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Evolution of the virtual dipole moment through the Paleoarchean-Phanerozoic

机译:通过古生代-半生代的虚拟偶极矩的演变

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摘要

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.
机译:在地球磁场的偶极子模型的背景下,来自国际数字信息银行的有关虚拟偶极矩(VDM)值的时间分布的数据,以及通过后续研究获得的数据(总计7082个值) ),作为通过古古生代-古生代重建其行为的基础。 VDM行为的特征是在4.1 x 10(22)Am-2(3.5 Ga以前)到5.5 x 10(22)Am-2(现在)之间的正线性趋势。场强的这种背景线性增长由于不规则分布的VDM变化而变得复杂,该变化的幅度在1.7 x 10(22)到3.7 x 10(22)Am-2的范围内,波长在220到920 Ma之间变化。此类波动的平均波长估计为570 Ma,其持续时间约等于Wilson地质循环。首先建立0.84-1.3 Ga的间隔,以4.7-4.9 x 10(22)Am-2相对平静的VDM区域为特征。由10个数据点描述的第一个定义的深度最小值,其极值为2.3 x 10(22)Am-2(2.15 Ga之前),对应于地球核心几何结构形成和现代偶极子形成开始的末期阶段领域。

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