Mechanism and genesis of Sanmen Bay as a sink of Holocene Yangtze River sediment, Zhejiang Province, China
编号:2557 访问权限:仅限参会人 更新:2024-04-12 15:02:07 浏览:294次 张贴报告

报告开始:2024年05月18日 08:24(Asia/Shanghai)

报告时间:1min

所在会场:[SP] 张贴报告专场 [sp6] 主题6、海洋地球科学

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摘要
The Holocene mud deposits that extend from the Yangtze River mouth to the Taiwan Strait along the Zhejiang–Fujian coast, East China Sea (ECS), have attracted considerable research attention. However, there is a lack of consensus regarding the redistribution flux of Yangtze River sediment after it enters the sea. There are many bays along the Zhejiang and Fujian coasts, but their role in the source–sink process of Yangtze River sediment is not well-documented owing to limited data. In this study, data from shallow seismic profiles, core samples, and surface sediment samples were analysed to assess the role of Sanmen Bay, the second largest bay in Zhejiang Province, in the source–sink process of Yangtze River sediments. The results showed that Sanmen Bay is an important sink for Yangtze River sediments. The characteristics of the clay minerals indicate that the fine-grained sediments in Sanmen Bay are mainly derived from Yangtze River sediments. The thickness of Holocene deposits in Sanmen Bay ranges from 8.2 to 32.0 m, with an average of 23.4 m and a total sediment volume of 5.06 × 104 Mt, accounting for 1% of Yangtze River sediment in this time period. The Bayesian age-depth model based on borehole accelerator mass spectrometry (AMS) 14C dating shows that a high sedimentation rate occurred in the early and late Holocene but decreased significantly in the mid-Holocene, which is similar to that of the inner shelf of the East China Sea (ECS). The variation in the Holocene sedimentation rate in Sanmen Bay is related to the southward transport process and mechanism of Yangtze River sediments. The results of this study provide a basis for understanding the source–sink process of sediment in large rivers.
关键词
Sanmen Bay, Holocene, Yangtze River, seismic profiles, sediment budget
报告人
仇建东
副研究员 青岛海洋地质研究所

稿件作者
仇建东 青岛海洋地质研究所
冯京 青岛海洋地质研究所
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重要日期
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    05月17日

    2024

    05月20日

    2024

  • 03月31日 2024

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  • 03月31日 2024

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  • 05月20日 2024

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青年地学论坛理事会
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厦门大学近海海洋环境科学国家重点实验室
中国科学院城市环境研究所
自然资源部第三海洋研究所
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