Evolution of the radial sand ridge field in the southwestern Yellow Sea, China since the late MIS3
Evolution of the radial sand ridge field in the southwestern Yellow Sea, China since the late MIS3
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MIS 3晚期以来西南黄海辐射状沙脊场演化
DOI：
10.1127/zfg/2019/0640
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Zhang Zhenhua
中科院分区：
文献类型：
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作者：
Wang Longsheng;Hu Shouyun;Yu Ge;Wang Xiaohui;Ma Mingming;Liao Mengna;Wang Qing;Zhang Zhenhua
辐射沙洲位于黄海西南部，面积2万多平方公里。它呈扇形，从江苏海岸向海延伸140多公里。本文是基于一个从东沙地区的RSRF的岩心回收的分析结果，包括下钻沉积相分析，14 C测年，粒度组成，包括端元建模分析，烧失量（LOI）值，磁化率和解释这些参数的环境含义。通过该岩心与砂脊油田其他三个岩心的地层对比，恢复了东沙地区MIS 3以来的递进环境变化。结果表明，东沙地区经历了60-25 kaBP的洪泛平原环境，25-12 kaBP的古土壤形成期，到7 kaBP至今的辐射状潮汐沙脊场。沉积环境的演变主要受海平面升降的控制。从这些数据可以看出，洪泛平原和潮汐沙脊环境比古土壤环境暴露于更强的水动力条件。因此，这项研究不仅对该地区进行了古环境重建，而且为探索区域陆海相互作用提供了限制。
The radial sand ridge field (RSRF), which is in the southwestern Yellow Sea, occupies an area of more than 20,000 km2. It has a fan-like shape and extends for over 140 km seaward from the Jiangsu coast. This paper is based on the results of an analysis of a core recovered from the Dongsha area of the RSRF and includes downcore sedimentary facies analysis,14 C dating, grain-size composition including end-member modeling analysis, loss-on- ignition (LOI) values, magnetic susceptibility and an interpretation of the environmental implications of these parameters. By means of stratigraphic correlation between this core and three other cores from the sand ridge field, progressive environmental changes in the Dongsha area since MIS3 have been reconstructed. The results show that the Dongsha area evolved from a flood plain environment (60–25 ka BP), through a period of paleosol formation (25–12 ka BP), to the radial tidal sand ridge field of today (7 ka BP-present). The successions of depositional environments have mainly been controlled by sea-level fluctuations. From the data it can be concluded that the flood plain and tidal sand ridge environments were exposed to stronger hydrodynamic conditions than the paleosol environments. This study thus not only performed a paleoenvironmental reconstruction of the area, but also provided constraints for exploring regional land-sea interactions.