Paleomagnetic record over the past 35,000 years of a sediment core from off Shikoku, southwest Japan

Masao Ohno, Yozo Hamano, Masafumi Murayama, Eiji Matsumoto, Hirokazu Iwakura, Toshio Nakamura, Asahiko Taira

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Abstract

The paleomagnetism of a sediment core (KT89‐18, P4), recovered from the sea floor off Southwest Japan, was studied to investigate geomagnetic field variation over the past 35,000 years. Alternating fields demagnetization revealed that the remanent magnetization of the unconsolidated sediments was stable and not affected by any secondary overprints. 14C datings were made on 21 horizons, using a Tandetron accelerator mass spectrometer, providing a detailed time scale to the core. The inclination record agrees with that from Lake Biwa [Kawai et al., 1975], and supports the existence of the geomagnetic excursions which had been found in the Lake Biwa core. The ages of the excursions are estimated to be during ca. 32 ky.B.P. ∼ ca. 28 ky.B.P. and ca. 26 ky.B.P. ∼ ca. 24 ky.B.P.

Original languageEnglish
Pages (from-to)1395-1398
Number of pages4
JournalGeophysical Research Letters
Volume20
Issue number13
DOIs
Publication statusPublished - Jul 9 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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    Ohno, M., Hamano, Y., Murayama, M., Matsumoto, E., Iwakura, H., Nakamura, T., & Taira, A. (1993). Paleomagnetic record over the past 35,000 years of a sediment core from off Shikoku, southwest Japan. Geophysical Research Letters, 20(13), 1395-1398. https://doi.org/10.1029/93GL01241