Postglacial sequence stratigraphy and sedimentary environment evolution of the Yangtze River subaqueous delta
Su Jianfeng1, 2, Fan Daidu1, 3, Leng Wei1, Chen Lingling1, Yin Ping4
1 State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092; 2 State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200062; 3 School of Geoscience,Yangtze University,Wuhan 430100,Hubei; 4 Qingdao Institute of Marine Geology,Qingdao 266071,Shandong
Abstract Sequence stratigraphic research of the Yangtze River subaqueous delta is conducive to a comprehensive understanding of the Yangtze River delta stratigraphic characteristics and sedimentary environment evolution model. Detailed analyses of grain-size compositions,sedimentary facies and elemental ratios(Cl/Ti、Zr/Rb)of cores from Boreholes YD0901 and YD0903 located at the Yangtze paleo-incised valley establish the postglacial period high-resolution stratigraphic framework of the Yangtze River subaqueous delta.The postglacial facies associations in the Yangtze River delta(YRD)are vertically stacked from fluvial facies at the bottom,through tidal-river facies,estuarine facies,and shallow-marine facies,to deltaic facies at the top. Since the Last Glacial period sea-level began to decline,and the incised valley of ancient Yangtze River developed. Stiff clay on the interfluve of the incised valley constitutes the Ⅰ-type sequence boundary. After then the sea-level began to rise,the regression and transgression reached its maximum in 15 cal ka BP and 8.0 cal ka BP respectively,and the time of maximum transgression at subaqueous delta slightly lagged behind the plain area which is about 7.5 cal ka BP. According to these three sequence boundaries,the strata were divided into lowstand system tracts(LST),transgressive system tracts(TST)and highstand system tracts(HST). Based on AMS14C dating results,post-LGM (Last Glacial Maximum)transgression reached the coring area roughly in 14.8 cal ka BP. The rate of shoreline retreatment was up to 71.9,km/ka,resulting from rapid sea-level rise by the MWP(Meltwater Pulse)-1A event in 14.8~13cal ka BP. In the early regression period,the deposition rate of the boreholes was low. It increased significantly since 2 cal ka BP.
Fund:[Co-funded by the National Natural Science Foundation of China(No.41476031),Ph.D.Programs Foundation of Ministry of Education of China(No.20130072130003),Research Fund for Marine Geological Protection(No.GZH201100203),International Cooperation Project of the State Oceanic Administration(No.GASI-GEOGE-02)and State Key Laboratory of Estuarine and Coastal Research Opening Project,East China Normal University(No.SKLEC-KF201506)]
Corresponding Authors:
Fan Daidu,born in 1972,is a professor of sedimentology at Tongji University. E-mail: ddfan@tongji.edu.cn.
About author: Su Jianfeng,born in 1989,is a master candidate of marine geology at Tongji University. E-mail: 385715061@qq.com.About the corresponding author Fan Daidu,born in 1972,is a professor of sedimentology at Tongji University. E-mail: ddfan@tongji.edu.cn.
Cite this article:
Su Jianfeng,Fan Daidu,Leng Wei et al. Postglacial sequence stratigraphy and sedimentary environment evolution of the Yangtze River subaqueous delta[J]. JOPC, 2017, 19(3): 541-556.
Su Jianfeng,Fan Daidu,Leng Wei et al. Postglacial sequence stratigraphy and sedimentary environment evolution of the Yangtze River subaqueous delta[J]. JOPC, 2017, 19(3): 541-556.
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