Paleogeographic reconstruction of the Philippine Sea at 5 m.y. B.P.

Details Paleogeographic reconstruction of the Philippine Sea at 5 m.y. B.P. Paleogeographic reconstruction of the Philippine Sea at 5 m.y. B.P.

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..51..406m&link_type=abstract

Earth and Planetary Science Letters, Volume 51, Issue 2, p. 406-414.

Physics

17

Scientific paper

The Philippine Sea at 5 m.y. B.P has been reconstructed by the following process. Firstly, it was rotated rigidly relative to the Eurasian plate around the pole of rotation at 45.5°N, 150. 2°E with a rotation angle of 6.0° for the past 5 m.y. Secondly, the evolution and deformation along the plate boundaries were incorporated in the rigid rotation. This reconstruction suggests: (1) the Izu Peninsula, which was originally a volcanic island of the Izu-Bonin Arc, collided with central Honshu in a west-northwest direction a few million years B.P.; (2) a TTT(a)-type triple junction east of Honshu has migrated west-northwestward relative to the Eurasian plate; and (3) the subduction zone of the Pacific plate, beneath the central part of the Mariana Arc, has remained fixed relative to Eurasia. Westward motion of the Philippine Sea plate and subduction beneath the eastern Eurasian margin resulted in the opening of the Marian Trough.
Present address: International Institute of Seismology and Earthquake Engineering, Building Research Institute, Ministry of Construction, Tsukuba, Japan.

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