. Shcherbakova
Summary: This study provides new absolute and relative paleointensity data from a basaltic sequence in Ethiopia, finding no robust correlation between changes in dipole moment and reversal frequency over the past 155 million years. However, the results are consistent with the predicted paleosecular-variation proxy trend from numerical dynamo simulations.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
E. Tema, Y. Santos, R. Trindade, G. A. Hartmann, T. Hatakeyama, F. Terra-Nova, N. Matsumoto, J. Mitsumoto, M. Gulmini
Summary: This study presents new absolute archaeointensity data from six archaeological sites in the Okayama Prefecture, Japan. The findings suggest the presence of a possible recurrence of weak geomagnetic intensity field in East Asia during the Late Yayoi period and a very weak geomagnetic intensity field around 630 AD. The new data might change the interpretations of archaeomagnetic field models in the area, although more data are still needed to fully understand the secular variation in Japan and the temporal evolution of the geomagnetic field's behavior in East Asia.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geology
Ruth M. Corkill, Gillian M. Turner
Summary: The paleomagnetic records of three lake sediment cores in northern New Zealand have been merged to produce a new Holocene geomagnetic secular variation record. These records were correlated using tephra and magnetic susceptibility variations, showing well-defined swings in magnetic direction at different time periods. The regional nature of geomagnetic secular variation is indicated by its agreement with records from Mavora Lakes, 1000 km further south.
NEW ZEALAND JOURNAL OF GEOLOGY AND GEOPHYSICS
(2022)
Article
Geosciences, Multidisciplinary
Simon Lloyd, Andy Biggin, Mimi Hill, Lennart De Groot, Neil Suttie, Joseph Morris, Harald Boehnel, John Shaw
Summary: The Microwave Palaeointensity System at the University of Liverpool has developed into the current third generation version which integrates a 14 GHz microwave resonant cavity and superconducting quantum interference device magnetometer. The system uses microwave energy to minimize the bulk temperatures required for demagnetization and remagnetization of palaeomagnetic material, reducing the problem of thermo-chemical alteration of magnetic minerals. The system has been shown to provide accurate absolute palaeointensities and can be used in a multi-method approach for a wide range of materials.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geography, Physical
Megan L. Allington, Andreas Nilsson, Mimi J. Hill, Neil Suttie, Dimitra Daniil, Ingeborg Hjorth, Linda Aulin, Paul C. Augustinus, Phil Shane
Summary: Understanding the eruption history of the volcanoes in the Auckland Volcanic Field is crucial for assessing future hazards in Auckland. Using palaeomagnetic methods, researchers discovered that Rangitoto volcano's construction phase likely lasted 150-450 years, contradicting previous estimates of less than 100 years. This finding has important implications for the timing and potential impact of future eruptions in the Auckland Volcanic Field.
QUATERNARY GEOCHRONOLOGY
(2023)
Article
Geosciences, Multidisciplinary
S. Sharan, B. Langlais, H. Amit, E. Thebault, M. Pinceloup, O. Verhoeven
Summary: Unique information about the dynamo process acting at Jupiter is obtained through modeling and interpreting its magnetic field. By analyzing the fluxgate magnetometer measurements from the Juno mission, a magnetic field model is derived that accurately describes both the main field and the secular variation up to high spherical harmonic degrees. The analysis reveals similarities between Jupiter's magnetic field and Earth's, suggesting dominance of advection and presence of zonal and non-zonal deep fluid motions.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
A. N. Mahgoub, B. Garcia-Amador, L. M. Alva-Valdivia
Summary: This study reports paleomagnetic directions and intensity values obtained from 27 sites in the Baja California Peninsula, northwestern Mexico. The results show weak geomagnetic field during the middle-late Miocene compared to the Pliocene period, suggesting a global nature of low dipole moment during that time.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Shuhui Cai, Rashida Doctor, Lisa Tauxe, Mitch Hendrickson, Quan Hua, Stephanie Leroy, Kaseka Phon
