Peak metamorphic temperature of the Nishisonogi unit of the Nagasaki Metamorphic Rocks, western Kyushu, Japan

DOI Web Site 被引用文献8件 参考文献29件 オープンアクセス
  • MORI Yasushi
    Kitakyushu Museum of Natural History and Human History
  • SHIGENO Miki
    Kitakyushu Museum of Natural History and Human History
  • MIYAZAKI Kazuhiro
    Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology
  • NISHIYAMA Tadao
    Graduate School of Science and Technology, Kumamoto University

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<p>The Nishisonogi unit of the Nagasaki Metamorphic Rocks represents a part of a Late Cretaceous subduction complex exposed in western Kyushu, Japan. We estimate peak metamorphic temperatures using a Raman carbonaceous material (CM) geothermometer on 60 pelitic schists. No systematic regional changes were observed in the mineral assemblage of samples collected over a large area (about 30 × 15 km), which include chlorite ± garnet + white micas + albite + quartz + titanite + CM. However, the estimated peak metamorphic temperature increases structurally upward from 440 to 524 °C, suggesting an inverted thermal gradient.</p>

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