Development of Sedimentary Environment in the Northeastern South China Sea Since the Last Glacial Stage

摘要

Core D (21°23′02″N, 116°47′13″E, water depth 405 m) was sampled from the upper slope from the northeastern South China Sea (SCS) and applied to analyze the sedimentary environmental change in this sea area since the last glacial stage. The results of grain size analysis, diatom analysis and detrital mineral analysis were well matched. We divided the core D into two layers. The surface sand layer (0 - 2 cm) consisted of residual sediments, which might be originally the sediment in the late Pleistocene and later suffered from being transformed in the post glacial transgression. The lower layer (2-130 cm) was quite different from the surface one, which might mainly result from a neritic sedimentary environment in the last glacial stage. Two sedimentary cycles could be detected in the core D: regression during Marine isotope stage (MIS) 4 to transgression during MIS 3 and regression during MIS 2 to transgression during the post glacial.