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

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- 文章访问数: 52
- PDF下载量: 16
- 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

Isotopic composition and significance of Sr and Nd isotopes in surface sediments of Yangtze River Estuary and adjacent sea areas

1.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Wuhan), Wuhan 430074, China
2.
Coal Industrial Planning Institute Corporation, 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。海水与河水混合区域的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。研究成果展现了长江口和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。
- 长江河口 /
- 表层沉积物 /
- Sr、Nd同位素 /
- 海陆交互作用 /
- SIMMR多元混合模型
Abstract:
The Yangtze River Estuary is a crucial hub connecting land and ocean, characterized by its complex topography, abundant terrestrial material supply, and significant interaction with human activities, making it a focal point of scholarly attention. Research on the surface sediments of the Yangtze River Estuary and its adjacent seas provides comprehensive insights into the sedimentary environment and source-sink processes in this region, offering valuable information for understanding surface material cycles and exploring marine environmental evolution. This study focuses on the surface sediments of the seabed in the Yangtze River Estuary and its adjacent areas, systematically analyzing the geochemical behavior of Sr and Nd isotopes as well as trace elements. The results reveal that the sediments in the estuary and adjacent seas are primarily composed of terrestrial materials, with the majority originating from the Yangtze River Basin, and a portion from the ancient Yellow River Delta. Nd enrichment in the river-sea mixing zone is attributed to colloidal coagulation, while the complex hydrodynamic conditions lead to finer sediment particle sizes, and Sr exhibits significant depletion. Through the SIMMR (stable isotope mixing models in R) multi-source mixing model analysis, it was found that the contribution of materials from the middle and lower reaches of the Yangtze River to the surface sediments in the land-sea interaction zone has increased. The construction of dams in the upper reaches has significantly reduced sediment supply, turning the middle and lower reaches from a "sink" of sediment into a "source," thereby increasing their contribution to the estuary and adjacent seas. Despite this, materials from the upper Yangtze River still dominate the sediment composition in the estuary.
- Yangtze River Estuary /
- surface sediments /
- Sr and Nd isotopes /
- sea-land interaction /
- SIMMR multi-source mixing model

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

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图 2 采样点分布的示意图^[7]

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

Figure 2. Schematic diagram of the distribution of sampling points

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图 3 长江口及邻近海域沉积物样本的树状图

Figure 3. Dendrogram of sediment samples from the Yangtze River estuary and adjacent sea areas, showing three clusters.

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图 4 ⁸⁷Sr/⁸⁶Sr 与w（Sr）的关系图(a)和ε_Nd(0) 与 w（Nd）的关系图(b)

Figure 4. (a) Plot of Sr isotope ratio ⁸⁷Sr/⁸⁶Sr against Sr mass fraction； (b) Plot of _εNd(0) against Nd mass fraction.

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图 5 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

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

Figure 6. The Relationship between Sr Isotopes and Grain Size in Surface Sediments of the Yangtze River Estuary and Adjacent Seas (a); The Relationship between Nd Isotopes and Grain Size (b)

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

Figure 7. Sr and Nd isotope indication sources in the Yangtze River Estuary and adjacent sea areas

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图 8 SIMMR模型计算长江口及邻近海域表层沉积物来源的相对贡献^{[4-5，11，16，20，32]}

Figure 8. The relative contributions of surface sediment sources in the Yangtze River estuary and adjacent sea areas were 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判别图^[11，20]

Figure 9. La-Th-Sc discriminant map of surface sediments in the Changjiang Estuary and adjacent sea areas

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

Figure 10. The comparison chart of Zr/Th and Nb/Y in the surface sediments of the Yangtze River Estuary and adjacent sea areas

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表 1 旋转因子载荷矩阵

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

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