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Geomagnetic Field Effects on Living Systems
Published in Shoogo Ueno, Tsukasa Shigemitsu, Bioelectromagnetism, 2022
That is, the virtual geomagnetic pole (VGP) latitude and dipole moment variations, both of which are an indicator of GMF fluctuations in the Chiba composite section, were compared through time using the chronology of Suganuma et al. (2018). It is estimated that this meteorite impact around 790 ka, “immediately before the decline in the GMF intensity,” which is the process of the beginning of GMF reversal, before the timing of the reversal. During a meteorite impact, small glass particles called “microtektites” (Glass, 1990) are scattered over a wide area. If this microtektite is also contained in the ancient strata of the Chiba composite section, it is considered that the timing of this meteorite impact event can be determined directly from the strata of the Chiba composite section. Currently, the search for microtektites has begun in the strata of the Chiba composite section (Suganuma et al., 2018). In the future, if microtektites are found, the relationship between meteorite impact event and GMF reversal will be clear (Suganuma et al., 2018). This research approach could provide a major breakthrough in solving the mystery of GMF reversal (Suganuma et al., 2018).
Paleomagnetism of the Carboniferous Gresford Block, Tamworth Belt, southern New England Orogen: minor counter-clockwise rotation of a primary arc segment
Published in Australian Journal of Earth Sciences, 2020
Directions at the Gresford reference location for mean-site poles for the main low-temperature subcomponents (Table S7, L1&L: D = 359.0°, I = –66.7°, n = 73, kp = 33.3, ep95 = 2.9°; L2&L: D = 1.2°, I = –66.6°, n = 73, kp = 32.3, ep95 = 3.0°; L3&L: D = 0.3°, I = –65.9°, n = 48, kp = 26.6, ep95 = 4.1°) do not correspond with the local axial geocentric dipole direction (D = 0°, I = –51.8°) but are close to the present local field direction (D = 12.4°, I = –63.0°) as indicated by the distribution of site-mean poles and closeness of the mean-site poles to the local virtual geomagnetic pole for the Gresford Block (reference location at East Gresford: 151.57°E, 32.42°S) (Figure 18a–e).