Imaging of a serpentinite complex in the Kamuikotan Zone, northern Japan, from magnetotelluric soundings

Abstract We conducted magnetotelluric measurements to investigate a large serpentinite complex in the northern Kamuikotan Zone that intruded Cretaceous–Paleocene forearc sedimentary sequence. The resistivity model we derived by three-dimensional inversion clearly shows low-resistivity zone beneath outcrop of complex. interpret represent aqueous pore fluid within mélange from subducting Pacific plate or mantle wedge. Previous geological studies area have shown had uplifted during early Pleistocene. They indicate ultramafic rocks and fluids continued rise area. uplifting body might formed enriched promoted occurrence previously identified intra-plate slow slip event. These results demonstrate important role transport tectonic processes related uplift subduction zones.