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

doi:10.3969/j.issn.1001-909X.2014.01.010

Abstract

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% . Al₂O₃has 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, TiO₂and 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

CLC Number:

P736.4

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.

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