Formation & Sedimentary Characteristics of the Yangtze River Incised-Valley in Nanjing
Formation & Sedimentary Characteristics of the Yangtze River Incised-Valley in Nanjing
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发表时间：
2006
期刊：
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通讯作者：
C. Guang-jie;W. Jian;QU Gui-xian
中科院分区：
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作者：
C. Guang-jie;W. Jian;QU Gui-xian
During the last glaciation maximum,the Yangtze river developed deep incised-valley due to the strong fall of the sea-level.In conclusion,the deep incised-valley in the stratigraphical cross-section was brush-fire.The Yangtze river incised-valley fill in Nanjing is divided into three depositional rhythms of sediment from coarseness to finesse on the basis of the sedimentary grain.During the last glaciation maximum,the deep incised-valley channel bed was narrow and the water discharge decreased.The flow velocity was swift and the sedimentary grain was coarse from gravels to medium,fine sands.During the post-glacial period,the water increased and the sediment ranged from gravel,coarse sands medium sands to fine sands.During Holocene Epoch,the river widened fatherly.The flow velocity became slowly.The sediment including gravels,coarse sands,medium sands and fine sands deposited in great quantities.The fine sandy laminae was very thick.The river bed configuration and the sedimentary characteristics in different stages reflected the climate change and environmental evolution during the last glaciation maximum,the post glacial period and the Holocene.
