Evolution of the virtual dipole moment through the Paleoarchean-Phanerozoic

Schreider, A.A. and Schreider, Al.A. and Varga, Péter and Denis, C. (2015) Evolution of the virtual dipole moment through the Paleoarchean-Phanerozoic. OCEANOLOGY, 55 (2). pp. 245-252. ISSN 0001-4370

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In the context of the dipole model of the earth's magnetic field, the data from the international bank of digital information on the distribution of the virtual dipole moment (VDM) values in time, combined with the data obtained by subsequent investigations (7082 values in total), served as the basis for reconstructing its behavior through the Paleoarchean-Phanerozoic. The VDM behavior is characterized by a positive linear trend in the interval of 4.1 x 10(22) Am-2 (3.5 Ga ago) to 5.5 x 10(22) Am-2 (now). This background linear growth of the field strength is complicated by irregularly distributed VDM variations ranging in the amplitude from 1.7 x 10(22) to 3.7 x 10(22) Am-2 with the wavelength varying from 220 to 920 Ma. The average wavelength of such fluctuations is estimated to be 570 Ma, which is approximately equal by duration to the Wilson geological cycles. The interval of 0.84-1.3 Ga is first established to be characterized by the relatively calm VDM region of 4.7-4.9 x 10(22) Am-2. The first defined deep minimum described by 10 data points with the extremum of 2.3 x 10(22) Am-2 (2.15 Ga ago) corresponds to the terminal phase in the formation of the earth's core geometry and initiation of the formation of the modern dipole field.

Item Type: Article
Subjects: G Geography. Anthropology. Recreation / földrajz, antropológia, kikapcsolódás > GC Oceanography / tengerkutatás
Depositing User: MTMT SWORD
Date Deposited: 06 Oct 2015 10:18
Last Modified: 13 Oct 2015 07:14

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