5:15 PM - 6:30 PM
[SSS27-P26] Structural and mineralogical characteristics of an ancient plate boundary fault in the Hidakagawa Formation, Kii Peninsula, Japan
Keywords:plate boundary fault, accretionary prism, Nankai trough
We here targeted the mélange unit of the Hidakagawa Formation, distributed around the Mio region, Kii Peninsula, and performed structural analysis of the fault rocks on the field and laboratory-based analyses such as XRD and SEM. We found a localized slip zone accompanying the evidence of intense shearing and melting, which might corresponds to an ancient seismogenic fault in the subduction boundary.