长江口及邻近海域表层沉积物Sr、Nd同位素组成及意义

李宇峰; 刘金存; 刘金华; 胡雅婷; 李百蝉; 周炼

doi:10.19509/j.cnki.dzkq.tb20240401

长江口及邻近海域表层沉积物Sr、Nd同位素组成及意义

doi: 10.19509/j.cnki.dzkq.tb20240401

1.
中国地质大学（武汉）地质过程与成矿预测全国重点实验室，武汉 430074
2.
煤炭工业规划设计研究院有限公司，北京 100120

基金项目: 国家自然科学基金项目（42273014；41673013；NORC2015-03）

详细信息

作者简介:
李宇峰：E-mail：liyufeng996@163.com

通讯作者:
E-mail：zhcug@163.com

中图分类号: P736.21
计量
- 文章访问数: 103
- PDF下载量: 26
- 被引次数: 0
出版历程
- 收稿日期: 2024-07-16
- 录用日期: 2024-10-21
- 修回日期: 2024-10-17
- 网络出版日期: 2025-12-15

Sr and Nd isotopic compositions and their significance of surface sediments in the Yangtze River Estuary and its adjacent seas

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan), Wuhan 430074, China
2.
Coal Industrial Planning Institute Co., Ltd., Beijing 100120, China

More Information

Author Bio:
E-mail：liyufeng996@163.com

Corresponding author: E-mail：zhcug@163.com

摘要

摘要:
长江口是连接陆地和海洋的重要枢纽，因其复杂的地形、丰富的陆源物质以及与人类活动的紧密联系，受到学者们的广泛关注。以长江口及其邻近海域海底表层沉积物为研究对象，系统分析了Sr、Nd同位素以及微量元素的地球化学行为。结果表明，长江口及邻近海域沉积物主要由陆源物质构成，源自长江流域的沉积物占据主导地位，部分物质来自古黄河三角洲。海陆交互区域的Nd元素由于胶体凝聚现象显著富集，而复杂的水动力条件导致该区域的沉积物粒径较细，Sr元素则表现出明显的贫化。通过基于R语言的稳定同位素混合模型（SIMMR）分析，发现长江中下游对海陆交互区域表层沉积物的贡献有所增加。长江上游的物质由于大坝建设被大量截留，导致中下游河道从沉积的“汇”转变为泥沙供应的“源”，从而增加了中下游物质对河口及邻近海域沉积物的贡献。尽管如此，长江上游物质仍在长江口沉积物中占据主导地位。研究成果揭示了长江口及邻近海域的沉积环境和源汇过程，为揭示地表物质循环过程、探究海洋环境演化提供重要信息。
- 长江口 /
- 表层沉积物 /
- Sr、Nd同位素 /
- 海陆交互作用 /
- 基于R语言的稳定同位素混合模型（SIMMR）
Abstract: <p>The Yangtze River Estuary is a vital hub linking the land and the ocean. Due to its complex topography, abundant terrestrial materials, and close association with human activities, it has attracted extensive attention from researchers. </p></sec><sec><title>Methods
Focusing on the surface sediments in the Yangtze River Estuary and its adjacent seas, this study systematically analyzed the geochemical behavior of Sr and Nd isotopes as well as trace elements.
Results
The results showed that the sediments in the Yangtze River Estuary and its adjacent seas were mainly composed of terrestrial materials, dominated by sediments from the Yangtze River Basin, with a portion originating from the ancient Yellow River delta. In the river-sea mixing zone, Nd was significantly enriched due to colloidal coagulation, while complex hydrodynamic conditions resulted in finer sediment particle sizes, and Sr exhibited noticeable depletion. Through analysis using the stable isotope mixing model in R (SIMMR), it was found that the contribution of sediments from the middle and lower reaches of the Yangtze River to the surface sediments in the sea-land interaction zone increased. Sediments from the upper reaches of the Yangtze River have been largely trapped by dam construction, which has turned the river channels in the middle and lower reaches from a sediment "sink" into a sediment supply "source", thereby increasing their contribution to the sediments in the estuary and its adjacent seas. Nevertheless, sediments from the upper reaches of the Yangtze River still dominated the composition of sediments in the estuary.
Objective and Conclusion
The findings reveal the sedimentary environment and source-sink processes in the Yangtze River Estuary and its adjacent seas, providing crucial information for elucidating the surface material cycling process and exploring the evolution of the marine environment.
- Yangtze River Estuary /
- surface sediments /
- Sr and Nd isotopes /
- sea-land interaction /
- stable isotope mixing model in R (SIMMR)

HTML全文

图 1 长江流域地质背景图（据文献[21]修改）

Figure 1. Geological background map of the Yangtze River basin

下载: 全尺寸图片幻灯片

图 2 长江口及邻近海域采样点分布示意图（据文献[7]）

SBCC. 苏北沿岸流；CDW. 长江冲淡水；TWCC. 台湾暖流；ZMCC. 浙闽沿岸流

Figure 2. Schematic diagram of sampling points distribution in Yangtze River Estuary and its adjacent seas

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图 3 长江口及邻近海域沉积物样本聚类树状图

Figure 3. Dendrogram of sediment sample clustering from Yangtze River Estuary and its adjacent seas

