Quaternary crustal movements examined from facies distribution in the Atsumi region, central Japan
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概要
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Quaternary deposits in the Atsumi region comprise six depositional sequences. Each sequence contains furthermore two facies associations relating to the glacio-eustatic sea-level changes. One is formed in barrier-island system during transgression and the other is in strand-plain system during regression.The top of each sequence can be marked by the beach facies. The present altitude of the beach facies can be used as a marker of paleo-highstand sea-levels. Absolute crustal movement of the region has been inferred from the magnitude of the glacio-eustatic sea-level changes. The region had been subsided at the mean rate of 0.28m/ky.r. till 330Ka, and it abruptly turned to uplift at the mean rate of 0.17m/ky.r.The level of each beach facies varies from place to place, probably reflecting differential crustal movements. Based on the difference in the elevation, wave length of the crustal bending is estimated to be 50 to 100km. Amplitude of the bending was less than 10m before 330Ka, while it was 50m after 330Ka.
- 日本堆積学会の論文
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