Geochemical characteristics and geological significance of major elements of surface sediments from Changjiang River Estuary

MI Bei-bei, LAN Xian-hong, ZHANG Zhi-xun, LIU Sheng-fa

Journal of Marine Sciences ›› 2014, Vol. 32 ›› Issue (1) : 82-89.

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Journal of Marine Sciences ›› 2014, Vol. 32 ›› Issue (1) : 82-89. DOI: 10.3969/j.issn.1001-909X.2014.01.010

Geochemical characteristics and geological significance of major elements of surface sediments from Changjiang River Estuary

  • MI Bei-bei1, LAN Xian-hong1, ZHANG Zhi-xun1, LIU Sheng-fa2
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Abstract

Major elements (SiO2, Al2O3, Fe2O3, MgO, CaO, Na2O, K2O, P2O5, TiO2, MnO, TOC and CaCO3) of 187 surface sediments from Changjiang River Estuary have been tested to analyze the spatial distribution character and geological significance. The results indicate that the major element oxides are mainly composed of SiO2, Al2O3, Fe2O3, MgO, CaO, Na2O, K2O and TiO2, which account for 91.59%. SiO2 has the highest content in this area with the average content up to 62.43% . Al2O3 has the second highest content of 11.16%. R-factor analysis indicates that the major element oxides of surface sediments can be classified into three groups: the first group includes SiO2, Al2O3, Fe2O3, MgO, P2O5, TiO2 and MnO; the second group includes CaO, K2O, CaCO3 and TOC and the third one includes Na2O, which possibly represent the terrigenous sediment, the mixture of marine biologic sediment and terrigenous sediment, as well as the marine chemical sediment. Similar spatial distribution of Al2O3/Na2O and CIA indicates that the materials are mainly derived from Changjiang River and accumulated in the estuary and its southern area, especially in the west of 123.5°E area. The main driving force is Min-Zhe Coastal Current in the study area.

Key words

Changjiang River Estuary / sediment / major element / R-factor analysis

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MI Bei-bei, LAN Xian-hong, ZHANG Zhi-xun, LIU Sheng-fa. Geochemical characteristics and geological significance of major elements of surface sediments from Changjiang River Estuary[J]. Journal of Marine Sciences. 2014, 32(1): 82-89 https://doi.org/10.3969/j.issn.1001-909X.2014.01.010

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