Abstract
The southern tip of the Miura Peninsula, central Japan, exposes nice outcrops of forearc sediment accreted to another forearc, which occurred during a series of Izu arc collision with the Honshu arc. Neogene deep marine volcaniclastic sedimentary sequences, the Misaki Formation, show many types of faulting and folding associated with layer-parallel faults besides many imbricate thrusts of the main deformation stage. The layer-parallel faults are divided into two stages, one is related to northwestward gravity-driven slump deposits, the other is southeastward thrust faulting, and the both are associated with many layer duplications with liquefaction of sediments. The slumping is commonly developed in the upper part of the sequence in the surface of the down-going slab before accretion, whereas the thrusting is dominant in the lower part within the toe of the accretionary prism, probably along the decollement zones in the prism. Thus, the Misaki Formation represents a good example of deformation just before and after shallow forearc accretion in the arc–collision zone.
Published Version
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