Comprehensive dynamics of subduction zone interior: insights from formation and exhumation of serpentinite melange

在俯冲带的深处，大洋板块正在俯冲，人们普遍认为，从俯冲板块排出的水流体与上覆的地幔发生反应，产生蛇纹岩。蛇纹岩混岩是蛇纹岩与俯冲洋板块（变质岩）碎片的混合物，代表了古俯冲带内部深部的地质成分和构造。在本次研究中，我对北海道三井-堀山和堀井地区以及小笠原海底大町海山暴露的蛇纹岩进行了野外测绘和岩石学研究。重建了深俯冲带的构造和动力学。

At deep portions of subduction zones, where an oceanic plate is being subducted, it is widely believed that water fluid expelled from the subducted plate reacts with the overlying mantle to produce serpentinites. Serpentinite melange is a mixture of serpentinite with fragments of the subducted oceanic plate (metamorphic rocks), and represents geologic components and structure of deep inside an ancient subduction zone. In this study, I made field mapping and petrological studies on serpentinites exposed in Mitsuishi-Horaisan and Horokanai areas of Hokkaido and Ohmachi Seamount at seafloor off Ogasawara.and reconstructed structure and dynamics of deep subduction zones.