Citation: | CHEN Haitao, KONG Fanbiao, XU Shujian, LOU Zhaojun, ZHANG Junqiang. Geochemical characteristics of major elements and their paleoenvironmental significance of the Xianjingyuan loess in Shandong Province[J]. Marine Geology & Quaternary Geology, 2020, 40(6): 189-197. doi: 10.16562/j.cnki.0256-1492.2020060803 |
The loess deposited in the Miaodao Islands has great significance to the revealing of paleoclimatic and paleoenvironmental changes. In this study, we analyzed the compositional characteristics of the major elements of the Xianjingyuan loess on the Nanchangshan island. Combined with the chemical weathering indexes and integrated elemental parameters, we discussed in this paper the characteristics and intensity of chemical weathering and climate changes during the accumulation of Xianjingyuan loess. Also made are comparisons to the Tuoji loess, Pingyin loess and Luochuan loess-palaeosol. It is revealed that: (1) The Xianjingyuan loess is dominated by the major elements of SiO2, Al2O3 and CaO, and the abundance of major elements are in an order of SiO2>Al2O3>CaO>TFe2O3>K2O>Na2O>MgO>TiO2>P2O5>MnO; (2) Chemical weathering indicators indicated that the Xianjingyuan loess was in an initial stage of chemical weathering; and the integrated element parameters suggest that the region had experienced five times of climatic change from warm and humid to cold and dry, and the climate environment of Xianjingyuan has a good response to the global climate environment; (3) The dust sources and the paleoclimate environment are highly similar to the loess found in Shandong Province, but the regional environment was effected by geographic location and topographic conditions, the obvious difference between Xianjingyuan loess and Pingyin loess suggest that there is difference in dust sources; (4) the difference between the major elements and chemical weathering in Xianjingyuan loess and Luochuan loess-palaeosol owes its origin to the difference of dust sources.
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Location of the Xianjingyuan loess section, Shanong Province[24]
UCC normalized pattern of major elements of the Xiangjiangyuan loess and its comparison with Tuoji loess, Pingyin loess and Luochuan loess-paleoaol
The scatter diagram of CIA and Na/K molar ratio of Xiangjiangyuan loess, Tuoji loess, Pingyin loess and Luochuan loess-paleoaol
A-CN-K diagram of Xiangjiangyuan loess, Tuoji loess, Pingyin loess and Luochuan loess-paleoaol
Plots of SiO2-Al2O3(a), SiO2/Al2O3-TiO2/Al2O3(b)and TFe2O3-Al2O3(c)of Xiangjiangyuan loess, Tuoji loess, Pingyin loess and Luochuan loess-paleoaol
Variation of integrated element parameters of Xianjingyuan loess