Geographical distribution of transitional VGPs: Evidence for non-zonal equatorial symmetry during the Matuyama-Brunhes geomagnetic reversal
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Complexity in Matuyama–Brunhes polarity transitions from North Atlantic IODP/ODP deep-sea sites
2017, Earth and Planetary Science LettersCitation Excerpt :New data from Sites U1304, U1305 and U1306 serve to bring “complexity” at the MBT (and top Jaramillo) out of the shadows, and ratifies “complexity” in MBT records observed at ODP Sites 983 and 984 (Channell and Lehman, 1997; Channell et al., 2004). This MBT behavior is distinctly different from the vast majority of polarity transition records that contributed to compilations of longitudinally constrained VGP paths in the early 1990s (Clement, 1991; Laj et al., 1991). We conclude that polarity transitions are not adequately captured by the vast majority of sedimentary and volcanic sequences because of insufficient or sporadic sedimentation rates or eruption rates, augmented by smoothing of magnetization directions due to non-instantaneous remanence acquisition in sediments, and cooling/terrain artifacts in lava flows.
Paleoenvironmental and climatostratigraphic insights for Marine Isotope Stage 19 (Pleistocene) at the Montalbano Jonico succession, South Italy
2015, Quaternary InternationalCitation Excerpt :Age assignments ranging from 766 ka to 820 ka are indicated in Chinese loess deposits, implying a correlation of the MB boundary to MIS 19–21 (Dodonov, 2005; Yang et al., 2007, and reference therein). Furthermore, the MB reversal is characterised by a transition in polarity lasting 5–8 kyrs (Channell and Kleiven, 2000; Channell et al., 2004; Leonhardt and Fabian, 2007) that is site location dependent (Clement, 2004; Leonhardt and Fabian, 2007), and by the occurrence of at least one (Sagnotti et al., 2014) or even four (Hyodo et al., 2006, 2011; Wang et al., 2006; Yang et al., 2008; Channell et al., 2010) short-lived reversal episodes. The latter have been associated with millennial scale pollen-derived climate variations possibly induced by changes in the geomagnetic field intensity and cosmic ray flux (Kitaba et al., 2009, 2013).
Core-Mantle Interactions
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