Sanbagawa Subduction: What Went in, How Deep, and How Hot did it Get?

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  • Shunsuke Endo
    Department of Earth Science, Shimane University, Matsue 690-8504, Japan
  • Yui Kouketsu
    Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan
  • Mutsuki Aoya
    Graduate School of Technology, Industrial and Social Sciences, Tokushima University, Tokushima 770-8506, Japan

説明

<jats:p>The Sanbagawa belt is a “coherent” oceanic subduction-type metamorphic region representing a rock package predominantly derived from oceanic crust and accreted at depths of 20–80 km (300–700 °C). The thermal structure and lithological layers are complexly deformed but semi-continuous, in contrast to more commonly reported subduction-related domains dominated by mélange. The coeval Shimanto accretionary complex records accretion at depths &lt;15 km and the rocks are primarily terrigenous sediments. The Sanbagawa belt has a greater proportion of mafic rocks than the Shimanto complex, implying progressive peeling-off of oceanic plate stratigraphy with more basaltic oceanic crust slices accreted at deeper levels. Tectonic exhumation can be explained by three separate phases dominated by buoyancy-driven upflow, ductile thinning, and normal faulting.</jats:p>

収録刊行物

  • Elements

    Elements 20 (2), 77-82, 2024-04-01

    Mineralogical Society of America

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