Fault structures and K-Ar dating of the Northern part of Koshiki Islands, west of Kyushu, Southwest Japan

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  • Tonai Satoshi
    Department of Ocean Floor Geoscience, Ocean Research Institute, the University of Tokyo
  • Itaya Tetsumaru
    Research Institute of Natural Sciences, Okayama University of Science
  • Oiwane Hisashi
    Department of Ocean Floor Geoscience, Ocean Research Institute, the University of Tokyo
  • Kiyokawa Shoichi
    Department of Earth and Planetary Sciences, Graduate School of Sciences, Kyushu University

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Other Title
  • 甑島列島北部地域における断層の構造とK-Ar年代
  • コシキジマ レットウ ホクブ チイキ ニ オケル ダンソウ ノ コウゾウ ト K Ar ネンダイ

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The Koshiki Islands in western Kyushu consist of the Upper Cretaceous to Paleogene sedimentary rocks and some igneous rocks. This area is one of the best places to understand the stratigraphy and structures of western Kyushu area. These structural data enable us to reconstruct the tectonic history of this area.<br>Based on the characteristics of faults and their crosscutting relationship, we identified two fault systems in the study area. One is the NW-SE trending normal fault system (F1 faults) and the other is the NNE-SSW trending oblique-slip normal fault system (F2 faults). K-Ar ages from one of F1 faults range 17.9-24.8 Ma.

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