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A 2.14-Myr astronomically tuned record of relative geomagnetic paleointensity from the western Philippine Sea

Horng, Chorng-Shern; Roberts, Andrew P.; Liang, Wen-Tzong

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We present a 2.14-Myr astronomically tuned relative geomagnetic paleointensity record from the western Philippine Sea. Pseudosingle-domain titanomagnetite is the only magnetic mineral identified and variations in titanomagnetite concentration fall well within the accepted limits for relative paleointensity variations. No significant temporally persistent periodicities are observed in wavelet analyses of the paleointensity time series or in the rock magnetic parameters used for relative...[Show more]

dc.contributor.authorHorng, Chorng-Shern
dc.contributor.authorRoberts, Andrew P.
dc.contributor.authorLiang, Wen-Tzong
dc.date.accessioned2011-07-12T00:49:25Z
dc.date.available2011-07-12T00:49:25Z
dc.identifier.citationJournal of Geophysical Research 108.B1 (2003): 2059/1-15
dc.identifier.issn0148-0227
dc.identifier.urihttp://hdl.handle.net/1885/8116
dc.description.abstractWe present a 2.14-Myr astronomically tuned relative geomagnetic paleointensity record from the western Philippine Sea. Pseudosingle-domain titanomagnetite is the only magnetic mineral identified and variations in titanomagnetite concentration fall well within the accepted limits for relative paleointensity variations. No significant temporally persistent periodicities are observed in wavelet analyses of the paleointensity time series or in the rock magnetic parameters used for relative paleointensity normalization. This suggests that our paleointensity record is largely free of rock magnetic or lithological artefacts and that it represents a reliable record of geomagnetic behavior with no evidence for modulation of the field at Earth orbital periods. The paleointensity record is highly coherent with the Sint-800 global paleointensity stack for the last 800 kyr and with a coeval record from the West Caroline Basin. Our record confirms that it is normal for the geomagnetic field to undergo dynamic changes within polarity intervals, with relatively frequent collapses of the field to low paleointensities and concomitant deviations away from the stable field direction. We do not observe an asymmetrical sawtooth form in our paleointensity record, which might suggest that previously observed asymmetrical sawtooth paleointensities result from rock magnetic artefacts. Also, we do not observe a persistent 100-kyr inclination periodicity, in contrast to the suggestion that geomagnetic field directions are modulated by orbital eccentricity. Good agreement between our paleointensity record and the coeval West Caroline Basin record provides the beginning of a detailed view of geomagnetic field behavior between 0.8 and 2.14 Ma.
dc.format15 pages
dc.publisherAmerican Geophysical Union
dc.rightshttp://www.agu.org/pubs/authors/usage_permissions.shtml "Permission to Deposit an Article in an Institutional Repository Adopted by Council 13 December 2009 AGU allows authors to deposit their journal articles if the version is the final published citable version of record, the AGU copyright statement is clearly visible on the posting, and the posting is made 6 months after official publication by the AGU."" - from publisher web site (as at 5/7/11)"
dc.source.urihttp://www.agu.org/pubs/crossref/2003/2001JB001698.shtml
dc.subjectgeomagnetic paleointensity, magnetostratigraphy, spectral analysis, wavelet analysis, Philippine Sea
dc.titleA 2.14-Myr astronomically tuned record of relative geomagnetic paleointensity from the western Philippine Sea
dc.typeJournal article
dcterms.dateAccepted2002-09-26
dc.date.issued2003-01-30
local.publisher.urlhttp://www.agu.org/
local.type.statusPublished Version
local.identifier.doi10.1029/2001JB001698
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/23863..."The Published Version can be archived in a Non-Commercial Institutional Repository. 6 months embargo" from SHERPA/RoMEO site (as at 8/11/2021). An edited version of this paper was published by AGU. Copyright (year) American Geophysical Union
CollectionsANU Research Publications

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