Earth, Planets and Space

, Volume 59, Issue 7, pp 879–885 | Cite as

New K-Ar ages of the Society Islands, French Polynesia, and implications for the Society hotspot feature

  • K. Uto
  • Y. Yamamoto
  • M. Sudo
  • S. Uchiumi
  • O. Ishizuka
  • T. Kogiso
  • H. Tsunakawa
Open Access


We report 52 new K-Ar age determinations of volcanic rocks from the Society Islands in French Polynesia. The newly obtained ages range from 0.51 to 4.61 Ma, which are consistent with previously reported ones. The magnetostratigraphy based on 45 data sets combining K-Ar ages and paleomagnetic polarity agrees with the geomagnetic polarity time scale at the 2s level, except for a few age data. Assuming the absolute motion of the Pacific plate, paleopositions of the dated rocks are estimated from the K-Ar ages, showing a narrow distribution in the western part of the easternmost volcano of the active hotspot region. This suggests that a hotspot of a few tens of kilometers in diameter might have been fixed nearly at the eastern margin of the presently active region in the Society archipelago and that the volcanism of each island might have persisted for about 1 myr.


K-Ar ages Society Islands magnetostratigraphy hotspot paleoposition 


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Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2007

Authors and Affiliations

  • K. Uto
    • 1
  • Y. Yamamoto
    • 2
  • M. Sudo
    • 3
  • S. Uchiumi
    • 1
  • O. Ishizuka
    • 1
  • T. Kogiso
    • 4
  • H. Tsunakawa
    • 5
  1. 1.AISTGeological Survey of JapanTsukuba, IbarakiJapan
  2. 2.Geomagnetism LaboratoryUniversity of Liverpool, Oliver Lodge LaboratoriesLiverpoolUnited Kingdom
  3. 3.Institute of Earth SciencesUniversity of PotsdamGolmGermany
  4. 4.Institute for Research on Earth Evolution (IFREE)JAMSTECKanagawaJapan
  5. 5.Department of Earth and Planetary SciencesTokyo Institute of TechnologyTokyoJapan

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