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Geomagnetic paleointensity over 1.2 Ma from deep-tow vector magnetic data across the East Pacific Rise

Abstract

Deep-tow vector magnetic data have been acquired across the fast-spreading southern East Pacific Rise 18°S and inverted to magnetization intensity variations. Vector magnetic data are used to determine continuous magnetic intensity within intervals of constant polarity over the Matuyama and Brunhes periods up to the Cobb Mountain event at 1.19 Ma. A comparison of our deep-tow vector data and a sediment core-derived geomagnetic paleointensity timescale suggests that the short-wavelength magnetic anomaly signal is indeed of geomagnetic origin and can be used to date the seafloor with a high resolution. The crustal age determined from our date reveals a highly asymmetric spreading rate for the recent period (since 0.3 Ma).

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Correspondence to Michiko Yamamoto.

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Yamamoto, M., Seama, N. & Isezaki, N. Geomagnetic paleointensity over 1.2 Ma from deep-tow vector magnetic data across the East Pacific Rise. Earth Planet Sp 57, 465–470 (2005). https://doi.org/10.1186/BF03351835

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Key words

  • Paleointensity variation
  • vector magnetic anomaly data
  • deep-tow survey
  • East Pacific Rise