Abstract
Paleoenvironmental changes in the Japan Sea provide a clue for estimating the absolute value of eustatic sea level change during the last glacial age. Oxygen isotopic curves of planktonic foraminiferal tests in six piston cores from the Japan Sea show an abrupt change at the time just before deposition of AT volcanic ash. This phenomenon was caused by a supply of fresh water into the Japan Sea from the Huang Ho River in China, when sea level had dropped more than 95m, if we can assume that tectonic movement around Cheju Island located at south of the Korea Peninsula was negligible over the last twenty-several thousand years. The sea level at the last glacial maximum period is inferred to be 127±30m shallower than the present level. This value was estimated from the oxygen isotopic curves of benthic foraminiferal tests in two piston cores from the Pacific Ocean, by extrapolating the sea level difference (95m) between the age of the AT ash layer and the present to that between the last glacial maximum period and the present.
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