A paleointensity test of the Geocentric Axial Dipole (GAD) hypothesis

Show simple item record

dc.contributor.author Veikkolainen, Toni Henri Kristian
dc.contributor.author Heimpel, Moritz
dc.contributor.author Evans, Michael E.
dc.contributor.author Pesonen, Lauri
dc.contributor.author Korhonen, Kimmo
dc.date.accessioned 2020-01-09T12:23:02Z
dc.date.available 2020-01-09T12:23:02Z
dc.date.issued 2017-04
dc.identifier.citation Veikkolainen , T H K , Heimpel , M , Evans , M E , Pesonen , L & Korhonen , K 2017 , ' A paleointensity test of the Geocentric Axial Dipole (GAD) hypothesis ' , Physics of the Earth and Planetary Interiors , vol. 265 , pp. 54-61 . https://doi.org/10.1016/j.pepi.2017.02.008
dc.identifier.other PURE: 80274294
dc.identifier.other PURE UUID: 85ee0d44-9bf4-4416-8b5a-4e15677cfd69
dc.identifier.other WOS: 000397695000006
dc.identifier.other Scopus: 85013827978
dc.identifier.other ORCID: /0000-0001-7410-4193/work/43412676
dc.identifier.other ORCID: /0000-0003-2740-6185/work/31743065
dc.identifier.uri http://hdl.handle.net/10138/309174
dc.description.abstract The Geocentric Axial Dipole (GAD) model is central to many aspects of geophysics, including plate tectonics and paleoclimate. But its validity is by no means firmly established, particularly for the Precambrian. One test that has met with some success involves the distribution of paleomagnetic inclination angles. It works because any given field morphology has its own distinct probability distribution function (PDF) against which data compilations can be tested. Here, we investigate a second possible test using published paleointensity data. Once again, any given field morphology has a specific PDF of intensity. Likely field models consist of an underlying GAD on which is superimposed modest zonal quadrupole and octupole components. The corresponding paleointensity PDFs turn out to have more complicated shapes than their inclination counterparts, often having multiple maxima and minima. Given sufficient data, this complexity offers greater discrimination between models. In this paper, the potential of the paleointensity test is assessed using an extension of the PINT paleointensity database. We found it useful to analyze the Phanerozoic and Precambrian intervals separately. Despite the inherent limitations of this kind of analysis, a tripartite geodynamo with small zonal multipoles appears to be a good starting point on a way towards more fine-tuned models. fi
dc.description.abstract The Geocentric Axial Dipole (GAD) model is central to many aspects of geophysics, including plate tectonics and paleoclimate. But its validity is by no means firmly established, particularly for the Precambrian. One test that has met with some success involves the distribution of paleomagnetic inclination angles. It works because any given field morphology has its own distinct probability distribution function (PDF) against which data compilations can be tested. Here, we investigate a second possible test using published paleointensity data. Once again, any given field morphology has a specific PDF of intensity. Likely field models consist of an underlying GAD on which is superimposed modest zonal quadrupole and octupole components. The corresponding paleointensity PDFs turn out to have more complicated shapes than their inclination counterparts, often having multiple maxima and minima. Given sufficient data, this complexity offers greater discrimination between models. In this paper, the potential of the paleointensity test is assessed using an extension of the PINT paleointensity database. We found it useful to analyze the Phanerozoic and Precambrian intervals separately. Despite the inherent limitations of this kind of analysis, a tripartite geodynamo with small zonal multipoles appears to be a good starting point on a way towards more fine-tuned models. en
dc.format.extent 8
dc.language.iso eng
dc.relation.ispartof Physics of the Earth and Planetary Interiors
dc.rights cc_by_nc_nd
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 114 Physical sciences
dc.title A paleointensity test of the Geocentric Axial Dipole (GAD) hypothesis en
dc.type Article
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1016/j.pepi.2017.02.008
dc.relation.issn 0031-9201
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion

Files in this item

Total number of downloads: Loading...

Files Size Format View
A_paleointensit ... _dipole_GAD_hypothesis.pdf 926.9Kb PDF View/Open

This item appears in the following Collection(s)

Show simple item record