TWO TYPES OF ACCRETIONARY FOLD BELTS IN CENTRAL JAPAN

Sedimentary and structural characteristics in two types of accretionary fold belts in central Japan are introduced and the tectonic significance are discussed. The Shimanto Fold Belt, grown up from the Cretaceous arc-trench gap and trench slope sediments, has the collisional features of large scale folds. The fold styles in the belt are differently developed in inner and outer parts. The former is characterized by a series of shear folds and the latter is by a series of lens folds. This difference may be caused chiefly by the different geothermal gradients of the area. The Miocene Miura Basin is influenced by lateral compression of strike slip field at the time of sedimentation. The development of the basin was related to the strike slip motion at the plate boundary between the Philippine Sea and Asian Plates.

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