下载: 全尺寸图片幻灯片

图 4 长江口及邻近海域表层沉积物⁸⁷Sr/⁸⁶Sr 与w（Sr）的关系图(a)和¹⁴³Nd/¹⁴⁴Nd与 w（Nd）关系图(b)

Figure 4. Plot of ⁸⁷Sr/⁸⁶Sr vs. w(Sr) (a) and plot of vs. ¹⁴³Nd/¹⁴⁴Nd and w(Nd) (b) in surface sediments of the Yangtze River Estuary and its adjacent seas

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图 5 长江口及邻近海域表层沉积物中Sr、Nd同位素及元素的空间分布

Figure 5. Spatial distribution of Sr, Nd isotopes and elements in surface sediments of the Yangtze River Estuary and its adjacent seas

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图 6 长江口及邻近海域表层沉积物中Sr同位素(a)和Nd同位素(b)与平均粒径的关系

Figure 6. Relationship between Sr isotopes and particle size (a) and relationship between Nd isotopes and average particle size (b) in surface sediments of Yangtze River Estuary and adjacent seas

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图 7 长江口及邻近海域表层沉积物Sr、Nd同位素指示来源^{[4-5，11，16，20，32]}

Figure 7. Sources indicated by Sr and Nd isotopes in surface sediments of the Yangtze River Estuary and its adjacent seas

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图 8 SIMMR模型计算的长江口及邻近海域表层沉积物物源相对贡献率图^{[4-5，11，16，20，32]}

Figure 8. Relative contributions rates of surface sediment provenances in the Yangtze River Estuary and its adjacent seas calculated by SIMMR model

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图 9 长江口及邻近海域表层沉积物的La-Th-Sc物源判别图^[11，20]

Figure 9. La-Th-Sc provenance discrimination map of surface sediments in the Yangtze River Estuary and its adjacent seas

下载: 全尺寸图片幻灯片

图 10 长江口及邻近海域表层沉积物的Zr/Th与Nb/Y物源对比图^[11，20]

Figure 10. Provenance comparison of Zr/Th and Nb/Y in surface sediments of the Yangtze River Estuary and its adjacent seas

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表 1 旋转因子载荷矩阵

Table 1. Rotated factor loading matrix

变量	因子1	因子2	因子3	因子4
⁸⁷Sr/⁸⁶Sr	0.79	0.29	0.33	0.38
¹⁴³Nd/¹⁴⁴Nd	−0.53	−0.04	−0.76	−0.15
w（Li）	0.91	0.30	0.24	−0.01
w（Be）	0.88	0.39	0.10	0.10
w（Na）	−0.91	−0.28	−0.23	0.04
w（Mg）	0.75	0.54	0.27	0.02
w（Al）	0.91	0.35	0.21	0.10
w（P）	0.49	0.75	0.18	0.23
w（K）	0.95	0.19	0.15	0.11
w（Ca）	0.38	0.24	0.53	−0.49
w（Sc）	0.84	0.50	0.21	0.06
w（Ti）	0.58	0.76	0.23	0.02
w（V）	0.83	0.52	0.11	0.16
w（Cr）	0.73	0.62	0.25	−0.02
w（Fe）	0.86	0.49	0.08	0.09
w（Co）	−0.42	−0.15	−0.54	−0.14
w（Ni）	0.88	0.43	0.17	0.10
w（Cu）	0.82	0.41	0.29	0.22
w（Zn）	0.80	0.31	0.25	0.04
w（Ga）	0.89	0.39	0.20	0.09
w（Ge）	0.83	0.50	0.09	0.08
w（Rb）	0.93	0.26	0.21	0.10
w（Sr）	−0.60	−0.24	−0.15	−0.66
w（Y）	0.55	0.71	0.38	0.14
w（Zr）	0.04	0.44	0.81	−0.23
w（Nb）	0.48	0.81	0.28	0.06
w（Mo）	0.81	0.45	0.12	0.17
w（Sn）	0.82	0.47	0.30	0.10
w（Cs）	0.90	0.31	0.27	0.06
w（Ba）	0.29	0.00	−0.16	0.79
w（La）	0.45	0.85	0.15	−0.09
w（Ce）	0.44	0.85	0.15	−0.11
w（Pr）	0.43	0.86	0.17	−0.07
w（Nd）	0.45	0.85	0.18	−0.06
w（Sm）	0.52	0.82	0.15	−0.01
w（Eu）	0.53	0.81	0.10	0.11
w（Gd）	0.51	0.81	0.25	0.06
w（Tb）	0.56	0.76	0.28	0.09
w（Dy）	0.57	0.73	0.32	0.11
w（Ho）	0.57	0.71	0.35	0.13
w（Er）	0.56	0.70	0.38	0.14
w（Tm）	0.58	0.69	0.37	0.12
w（Yb）	0.60	0.66	0.40	0.11
w（Lu）	0.58	0.65	0.43	0.11
w（Hf）	0.08	0.45	0.81	−0.21
w（Ta）	−0.32	0.76	−0.06	0.10
w（Tl）	0.92	0.27	0.24	0.06
w（Pb）	0.81	0.39	−0.03	0.28
w（Th）	0.72	0.62	0.25	−0.04
w（U）	0.16	0.85	0.20	−0.01

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