K-Ar dating of volcanic rocks along the Aira caldera rim: part 2-volcanic history of western and northwestern area of caldera and Sakurajima volcano-

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  • 姶良カルデラ周縁部に分布する火山岩のK-Ar年代測定(続報)-カルデラ西縁,北西縁部,及び桜島火山の活動史-

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Abstract

Volcanic history of Aira caldera was discussed by K-Ar dating of volcanic rocks from western Yoshino-dai area, Aoshiki basalt at northwestern Kamo area and those from Sakurajima volcano. The result implies that the caldera wall at Yoshino-dai area formed at least after 0.35 Ma. The K-Ar age of 0.08 Ma from Aoshiki basalt also implies that the activity of basaltic magmas occurred a few ten thousand years before the Aira pyroclastic eruption. The reanalysis of lava flow from the bottom in the Harutayama onservation well of Sakurajima volcano shows its eruptive age within a ten thousand years, which agrees with the previous result.

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Details

  • CRID
    1050001335593015808
  • NII Book ID
    AN00027784
  • ISSN
    0386412X
  • HANDLE
    2433/80514
  • Text Lang
    ja
  • Article Type
    departmental bulletin paper
  • Data Source
    • IRDB

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