Thermal structure in subducted units from continental Moho depths in a palaeo subduction zone, the Asemigawa region of the Sanbagawa metamorphic belt, SW Japan

DOI Web Site Web Site 被引用文献15件 参考文献80件
  • Yui Kouketsu
    Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Kazushi Sadamoto
    Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Hayato Umeda
    Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Hirokazu Kawahara
    Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Takayoshi Nagaya
    Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Tomoki Taguchi
    Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Hiroshi Mori
    Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Simon Wallis
    Graduate School of Environmental Studies Nagoya University Nagoya Japan
  • Masaki Enami
    Nagoya University Nagoya Japan

書誌事項

公開日
2021-04-05
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/jmg.12584
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>Raman CM geothermometry applied to 126 samples of pelitic schists collected over an area of 11 km × 7 km reveals the thermal structure of the Asemigawa region of the Sanbagawa metamorphic belt, southwest Japan in unprecedented detail. In general, the estimated temperatures gradually increase from south to north in the range of 288–553°C. However, a temperature gap from ~380 to ~440°C is identified near the boundary between the chlorite and garnet zones. This temperature region matches the depth of the continental Moho of the Sanbagawa subduction zone. The temperature gradient in the higher‐temperature domain is higher than that in the lower‐temperature domain, and large‐scale tight folds that affect the thermal structure are developed in the high‐grade units and in the vicinity of the temperature discontinuity. These geological structures probably reflect that the exhumed slab units was dammed at the Moho depth due to the upward movement being impeded by increase in the coupling strength of the overlying rocks associated with exhumation from beneath serpentinite rocks to a shallower domain overlain by crustal rocks. Changes in the coupling strength along the subduction boundary led the strong folding at the higher‐temperature domain and the pre‐formed foliation developed at the Moho depth may have acted as the tectonic boundary, resulting in a temperature discontinuity. These results will contribute to elucidating various geological phenomena occurring in the forearc regions of modern subduction zones.</jats:p>

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