Holocene sea-level history and tectonic movements, Republic of Korea.

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  • 韓国における完新世海水準変化史と地殻変動
  • 韓国における完新世海水準変化史と地殻変動〔英文〕
  • カンコク ニ オケル カンシンセイ カイスイジュン ヘンカシ ト チカク ヘン

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Many small former embayments on the Korean coast of the Yellow Sea have been diked and drained since early in the twentieth century. Beneath the thin veneer of rice-paddy soil and alluvium of these valleys are organic rich estuarine sediments that overlie weathered bedrock of colluvium. The basal 15cm of estuarine sediments are especially rich in detrital wood fragments that were mixed into high-tide peaty mud during the Holocene rise of sea level. Several suites of these basal estuarine mud samples have been dated by the radiocarbon method. The depths and ages of the samples are shown and a proposed Holocene sea-level curve for the Yellow Sea coast of the Korean Peninsula is shown.<br>From 8, 600y.B.P. to about 4, 800y.B.P. (radiocarbon years) the Korean Yellow Sea coast submerged at an average rate of about 1.6mm/yr. Subsequently the rate decreased to about 0.4mm/yr.<br>The Pohang-Yangsan tectonic block of southeastern Korea shows a succession of marine terraces on its eastern coast that are not dated, but probably extend back to at least the last interglacial age (about 125, 000 years ago). Late Pleistocene tectonic uplift of this block at a rate of about 0.1m/1, 000 years can be suggested.

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