The Kurohanayama basalt(Sendai, Japan) during the Late Miocene to Early Pliocene.

  • BAN Masao
    Department of Earth and Environmental Sciences, Faculty of Science, Yamagata University
  • OHBA Tsukasa
    Institute of Mineralogy, Petrology and Economic Geology, Tohoku Un iversity
  • HAYASHI Shintaro
    Department of Earth Science, College of Education, Akita University
  • UMEDA Koji
    Tono Geoscience Center, Power Reactor and Nuclear Fuel Development Corporation

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  • 中新世後期∼鮮新世前期に形成された,仙台市北西部の黒鼻山玄武岩
  • Kurohanayama basalt Sendai Japan during

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Abstract

The Kurohanayama basalt has been referred to as a representative rock of Quaternary basalts in northeast Japan. There has been a significant amount of petrological studies on these rocks, however, the effused age of the Kurohanayama basalt has not been established yet.<br>     In this study, we determined the K-Ar ages of rocks from the Kurohanayama basalt, and obtained 5.03±0.50, 5.2±1.2 and 5.64±0.31 Ma in age. From these data, we have shown that basalts of Kurohanayama effused some time between Late Miocene and Early Pliocene (4-6 Ma). Thus, the Kurohanayama basalt is Tertiary in age, and must be genetically separated from the Quaternary Funagata volcano.

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