Eustatic Sea-Level Change of 11-5 ka in Western Taiwan, Constrained by Radiocarbon Dates of Core Sediments

Twenty-nine cores and two outcrops in the Western Coastal Plain, each containing more than one radiocarbon date (5-20 ka; totally 74 dates), are used to determine the 11-5 ka eustatic sea level in Taiwan. All the dates are obtained from coastal sediments with deposition positions assumed ±3 m of the sea level. These dates can be used to calculate rock uplift (subsidence) rates for given eustatic sea-level data. The sea level data derived from Penghu (＜5ka) and the Sunda Shelf (＞11ka) are applied, and the rock uplift of the study sites is assumed to be steady over time. The 11-5 ka sea level is constructed by repetition of changing its shape until the dates in the same cores yield consistent rock-uplift rates. Optimal sea-level curves are found to fit all but seven dates used. These sea-level curves are characterized by: (1) a rapid rise (＞13mky^(-1)) around 11-10ka; (2) a rise of 8-9mky^(-1) from~10ka to 6.5-6.6ka when the sea level approached the modern level, and (3) a much slower rise after 6.5-6.6ka.

並列關鍵字

Core ； Eustatic sea level ； Rock uplift

國際替代計量

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