Paleomagnetic evidence for the clockwise rotation of Southwest Japan

Details Paleomagnetic evidence for the clockwise rotation of Southwest Japan Paleomagnetic evidence for the clockwise rotation of Southwest Japan

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..62..349o&link_type=abstract

Earth and Planetary Science Letters, Volume 62, Issue 3, p. 349-359.

Physics

57

Scientific paper

Over 500 oriented samples of felsic rocks of Cretaceous to Middle Miocene age were collected along the Gō River in the central part of Southwest Japan, in an attempt to detect the process of tectonic rotation of Southwest Japan from the paleomagnetic view point. Thermal demagnetization was successful in isolating characteristic directions from the remanent magnetization of samples. Reliability of the paleomagnetic direction is ascertained through the agreement of directions from different kinds of rocks as well as the presence of both normal and reversed polarities. The paleomagnetic results establish that Southwest Japan began to rotate clockwise through 58 +/- 14° later than 28 Ma and ceased its motion by about 12 Ma. Southwest Japan has undergone no detectable north-south translation since 28 Ma. These results imply that southwest Japan was rotated about the pivot around 34°N, 129°E between 28 Ma and 12 Ma in association with the opening of the Japan Sea.

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