<国立科博専報>伊豆半島西部, 松崎地域の古地磁気

概要

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Paleomagnetic measurement was made on the volcanic and pyroclastic rocks named as the Nishina Group and the"Shirahama Group"stratigraphically distributed in the Matsuzaki area, western part of the Izu Peninsula. The intensities of natural remanent magnetization, and the ratios of the intensity of natural remanent magnetization to the intensity of remanent magnetization after alternating field demagnetization, are related to the lithology of samples. The mean of the measured paleomagnetic inclinations of the upper"Shirahama Group"(I=48.7°) is nearly the same as that of the present time. But the mean of the measured paleomagnetic inclinations of the lower Nishina Group (I=27.8°) is shallower than that of the present time. The mean of the measured paleomagnetic declinations of both the Nishina Group and the"Shirahama Group"are nearly the same as that of the present time. This indicates that there has been no tectonic rotation of large scale in the studied area.
国立科学博物館の論文
1982-00-00