Holocene sedimentary facies, sediment accumulation rate and coastal subsidence estimated from a sediment core in the Rikuzentakata Plain, northeast Japan

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  • 陸前高田平野完新統の堆積相・堆積速度および推定される地殻変動傾向
  • リクゼンタカタ ヘイヤカンシントウ ノ タイセキソウ ・ タイセキ ソクド オヨビ スイテイ サレル チカク ヘンドウ ケイコウ

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Abstract

To begin the clarification of uplift/subsidence history along the southern Sanriku coast, a 40-m-long core sample (RT1 core) was extracted from the lower reaches of Rikuzentakata Plain, northeast Japan. On the basis of features of the core sediment, sedimentary facies was divided into braided river, tidal influenced environment, delta, and terrestrial marsh, in ascending order. Age-depth curve was described based on twenty-five 14C ages. For the estimation of Holocene vertical movement, observed relative sea-level (RSL) was compared with theoretical RSL. RSL at 9.5 to 8.6ka was estimated at −30 to −24m by using the altitude of depositional surface of tidal deposits shown by both age-depth curve and molluscan shells in intertidal zone. Estimated RSL is lower than theoretical RSL without tectonic effect. Probable cause of this discrepancy is Holocene tectonic subsidence of the studied area.

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