Mid-Holocene sea-level fluctuation inferred from diatom analysis from sediments on the west coast of Korea

作者：Bak, Young-Suk

来源：Quaternary International, 2015, 384: 139-144.

DOI：10.1016/j.quaint.2014.08.018

• Diatoms
• Holocene
• Sea-level
• Fluctuations
• Transgression
• Korea

Diatoms from the KS2009 core sediment on the coast of the West Sea, Kunsan-si and the KR07 trench sediment collected from the neighboring Sabsi island, Korea, were analyzed for Holocene sea-level fluctuations. In KS2009 core sediment, results of AMS C-14 dating identified five stratigraphic horizons ranging from 2200 to 9100 BP. The results obtained by measuring the radiocarbon dating from the KR07 were as follows: -0.34 m.a.s.l: 6108 BP, -0.74 m: 6488 BP, -1.46 m: 6838 BP, and -1.58 m: 7208 BP. Diatom assemblages from KS2009 indicated: Facies A (barren zone: KS2009 (-23.5 to -20.3 m))-> Facies B (high tidal flat: KS2009 (-20.3 to -14.6 m)): Holocene marine transgression -> Facies C (mid tidal flat: KS2009 (-14.6 to -2.0 m)): falling sea-level - rising sea-level -> FaciesD(high tidal flat: KS2009 (-2 to 2 m)): rising sea-level. Thus, after seawater influx started at 8300 BP, seawater rose with fluctuations (rising and falling). The KR-07 trench deposit of Sabsi island showed: Facies A' (barren zone: KR07 (-1.58 to -1.18 m)) -> Facies B' (bog: KR07 (-1.18 to -0.76 m)) -> Facies C' (tidal marsh: KR07 (-0.76 to -0.52 m)) -> Facies D' (tidal flat: KR07 (-0.52 to -0.28 m)) -> Facies E' (tidal marsh: KR07 (-0.28 to -0.08 m)) -> Facies F' (tidal flat: KR07 (-0.08 to 0.06 m)). Transgression occurred first about 8,300 BP at the west coast of Korea: around 6300-6000 BP, there was a drop in the sea-level and around 6000-4000 BP, there was a rapid rise. Also, Repetition of falling and rising occurred since 4500 BP.

• 出版日期2015-10-14