Abstract：Based on the analyses of grain size,pollen,AMS 14C ages etc.,the sedimentary environment and palaeoclimate of the late Quaternary sediments from core SE4 in the Qiantang River incised valley are discussed,and the specific process of sedimentary response to climate change mechanism is revealed. The results show that the late Quaternary sediments in core SE4 consist of five sets of depositional units from bottom to top,including fluvial channel,floodplain,palaeo-estuary,neritic deposits,and modern estuary. The palaeovegetation and palaeoclimate evoluiton of the study area since late Quaternary can be divided into six stages. The first stage is characterized by a mixture of coniferous and broadleaf forest-grassland dominated by broadleaf trees,indicating a mild-humid climatic phase,during which the fluvial channel and floodplain deposits were deposited. The second stage is also represented by a mixture of coniferous and broadleaf forest,but with slightly more deciduous vegetation,suggesting a mild and humid climatic phase,during which palaeo-estuarine and part of shallow marine deposits were deposited. The third stage is dominated by a mixture of coniferous and broadleaf forest,indicating a warm and humid climatic phase when some other shallow marine deposits were formed. From the fourth to sixth stage when modern estuary developed,the vegetation types experienced a transition from coniferous and broadleaf forest-grassland,through coniferous and broadleaf forest,to coniferous and broadleaf forest-grassland,suggestive of a palaeoclimatic shift from mild-dry,through mild-humid,back to mild-dry conditions.
Xia Chang-Fa,Zhang Xia,Lin Chun-Ming et al. Sedimentary environment and palaeoclimate evolution of the late Quaternary from core SE4 in Qiantang River incised valley[J]. JOPC, 2022, 24(3): 433-448.
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