Newly found granulites from the western part of Sefuri Mountains, North Kyushu

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  • Owada Masaaki
    Department of Earth Sciences, Yamaguchi University
  • Hada Ryoichi
    Department of Earth Sciences, Yamaguchi University
  • Yada Jun
    Department of Earth Sciences, Yamaguchi University Present address: Kaminaga Co. Ltd.
  • Nakamura Mai
    Department of Earth Sciences, Yamaguchi University
  • Osanai Yasuhito
    Department of Evolution of Earth Environments, Kyushu University

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  • 新たに見い出された北部九州，脊振山地西部のグラニュライト相変成岩類
  • アラタ ニ ミイ ダサレタ ホクブ キュウシュウ セフリ サンチ セイブ ノ グラニュライトソウ ヘンセイガンルイ

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Description

Newly found metamorphic block (c. 3 km × 1 km) within the Cretaceous granitic rocks in the Mt. Uki-dake area, northwest Kyushu, consists of two-pyroxene rock, garnet-orthopyroxene-cordierite gneiss and orthopyroxene tonalite being associated with layers or lenses of calcsilicate and ultramafic rocks. Geothermobarometries yield granulite-facies metamorphic conditions, approximately at 800 to 900°C and 400 to 500 MPa. On the basis of the similarity of the lithology and the metamorphic conditions, we propose that the present granulite-facies block and the neighboring amphibolite-facies block at the western part of Sefuri Mountains can be correlated to the high-grade sequence of the Higo metamorphic terrain in west-central Kyushu.<br>

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