Deformation history of tectonic melange and its relationship to the underplating process and relative plate motion: an example from the deeply buried Shimanto Belt, SW Japan

Article Abstract:

Research into the deformation process of the deeply buried Shimanto Belt in southwest Japan is presented. The fabric preserved in the tectonic melange has extensional thinning deformation because of shear along a decollement followed by posterior shortening and thickening caused by imbrication connected with underplating.

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Off-scraping accretionary process under the subduction of young oceanic crust: the Shimanto Belt of Okinawa Island, Ryukyu Arc

Article Abstract:

The Shimanto Belt refers to an uplifted accretionary belt that is located in the Ryukyu Arc and Pacific side of southwest Japan. The Eocene Kayo Formation of the Shimanto Belt was characterized as an off-scraping accretionary process that was deposited within a trench setting by axial currents that were parallel to the general strike formation. Furthermore, the early deformation of the region occurred as bedding-parallel shortening and low cohesion which reflected the initial stages of off-accretion.

Ryukyu Islands, Morphotectonics

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Underplating process from melange formation to duplexing: Example from the Cretaceous Shimanto Belt, Kii Peninsula, southwest Japan

Article Abstract:

Accretionary complexes are believed to form via off scraping and underplating, leading to lateral and vertical growth. An important part of the accretionary process is the accretion of the upper oceanic crust and formation of melange. The link between formation of melange and duplexing in the Miyama Assemblage has been studied, with emphasis on its structure of a composite suite of duplexes, and systematic asymmetry.

Observations, Geology, Stratigraphic, Stratigraphy, Icing (Meteorology), Ice accretion, Cretaceous period

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