The core-recorded strata and environmental changes since the Late Pleistocene in Kushuiyang area of the radial tidal sandy ridge system, <br>Jiangsu offshore, southern Yellow Sea <br><br>

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Journal of Nanjing University(Natural Sciences) ›› 2015, Vol. 51 ›› Issue (3) : 641.

The core-recorded strata and environmental changes since the Late Pleistocene in Kushuiyang area of the radial tidal sandy ridge system,
Jiangsu offshore, southern Yellow Sea

Ji Yun1,Yin Yong1*, Li Qing1,Wang Aihua2

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Abstract

Based on the analysis of sedimentary facies and corns correlationaugmented by the characteristics of grain size, Sr/Baratio as an environmental indicator and mineral analysis,the corn strata, from the bottom to top were divided into five sedimentary sequences:SU1(low-mid intertidal flat→high intertidal flat), SU2(low-mid intertidal flat→high intertidal flat)，SU3(river-floodplain)，SU4(littoral marsh and tidal flat) and SU5(sand ridge- tidal channel complex).The correlation demonstrates that due to the tidal erosion during the process of transgression, stratigraphic distribution is very uneven in Kushuiyang area, especially for the early Holocene deposits which were eroded thoroughly with little left.Combined with data of AMS 14C and OSL, the process of environmental changes was reconstructed in the Kushuiyang area since Late Pleistocene.In addition to the land exposure in the last glacial maximum, the study area has been controlled by the tides. In MIS3,It developed into tidal flat and later tidal sand ridge during high stand of the Holocene.The main reason for young ages of sand ridges was the frequent migration, so that the deposits have been renewed in an order of 102 a. In the research area, the environmental changes and stratum structure are mainly controlled by the sea-level changes and tidal erosion during transgression since the LatePleistocene.

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Ji Yun1,Yin Yong1*, Li Qing1,Wang Aihua2. The core-recorded strata and environmental changes since the Late Pleistocene in Kushuiyang area of the radial tidal sandy ridge system,
Jiangsu offshore, southern Yellow Sea

[J]. Journal of Nanjing University(Natural Sciences), 2015, 51(3): 641

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