Spatial variability in alkaline earth metals of surface sediments from the Jiulong River mouth, Southeast China: implications for hydro-sedimentary dynamic processes and sedimentary facies

Dadong Pan; Zhanghua Wang; Aijun Wang; Fengling Yu; Xinru Zhu; Xun Yang; Honghong Li; Xiuzhi Chen; Shuyu Li

doi:10.1007/s13131-024-2434-4

Volume 43 Issue 11

Nov. 2024

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Dadong Pan, Zhanghua Wang, Aijun Wang, Fengling Yu, Xinru Zhu, Xun Yang, Honghong Li, Xiuzhi Chen, Shuyu Li. Spatial variability in alkaline earth metals of surface sediments from the Jiulong River mouth, Southeast China: implications for hydro-sedimentary dynamic processes and sedimentary facies[J]. Acta Oceanologica Sinica, 2024, 43(11): 57-67. doi: 10.1007/s13131-024-2434-4

Citation:

Dadong Pan, Zhanghua Wang, Aijun Wang, Fengling Yu, Xinru Zhu, Xun Yang, Honghong Li, Xiuzhi Chen, Shuyu Li. Spatial variability in alkaline earth metals of surface sediments from the Jiulong River mouth, Southeast China: implications for hydro-sedimentary dynamic processes and sedimentary facies[J]. Acta Oceanologica Sinica, 2024, 43(11): 57-67. doi: 10.1007/s13131-024-2434-4

Citation:

Dadong Pan, Zhanghua Wang, Aijun Wang, Fengling Yu, Xinru Zhu, Xun Yang, Honghong Li, Xiuzhi Chen, Shuyu Li. Spatial variability in alkaline earth metals of surface sediments from the Jiulong River mouth, Southeast China: implications for hydro-sedimentary dynamic processes and sedimentary facies[J]. Acta Oceanologica Sinica, 2024, 43(11): 57-67. doi: 10.1007/s13131-024-2434-4

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Spatial variability in alkaline earth metals of surface sediments from the Jiulong River mouth, Southeast China: implications for hydro-sedimentary dynamic processes and sedimentary facies

doi: 10.1007/s13131-024-2434-4

Dadong Pan^{1
,
,},
Zhanghua Wang^{2
,
,},
Aijun Wang^{3, 4, 5},
Fengling Yu⁶,
Xinru Zhu¹,
Xun Yang¹,
Honghong Li¹,
Xiuzhi Chen⁷,
Shuyu Li¹

1.
School of History and Geography, Minnan Normal University, Zhangzhou 363000, China
2.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
3.
Laboratory of Coastal and Marine Geology, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
4.
Fujian Provincial Key Laboratory of Marine Physical and Geological Processes, Xiamen 361005, China
5.
Observation and Research Station of Island and Costal Ecosystem in the Western Taiwan Strait, Ministry of Natural Resources, Xiamen 361005, China
6.
College of Ocean and Earth Sciences and State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
7.
College of Chemistry, Chemical Engineering and Environment, Minnan Normal University, Zhangzhou 363000, China

Funds: The National Natural Science Foundation of China under contract Nos 42476156, 41961144022; the Natural Science Foundation of Fujian Province, China under contract No. 2023J01927; the College Students’ Innovation and Entrepreneurship Training Program of Fujian Province, China under contract No. S202310402032; the Scientific Research Foundation of the Third Institute of Oceanography, SOA, China under contract No. 2019018.

More Information

Corresponding author: dadongdedou@163.com; zhwang@geo.ecnu.edu.cn
Received Date: 2023-11-15
Accepted Date: 2023-12-15

Available Online: 2024-11-27

Publish Date: 2024-11-25

Abstract

Abstract

The establishment of effective proxies for the differentiation of sedimentary facies in the tide-dominated river mouth is fundamental to the delineation of stratigraphy and the study of paleoenvironments. Geochemical signatures of the acetic acid (HAc) extractive phases of alkaline earth metals, such as Sr, Ba, and Ca, are closely related to sedimentary environments and thus provide a novel method for discriminating the sedimentary facies of river mouth. In this study, 50 surface water and surface sediment samples were obtained from different geomorphological units of the Jiulong River mouth, i.e., river channel, distributary channel, delta front, delta front slope, prodelta, and shallow marine area, and the salinity of the water, the grain size, and the Sr, Ba, and Ca contents and Sr/Ba molar ratio (Sr/Ba) in HAc leachates of the sediments were determined. Contents of alkaline earth metals in HAc leachates of surface sediments from the Changjiang (Yangtze) River coast were also collated. The goals of this study were to reveal the spatial distribution of alkaline earth metals in the Jiulong River mouth, define their depositional mechanisms, and search for effective geochemical proxies for identification of the various sedimentary facies in the fluvial to marine transition zone. The results revealed several land-to-sea gradients. The Ba content decreased rapidly from the distributary channel to the sea, and the Sr and Ca contents and Sr/Ba increased gradually with the increase in salinity. Salinity, marine biomass, and sedimentary dynamic processes, were speculated to be the main reasons for the differences in their spatial distributions. There were significant differences in Ba, Sr, Ca, and Sr/Ba between the river channel and the distributary channel, in Ca and Ba between the distributary channel and the delta front (slope), and in Sr, Ca, and Sr/Ba between the delta front (slope) and the prodelta–shallow marine region. The Sr–Ba scatterplot showed that the sediments of the river channel and alluvial plain were located as a high Ba and low Sr element-defined end-member, whereas samples of the prodelta and shallow marine formed a high Sr and low Ba end-member. These can be used as characteristic end-members indicating terrestrial facies and marine facies, respectively. The sediments of the delta plain, tidal river, distributary channel, delta front, and delta front slope are located between these two end-member regions of the scatterplot, and this region of the diagram can be used to identify land–sea transitional sedimentary facies.
- Sr-Ba,
- sedimentary facies,
- tide-dominated river mouth,
- end-member,
- salinity

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