| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
CHENG Haiyan, JIANG Shenghui, ZHANG Chao, ZHAO Dongdong. GEOCHEMICAL CHARACTERISTICS OF SURFACE SEDIMENS IN BOHAI STRAIT AND CONTROLLING FACTORS[J]. Marine Geology Frontiers, 2020, 36(8): 19-28. doi: 10.16028/j.1009-2722.2020.015
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GEOCHEMICAL CHARACTERISTICS OF SURFACE SEDIMENS IN BOHAI STRAIT AND CONTROLLING FACTORS
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Abstract
Based on the grain size data of surface sediments collected at 412 stations and the geochemical data from 123 stations in the Bohai Strait, we discussed in this paper the spatial distribution pattern of elements, elements correlation, element assemblages, sedimentary dynamic environment and sediment transportation mechanism of the surface sediments, aiming at revealing the environmental significance of sediment geochemistry. The results indicate that the major elements of the surface sediments in the study area are predominated by SiO2 and Al2O3. The content of SiO2 increase and Al2O3 decrease gradually with the increase in grain size of sediments. The highest trace element in the surface sediments is Ba. The element enrichment factors of the sediments from the study area also indicate that the distribution of element content is controlled by the grain size of sediments. The results of cluster analysis further suggest that the spatial distribution of elements in the study area could be subdivided into 5 areass, namely, the relict deposits area, the Laotieshan area, the east and west sides of the watercourse, the central area of the Straits and the southern part of the Straits.
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Keywords:
- surface sediments /
- grain size /
- geochemistry /
- trace elements /
- major elements /
- Bohai Strait
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References
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CHENG Haiyan, JIANG Shenghui, ZHANG Chao, ZHAO Dongdong. GEOCHEMICAL CHARACTERISTICS OF SURFACE SEDIMENS IN BOHAI STRAIT AND CONTROLLING FACTORS[J]. Marine Geology Frontiers, 2020, 36(8): 19-28. doi: 10.16028/j.1009-2722.2020.015
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Figure 1.
Site map of sampling stations for surface sediments and chemical elements
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Figure 2.
Distribution map of sediment types in the study area
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Figure 3.
Comparison of the major element composition of the area and its relationship with sediment types
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Figure 4.
Comparison of trace element composition of the area and its relationship with sediment types
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Figure 5.
Variation trend of relative content of major elements in different sediment types
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Figure 6.
Trend of relative content of trace elements in different sediment types
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Figure 7.
Contour map of CIA index in the study area
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Figure 8.
R-type cluster analysis pedigree of chemical element content in surface sediments
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Figure 9.
Geochemical areas of surface sediments in the Bohai Strait
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Figure 10.
Content map of major elements in each geochemical area
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Figure 11.
Content map of trace elements in each geochemical area