Geochemical characteristics of Quaternary sediments of typical borehole XJ01 in ancient Yellow River Delta
The ancient Yellow River Delta in Jiangsu is a typical area for the study of global land-sea interac-tion.The study of the evolution of the Quaternary sedimentary environment can better understand the characteristics of land-sea changes and climate change.This paper uses the geochemistry of major and trace ele-ments in the Quaternary sediments of the typical XJ01 borehole to conduct sedimentary environment tracing research.The results show that Al2O3,Fe2O3,FeO,MgO,CaO,MnO,P2O5,and TiO2 are negatively correlated with SiO2.In the geochemical element curves in the borehole,the change trends of CIA,SiO2/Al2O3,SiO2/(Al2O3+Fe2O3),and SiO2/(K2O+Na2O+CaO+MgO)are basically consistent,and the change trends of trace elements Be,Rb,Cr,and Cu are basically consistent with Rb/Sr.The geochemical element curve shows that the sediments in the borehole are divided into 10 zones,which reflect the frequent alternation of the Quaternary sedimentary environ-ment from reduction to oxidation,the water environment from deep water to shallow water,the sedimentary phase from continental to marine,and the paleoclimate from humid and hot to dry and cold.The research results provide basic geological data for presenting the Quaternary geological evolution process in the ancient Yellow River Delta area.
ancient Yellow RiverDeltaQuaternarygeochemistrysedimentary environment
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