Grain size distribution of modern tidal flat sediments at the Yangtze River mouth and its application to identification of sedimentary facies
Zhao Ya′nan1, Wang Zhanghua1, Wu Xuxu2, Li Lin2, Zhan Qing3, Chen Ting1
1 State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200062 2 School of Geographic Sciences,East China Normal University,Shanghai 200062 3 Shanghai Institute of Geological Survey,Shanghai 200072
Abstract This study takes detailed analyses on the sediment grain size for six cores from the modern tidal flats of Yangtze River mouth,to draw the diagnostic indexes for recognization of tidal flat facies in the study area. We also examined the grain size of a Holocene Borehole SL67 from the southern Yangtze delta plain so that to apply the sensitive indexes derived from modern sediments. Results demonstrate that the cohesive sediment(<8μm)and coarse silt(32～63μm)could be the sensitive indexes for distinguishing upper and middle tidal flats. Sand(＞63 μm) and fine silt(8～32μm)components differ obviously for the middle and lower tidal flats of open coast. Results also show that the parameter mode derived from grain size frequency curves is an effective index to help identify the upper,middle and lower tidal flat sediments. Above sensitive sediment components and mode were applied to identify the successions of tidal flat in Holocene Borehole SL67,which revealed the mechanism of sea level change and an acceleration of sea level rise around 7.5 cal ka BP.
About author: Zhao Ya′nan,born in 1990,is a master candidate in the State Key Laboratory of Estuarine and Coastal Research,East China Normal University. She majors in marine geology. E-mail: yingnan7_7@126.com. About the corresponding author Wang Zhanghua,is a professor and engaged in the study of environmental change of estuary and delta. E-mail: zhwang@geo.ecnu.edu.cn
Cite this article:
Zhao Ya′nan,Wang Zhanghua,Wu Xuxu et al. Grain size distribution of modern tidal flat sediments at the Yangtze River mouth and its application to identification of sedimentary facies[J]. JOPC, 2015, 17(3): 405-416.
Zhao Ya′nan,Wang Zhanghua,Wu Xuxu et al. Grain size distribution of modern tidal flat sediments at the Yangtze River mouth and its application to identification of sedimentary facies[J]. JOPC, 2015, 17(3): 405-416.
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