Offset in radiocarbon age between plant and shell pairs in Holocene sediment around the Mae-ho Lagoon on the eastern coast of Korea
Offset in radiocarbon age between plant and shell pairs in Holocene sediment around the Mae-ho Lagoon on the eastern coast of Korea
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DOI：
10.1016/j.quaint.2016.10.036
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发表时间：
2017-08
影响因子：
2.2
通讯作者：
Toshimichi Nakanishi;W. Hong;K. Sung;R. Nakashima;W. Nahm;Jaesoo Lim;K. Katsuki
中科院分区：
文献类型：
--
作者：
Toshimichi Nakanishi;W. Hong;K. Sung;R. Nakashima;W. Nahm;Jaesoo Lim;K. Katsuki
为了检测韩国东海岸水库效应的长期变化，我们从Mae-ho泻湖周围填海造陆的大约12米的全新世沉积物中测量了同一层位的陆生植物和海洋贝壳对的放射性碳年龄。对泻湖沉积物的岩性、沉积构造以及软体动物和硅藻组合进行了研究。沉积物自下而上由三个单元组成：海侵泻湖、局限泻湖和三角洲。9对沉积物的~(14)C年龄偏移也可分为3个阶段：300a±90年至410a±120a(7350~5800a l的海侵泻湖沉积)，640a±1150a至800a±1150年(4320~1600a的局限泻湖沉积)和120a±140a至330a±1100年(三角洲沉积于1200~390年)。海侵泻湖和局限泻湖沉积物中的储集层年龄(R)分别包括与贝类食性有关的变化、与食草性有关的变化和与沉积物摄食有关的变化。三角洲泻湖沉积物中的R值是Mae-ho泻湖沉积物中最具代表性的，因为它们是从最近沉积物中的滤食性分类群PotamocorBula amurensis的壳中获得的。这些来自三角洲泻湖沉积物的数值也与之前报道的来自朝鲜半岛和符拉迪沃斯托克周围的彼得大湾的现代油藏年龄一致。
To detect long-term change in the reservoir effect of the eastern coast of Korea, we measured the radiocarbon ages of terrestrial plant and marine shell pairs from the same horizons from approximately 12 m of Holocene sediments under reclaimed land around the Mae-ho Lagoon. The lagoon sediment was examined for lithology, and sedimentary structures, as well as mollusk and diatom assemblages. From bottom to top the sediment comprised three units: transgressive lagoon, restricted lagoon, and delta. The offset in the radiocarbon age of nine pairs were also divided into three stages: 300 ± 90 to 410 ± 120 years (transgressive lagoon sediment in 7350–5800 cal BP), 640 ± 150 to 800 ± 150 years (restricted lagoon sediment in 4320–1600 cal BP), and 120 ± 140 to 330 ± 100 years (deltaic sediment in 1200–390 cal BP). The reservoir ages (R) in the sediments of transgressive lagoon and the restricted lagoon include the variation associated with dietary of shells, herbivorous and deposit-feeding, respectively. The R values in the deltaic lagoon sediment were the most representative of those in the Mae-ho Lagoon because they were obtained from the shells of a filter-feeding taxon,Potamocorbula amurensis, in the most recent sediment. These values from the deltaic lagoon sediment are also consistent with previously reported modern reservoir ages from the Korean Peninsula and Peter the Great Gulf around Vladivostok.