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A new inclination-based method to evaluate the global geomagnetic configuration and axial dipole moment

Earth and Planetary Physics 2022年第4期6卷 359-365页

作者： KaiHua Xu Fei He Yong Wei Ross N.Mitchell Si Chen YuQi Wang ZhaoJin Rong Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China School of Earth and Environment University of LeedsLeedsLS29JTUK

The strength and configuration of the geomagnetic field control the average shape of the *** pure dipole assumption and the virtual dipole moment(VDM),determined by individual records,have been widely adopted to evaluate the strength of the geomagnetic field in geological ***,such an assumption might not be valid during geomagnetic transitions,such as reversals and *** traditional spherical harmonic modeling of the geomagnetic field could be difficult to implement because accurate global records are ***,we report that an empirical relationship exists between the ratio of the VDM to the true axial dipole moment(VDM/ADM)and the ratio of the power of the axial dipole to that of the non-axial dipole(AD/NAD)based on a new method utilizing globally distributed inclination *** root mean square global deviation of inclination(RMSΔI)to the standard inclination distribution of the AD was fitted to the AD/NAD with a cubic polynomial by utilizing a large number of geodynamo *** with geomagnetic field models showed that the AD/NAD derived from the RMSΔI agreed well with that calculated by using the Gauss coefficients,and the estimated ADM was consistent with the true ***,the application of volcanic records during the Laschamp excursion showed the VDM might overestimate the ADM by a factor of *** new method will be useful in future studies that characterize the configuration of the geomagnetic field and the strength of the axial dipole.

关键词： axial dipole magnetic inclination virtual dipole moment

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The paleomagnetism and geological significance of Meso-proterozoic dyke swarms in the central North China Craton

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Science China Earth Sciences 2001年第2期44卷 185-192页

作者：侯贵廷李江海钱祥麟张宝兴 H.C.Halls 1. Department of Geology Peking University 100871 Beijing China 2. Department of Geoscience University of Toronto Canada

The Mesoproterozoic mafic dyke swarms are extensively distributedin the central North China Craton(NCC) including North Shanxi, Wutai and Lüliang areas, which are not deformed and metamorphic but high magnetic, so the dyke swarms become the mark to compare the high meta-morphic rock areas in magnetism. Based on the analysis of paleomagnetism of mafic dyke swarms in North Shanxi, Wutai and Lüliang areas, NCC inclined southward about 18° so that North Shanxi lifted up and rotated 10° left to Wutai area. The dyke swarms in Lüliang developed later than in North Shanxi and Wutai area. The NNW-trending and WNW-trending dyke swarms developed in Lüliang while the North China Plate moved northward consistently so that the paleomagnetism of dyke swarms in Lüliang is greatly different from North Shanxi and Wutai area.

关键词： Mesoproterozoic mafic dyke swarms paleomagnetism magnetic inclination magnetic declination apparent polar wander path

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