- 责任者：Cao Guangjie (Experiment Center ; Linyi University ; Linyi 276005 ; China) ; Zhang Yulan
- 刊名：Journal of Mountain Science
- 出版年：2011
- 卷期：29(2)
- 关键词：末次冰期 ; last glacial age ; 古河道 ; buried channels ; 长江 ; Yangtze River
- 页码：p.183-187
- 图表：2 illus., 1 table, 22 refs.
- 分类号：1400
- issnNo：ISSN1008-2786
- isbnNo：CN51-1516/P
The Xiaguan-Qixia Mountain of Nangjing reach of the Yangtze River was selected as the research reach. Two cross-sections of Paleo-valley depositional sequence were established with respective of bore data and documents of the No.1 and No.4 Nanjing Yangtze River Bridges and by Mapinfo software. Samples were collected from 6 drilling cores near No.4 Nanjing Yangtze River Bridge which is operational, and 14C ages measured in -59.33 m sedimentary samples from No.1 drilling cores is (14 682±110) a B.P. It is deduced that sedimentary cycle in the lower part of the depth occurred before 15 000 a B.P. Therefore, it is discovered that the time range of paleo-valley at a depth of -65～-90 m in Xiaguan-Qixia mountain of Nanjing reach is within the period of LGM. During LGM the deep incised-valley channel was narrow and the river flew swiftly, and expressed locally and deeply which incised features in Nanjing reach. The sediments of the deep incised valley consist of scree and gravel, gravel sand-coarde sand-medium sand from bottom to top.