Summary: The study conducted geomagnetic research at the Tonle Bak site in Cambodia, recovering geomagnetic information from the 11th to 14th centuries. It revealed a sharp change in the geomagnetic field between 1200 and 1300 CE, providing evidence for the possible existence of low-latitude flux expulsion. The study suggests a new focus on detailed geomagnetic research in low-latitude areas around the equator and exploration of related dynamic processes.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Magnus D. Hammer, Christopher C. Finlay, Nils Olsen
Summary: In this study, local time-series of the magnetic field gradient tensor elements at satellite altitude were derived using a Geomagnetic Virtual Observatory (GVO) approach. The derived gradient element time-series allow for global investigations of spatio-temporal variations in the gradient tensor elements. Evidence for a regional increase event in 2017 was found based on the first time derivative of the gradient tensor elements.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geography, Physical
Venera Dobrica, Cristiana Stefan, Crisan Demetrescu
Summary: This study examined the Earth's surface magnetic field and its secular variation, focusing on the internal constituents and dynamics of the SV foci. By analyzing long time-span geomagnetic models and applying filtering techniques, the study revealed new features of the Earth's surface field evolution, such as the westward drift of the inter-centennial constituent and the westward drift of higher frequency constituents in the equatorial band.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Oceanography
Steve Lund, Makoto Okada, Emily Mortazavi
Summary: This study develops composite full-vector paleomagnetic secular variation (PSV) records from IODP Ex. 323 Sites U1339, U1343, U1344, and U1345 in the Bering Sea. These PSV records cover the last 71 ka (Marine Isotope Stages (MIS) 1-4) and provide important insights into the magnetic field behavior at high latitudes.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2023)
Article
Geochemistry & Geophysics
S. Panovska, C. G. Constable
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2017)
Article
Multidisciplinary Sciences
Christopher Davies, Catherine Constable
NATURE COMMUNICATIONS
(2017)
Article
Geochemistry & Geophysics
S. Panovska, C. G. Constable, M. C. Brown
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2018)
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Geochemistry & Geophysics
G. Cromwell, C. L. Johnson, L. Tauxe, C. G. Constable, N. A. Jarboe
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2018)
Article
Geochemistry & Geophysics
Andrew Jackson, Robert L. Parker, Malcolm Sambridge, Catherine Constable, Aaron S. Wolf
AMERICAN MINERALOGIST
(2018)
Article
Geochemistry & Geophysics
Christopher J. Davies, Catherine G. Constable
EARTH AND PLANETARY SCIENCE LETTERS
(2018)
Article
Geochemistry & Geophysics
S. Panovska, C. G. Constable, M. Korte
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2018)
Article
Geochemistry & Geophysics
Margaret S. Avery, Catherine G. Constable, Christopher J. Davies, David Gubbins
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2019)
Review
Geography, Physical
Monika Korte, Maxwell C. Brown, Sydney R. Gunnarson, Andreas Nilsson, Sanja Panovska, Ingo Wardinski, Catherine G. Constable
QUATERNARY GEOCHRONOLOGY
(2019)
Article
Geochemistry & Geophysics
Daniele Brandt, Marcia Ernesto, Catherine Constable, Daniel Ribeiro Franco, Luiz Carlos Weinschutz, Pillar de Oliveira Carvalho Rodrigues, Linda Hinnov, Plinio Jaqueto, Becky E. Strauss, Joshua Feinberg, Pedro Vitor de Paiva Franco, Xixi Zhao
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Review
Geochemistry & Geophysics
S. Panovska, M. Korte, C. G. Constable
REVIEWS OF GEOPHYSICS
(2019)
Article
Geochemistry & Geophysics
Daniele Brandt, Catherine Constable, Marcia Ernesto
GEOPHYSICAL JOURNAL INTERNATIONAL
(2020)
Article
Multidisciplinary Sciences
Christopher J. Davies, Catherine G. Constable
NATURE COMMUNICATIONS
(2020)
Article
Geochemistry & Geophysics
Daniele Brandt, Marcia Ernesto, Catherine Constable
Summary: This study presents an extensive directional paleomagnetic database of the Kiaman reversed superchron, with a constant behavior of concentrated and circular distributions at latitudes higher than 10 degrees. Through Giant Gaussian Process (GGP) models, the research found a covariant type that best explains the directional distribution of the Kiaman database. The results suggest that the correlations between Gaussian coefficients are valid for the last 10 Myr and the Kiaman superchron, and that the relative variability of the Kiaman field is lower compared to the past 10 Myr.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Article
Geochemistry & Geophysics
Margaret S. Avery, Jeffrey S. Gee, Catherine G. Constable
EARTH AND PLANETARY SCIENCE LETTERS
(2017)