The active period of the Ayu Trough estimated from K-Ar ages: the southeastern spreading center of Philippine Sea Plate

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Abstract

In order to estimate the active period of the Ayu Trough, which lies at the boundary between the Philippine Sea Plate and the Caroline Plate, we measured K-Ar ages of submarine rocks dredged from the region. Samples recovered from the trough axis are similar to typical MORB and/or BABB in chemical and petrological features and show K-Ar ages of around 1 Ma. This suggests that the Ayu Trough might have been a spreading center at least during the last 1 million years. While, samples recovered at a site 62 km east of the axial rift valley show K-Ar ages of 20–25 Ma, and they are high-alkali andesites. If these samples indicate that an island arc existed there at 25 Ma, the activity of the Ayu Trough might have started at 25 Ma or later.

Journal

  • GEOCHEMICAL JOURNAL

    GEOCHEMICAL JOURNAL 30(2), 81-87, 1996-04-01

    GEOCHEMICAL SOCIETY OF JAPAN

References:  15

Cited by:  1

Codes

  • NII Article ID (NAID)
    10008800638
  • NII NACSIS-CAT ID (NCID)
    AA00654975
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    00167002
  • Data Source
    CJP  CJPref  J-STAGE 
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