Sedimentary sequence and distribution pattern of filling in Qiantang River incised valley
Zhang Xia1, Lin Chunming1, Gao Shu2, Robert W.Dalrymple3, Qu Changwei1, Yin Yong2, Li Yanli1, Zhou Jian1
1 State Key Laboratory for Mineral Deposits Research,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210093,Jiangsu
2 Key Laboratory for Coast and Island Development,Ministry of Education,Nanjing University,Nanjing 210093,Jiangsu
3 Department of Geological Sciences and Geological Engineering,Queen's University,Kingston,Ontario K7L3N6,Canada
The present day Qiantang River(QR)estuary is a worldfamous tidedominated estuary，and is one of the most sensitive areas for postglacial global sealevel changes in China.Filling of the QR incised valley was initiated by marine inundation during the transgression after the Last Glacial Maximum and has continued during the Holocene sealevel stillstand.From bottom to top it could be grouped into five sedimentary facies: Fluvial channel，floodplain，paleoestuary，offshore shallow marine，and presentday estuary.The QR incised valley deposits occur as a relatively complete type I sequence with the sequence boundary，initial flooding surface，maximum flooding surface，tidalravinement surfaces and tidalerosion surfaces welldeveloped.Filling of the QR incised valley consists of four longitudinal segments: Seaward segment，offshore segment，the third segment and innermost segment，each of which is characterized by a distinct stratigraphic succession，and different degrees of marine and fluvial influences.This is the first time the paleoestuary facies has been recognized，formed about 9000 a BP. It has a distinct sedimentary succession from the presentday estuary，and is characterized by a large number of tidalchannel sand bodies flanked by mudflats and saltmarshes in the landward part of estuary，passing headward into the tidalfluvial channel.The presentday estuary is mainly composed of baymouth sediments，as well as a complex of tidal sand ridges and channels at the mouth，followed headward by a silty bar，which passes landward to a single tidalfluvial channel.The sediments of paleoestuary present a coarse-fine-coarse seaward pattern.By comparison，the deposits of presentday estuary show a coarse-fine-coarse-fine pattern from land to the sea，which is in general similar to the grainsize distribution in tidedominated estuaries，but a significant difference exists in that the baymouth sediments of the presentday estuary are muddominated.
Corresponding Authors:
About the corresponding author Lin Chunming,born in 1964,is a professor in School of Earth Sciences and Engineering,Nanjing University,with main research interest in sedimentology.E-mail:cmlin@nju.edu.cn.
About author: Zhang Xia,born in 1985,is a research assistant in School of Earth Sciences and Engineering,Nanjing University,with main research interest in sedimentology. E-mail:zhangxiananjing@163.com.
Cite this article:
Zhang Xia,Lin Chunming,Gao Shu et al. Sedimentary sequence and distribution pattern of filling in Qiantang River incised valley[J]. JOPC, 2013, 15(6): 839-852.
Zhang Xia,Lin Chunming,Gao Shu et al. Sedimentary sequence and distribution pattern of filling in Qiantang River incised valley[J]. JOPC, 2013, 15(6): 839-852.
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