Constituents of Matter and Sedimentation Fluxes and Sedimentation Rates of Deep-water Sedimentation during the Late Pleistocene in the South China Sea
ZHANG Wei yan 1 ZHANG Fu yuan 1 CHEN Rong hua 1 ZHANG Xiao yu 2 1 (Second Institute of Oceanography,SOA,Key Lab of Submarine Science,SOA, Hangzhou 310012 2 (Department of the Earth Science, Zhejiang University, Hangzhou 310012)
Based on the integrated study of sediment cores in the South China Sea, the sedimentation rates feature during the Late Pleistocene has been shown.(1) On the whole, the rates of glacial stages is 1.3～1.6 times for the interglacials.(2)Trend analysis on the sedimentation rate is performed, which indicates that the rates of cores during δ 18 O Stage 1 were high in the northeastern and south western continental slope. The features resulted from trend analysis were the main controlling factors of the river distribution, monsoon and ocean current etc. The sedimentation rates of cores during δ 18 O Stage 2 and 3 were similar, which were different from that of during δ 18 O Stage 1, only that were high on the northeastern continental slope. So the sediment environment in the South China Sea was significantly modified after the δ 18 O Stage 2. Based on the study of sediment cores in the Eastern South China Sea, the constituents of the main matter and sedimentation fluxes feature were obtained.(1)From the last glacial stage, the sedimentation fluxes on the northern continental slope were higher than that of the deep basin.(2) The sedimentation fluxes of silicon organic substances during the glacial stage were higher than that of the interglacials.(3)From the last glacial stage, the terrigenous constituents were 44% above in the abyssal plains sediments.