Counterclockwise rotation of Northeast Japan: Paleomagnetic evidence for regional extent and timing of rotation

Details Counterclockwise rotation of Northeast Japan: Paleomagnetic evidence for regional extent and timing of rotation Counterclockwise rotation of Northeast Japan: Paleomagnetic evidence for regional extent and timing of rotation

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.121..503o&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 121, no. 3/4, p. 503-518

Computer Science

22

Japan, Paleomagnetism, Rotation, Sedimentary Rocks, Tectonics, Demagnetization, Igneous Rocks, Magnetization, Peninsulas, Sea Of Japan, Tertiary Period

Scientific paper

Early to Late Miocene welded tuffs have been sampled from northeast Honshu Island and the Oshima Peninsula of Hokkaido Island, Japan for paleomagnetic study. Characteristic directions with a high unblocking temperature component above 560C are isolated from 24 sites. Westerly declinations (D = -1 to approximately -91 deg) are indentified in welded tuffs older than 17 Ma from these areas. When combined with previous paleomagnetic data from welded tuffs, the Early Miocene paleomagnetic poles derived from northeast Honshu Island and the Oshima Peninsula are statistically indentical and indicate that northeast Honshu Island and the Oshima Peninsula were subjected to counterclockwise rotation as a single tectonic block. These results establish that the rotating block of Northeast Japan extends north to the Oshima Peninsula to the latitude 43 deg N. The dimension of this rotating block is of the order of 500 km. The paleomagnetic data provide a best curve for the rotation process, with the counterclockwise rotation reaching a climax at 15.0 ma and a net amount of rotation of 46 deg. The 500km long Northeast Japan block was rotated counterclockwise through more than 45 deg and accompanied a clockwise rotation of the 600 km long Southwest Japan block at about 15 Ma.

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