Change in fabric of melange in the Shimanto belt, Japan: change in relative convergence?

Article Abstract:

Systematic changes in the fabric of melanges in the accretionary complex of the Shimanto belt, Japan, are due to a change in relative convergence between subducting and overriding plates in the Pacific rim. Most likely, the Kula-Pacific ridge was subducted sometime after 43 Ma, in the late Cretaceous to Early Tertiary western Pacific margin. This would explain the change in relative convergence from left to right. Details of field observations of recurring structures in the tectonic melange are given.

Models, Plate tectonics, Subduction zones (Geology), Subduction zones

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Duplexing and intraprism deformation of the Paleogene Shimanto supergroup in Western Shikoku, Southwest Japan

Article Abstract:

The Kurusuno formation in Western Shikoku, Southwest Japan, is part of the late Eocene to early Oligocene Shimanto Belt. Structural analysis shows that the formation was developed by transverse currents which generated trench fan deposition. The duplex nature of the formation was created by underthrust and underplate thick trench sedimentation. Younger trench fill sediments which underplated below previously accreted material conditioned uplift formation.

Rock deformation, Formations (Geology), Geological formations

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Fault kinematics and past plate motions at a convergent plate boundary: Tertiary Shimanto Belt, southwest Japan

Article Abstract:

The Tertiary Shimanto Belt, southwest Japan was studied and fault kinematics and past plate motions at the convergent plate boundary were deduced.

Faults (Geology)

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