Timing of rotational motion of Southwest Japan inferred from paleomagnetism

Details Timing of rotational motion of Southwest Japan inferred from paleomagnetism Timing of rotational motion of Southwest Japan inferred from paleomagnetism

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..70..373y&link_type=abstract

Earth and Planetary Science Letters, Volume 70, Issue 2, p. 373-382.

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42

Scientific paper

Paleomagnetic field directions for the period younger than 35 Ma are obtained from igneous rocks distributed in the San'in district, Inner Zone of Southwest Japan. The remanent magnetization of samples between 30 and 35 Ma old are fairly well grouped with a mean direction of D = 65.9°, I = 48.6°, and α95 = 6.5°. This result establishes that Southwest Japan rotated clockwise 56 +/- 12° during the past 30 m.y. A declination value of about 60° is observed in the rocks of 28 Ma (D = 52.2°, I = 33.5°) and 21 Ma (D = 69.9°, I = 49.5°). Comparing this with results from dacitic rocks with an age of 15 Ma in other areas of Southwest Japan suggests that rotational motion did not occur possibly until 15 Ma. These results require that the rotation of Southwest Japan occurred just after the Shikoku Basin had been created.

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