Holocene paleoenvironmental changes at coastal Kuninaka Plain, Sado Island, off central Japan, as deduced from analysis of drilling data

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  • 佐渡島国中平野南西部における沖積層のボーリング調査による古環境と地殻変動
  • サドガシマ クニナカ ヘイヤ ナンセイブ ニ オケル チュウセキソウ ノ ボーリング チョウサ ニ ヨル コカンキョウ ト チカク ヘンドウ

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This study aims to clarify the paleoenvironmental changes at the southwestern part of the Kuninaka Plain, Sado Island, off central Japan, by the analysis of drilling cores at four sites. The study area is located on the footwall of the active Kuninakaminami Fault, striking NE to SW. Observation of stratigraphy, analysis of molluscan and foraminiferal assemblages, and radiocarbon dating were carried out on all the cores, supplemented by diatom and pollen analysis at two cores. The Holocene marine transgression started ca. 8,000 yrs BP when the southwestern part of the Kuninaka Plain was open sea coast, and culminated ca. 7,000-6,000 yrs BP, forming an embayment in association with sea level rise and reaching a slightly higher sea level position than the present. Sea level has gradually lowered to the present level since 5,000-4,000 yrs BP. The reconstructed sea level curve is approximately similar to the predicted sea level curve based on the hydroisostatic calculation, which suggests that this area has been tectonically stable. No evidence of remarkable subsidence is recognized from the four cores, even though the area is located on the footwall of an active fault.

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