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Volumn 273, Issue 5276, 1996, Pages 776-779

A statistical model of the fluctuations in the geomagnetic field from paleosecular variation to reversal

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; ASTRONOMY; COMPUTER SIMULATION; DIPOLE; GEOGRAPHY; GEOLOGY; MAGNETIC FIELD; PRIORITY JOURNAL; STATISTICAL MODEL; VOLCANO;

EID: 0029663504     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.273.5276.776     Document Type: Article
Times cited : (35)

References (39)
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    • note
    • In the literature, no clear physical distinction is made between secular and paleosecular variation processes. According to the model presented in this report, the paleosecular variation is the sum of SV and a slower variation of the AD.
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    • note
    • For each flow, we calculated the average direction and remanence intensity after alternating field-cleaning at 10 mT or more. The proportionality between this remanence and the paleofield intensity holds if (i) the primary remanence is a thermoremanent magnetization, which is believed to be the case for basaltic rocks; (ii) secondary magnetizations are absent or were destroyed by the cleaning treatment; and (iii) the effects of mineralogical variations (from one flow to the other) on remanence intensity are averaged out. For the best documented region (Iceland), we demonstrate (in P. Camps and M. Prévot, in preparation) that the viscous secondary remanence left after treatment is negligible. The effects of mineralogical variations are almost entirely averaged out (Figs. 1C and 3C), as attested by the small dispersion of data (all calculated from distinct classes). The database is available through anonymous FTP at ftp.dstu.univ-montp2.fr; use your e-mail address as the password and type cd pub/paleomag.
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    • note
    • We thank D. K. Bingham, S. C. Bogue, E. Mankinen, P. Roperch, and H. Shibuya for providing unpublished paleomagnetic data and R. Coe for reviewing the first version of this manuscript. This research was completed while P.C. held the position of postdoctoral researcher at the University of California, Santa Cruz, supported by a Ministère de l'Enseignement Supérieur et de la Recherche grant. Contribution CNRS-INSU-DBT "Terre Profonde" 55.


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