• 责任者：Li Qing (Key Laboratory of Coast and Island Development ; Nanjing University ; Nanjing 210093 ; China) ; Yin Yong
• 刊名：Geographical Research
• 出版年：2013
• 卷期：32(10)
• 关键词：海洋沉积物 ; marine sediments ; 南黄海盆地 ; South Yellow Sea Basin
• 页码：p.1843-1855
• 图表：8 illus., 3 tables, 29 refs.
• 分类号：0200
• issnNo：ISSN1000-0585
• isbnNo：CN11-1848/P

     The South Yellow Sea is a semi-closed shallow epicontinental sea with an average water depth of 46 m. On offshore area, a characteristic tidal radial sand ridge system （TRSRS）, radiating perpendicularly or high angle oblique to the coastline, has developed under a complex tidal current field along the west coast of South Yellow Sea between the north of Yangtze River Delta and the abandoned south of Yellow River Delta. The study area is located in the eastern part of the TRSRS, where the main sandy ridges and associated channels extend in NS direction in outward part and switch to NNE in inner part and finally converge at the apex of Jianggang on land. Core llDT02, located on the southern slope of the Likejiao sandy ridge in the study area, suggests the long term sedimentary environment evolution since the last Pleistocene based on the sedimentary facies, grain- size, and AMS 14C and OSL datings. The results indicate that there are four types of sedimentary facies in the Core llDT02 from bottom to top： tidal flats （lower part）, terrestrial stiff mud, tidal flats （upper part） and tidal sand ridge. The tidal sand ridges and tidal flats are mainly composed of silt and fine sand, which show bed sorting. On the log-probability curves, they display 3 or 4 subpopulations, among which salutation subpopulation constitutes a high proportion. The double salutation population has been found from tidal sand ridge and tidal flat deposits.  The long term evolution of the core has shown that the study area was dominated by a broad tidal flat and followed by a subaerial exposure symbolized by ＂stiff mud＂ deposit, which has indicated a sea level decline. At the beginning of the Holocene transgression, the area received the tidal flat again. The tidal sand ridge-channel system has developed after the area was drowned completely due to high stand. The Holocene increasing tidal currents, which was strongly eroded and reworked underlying strata after 7 ka BP, might result in the formation of sand ridges.