| 渤海沉积物中放射性核素分布及其对沉积环境变化的响应 |
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| 引用本文： | 杜金秋,王震,林武辉,路波,高会,王宇宁,姚子伟,关道明. 渤海沉积物中放射性核素分布及其对沉积环境变化的响应[J]. 地球科学, 2021, 46(12): 4503-4516. DOI: 10.3799/dqkx.2021.120 |
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| 作者姓名： | 杜金秋 王震 林武辉 路波 高会 王宇宁 姚子伟 关道明 |
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| 作者单位： | 1.国家海洋环境监测中心, 辽宁大连 116023 |
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| 基金项目： | 国家自然科学基金41807383河口海岸学国家重点实验室开放基金SKLEC-KF201712国家海洋局海洋沉积与环境地质重点实验室开放基金MASEG201709 |
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| 摘 要： | 为了探讨近百年来,人类活动背景下近海沉积物中放射性核素的沉积记录及其对物质输入与埋藏等沉积环境变化的响应,利用γ能谱法对渤海表层和柱状沉积物中的放射性核素238U、226Ra、232Th、210Pb、40K和137Cs进行分析.结果显示,渤海沉积物中放射性核素水平和垂直分布特征明显,铀衰变系核素238U、226Ra和2...
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| 关 键 词： | 放射性核素 沉积速率 渤海 沉积环境 演变 地球化学 |
| 收稿时间： | 2021-04-27 |
Distribution of Radionuclides in Sediments of Bohai Sea and Their Response to Changes in Sedimentary Environment |
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| Abstract: | In order to investigate the temporal and spatial changes of the offshore sedimentary processes such as terrestrial material input and sedimentation rate in the context of human activities during the past 100 years, the radionuclides 238U, 226Ra, 232Th, 210Pb, 40K and 137Cs in surface and column sediments in the Bohai Sea region were analyzed using γ energy spectrometry. The horizontal and vertical distribution characteristics of radionuclides in the sediments of the Bohai Sea were obvious, and the radionuclides 238U, 226Ra and 210Pb in the uranium decay series were unbalanced. 232Th and 210Pb were significantly affected by sediment grain size and organic carbon. The correlation between 238U and 226Ra, 232Th, 40K was obvious. There were significant temporal and spatial differences in the ratios of 226Ra/238U, 232Th/238U and 40K/238U. The influence of terrestrial input of Bohai Sea sediments extends from southwest to northeast. Affected by rivers, the sediments in the northern and southern Bohai Sea material input were unstable and fluctuated significantly in recent decades. The sedimentation rate calculated by the 210Pbex and 137Cs dating methods in the Bohai Sea in the past 100 years was within the background value of the sedimentation rate research in the offshore China. Spatially, the sedimentation rate was at the same level in the northern part, central part and southern part, among which it was relatively high in the northern part. Temporally speaking, the sedimentation rate of the Bohai Sea fluctuated with time in the past 100 years and showed an overall increasing trend, especially since 1980, under the influence of human activities, the increase was significant, corresponding to the changes in sediment input. |
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