Abstract
Detailed kinematic analysis of thrust faults in a coherent accretionary complex, called the Inuyama Sequence, in the Mino-Tamba Belt, central Japan, have been carried out in a 3 km-long route along the Kiso River. The Inuyama Sequence in the study area is characterized by stacking of six regional-scale thrust sheets deformed by later-stage of W-plunging synform structure. Each sheet consists of an Early Triassic to Middle Jurassic oceanic plate stratigraphic succession. Slip-directions of thrust faults were, after correction of folding and tilting, calculated with pitches of slickenlines for 19 faults, a fabric of a duplex for one fault, and the slip-sense determined with mesoscopic and microscopic asymmetric structures. Left-lateral strike-slip faults also occur in the Inuyama Sequence, but they can be distinguished from thrusts based on differences of pitches of slickenlines and associated deformation features. The mean slip-direction of thrust faults are oriented to S30°E with respect to the N60°E-S60°W regional trend of the Inuyama Sequence. After restoration of rotation and bending of Southwest Japan, the mean slip-direction is probablly parallel to the normal subduction of the Izanagi Plate under the Asia Plate during the latest Jurassic to earliest Cretaceous.
