- 责任者：Li Bing (Shanghai Institute of Geological Survey ; Shanghai200072 ; China) ; Wei Zixin
- 刊名：Quaternary Sciences
- 出版年：2011
- 卷期：31(2)
- 关键词：第四纪 ; Quaternary ; 古环境 ; paleoenvironment ; 长江三角洲 ; Yangtze River Delta
- 页码：p.316-328
- 图表：7 illus., 2 tables, 74 refs.
- 分类号：1400
- issnNo：ISSN1001-7410
- isbnNo：CN11-2708/P
The SG7 borehole (30°57’32″N,121°52’03″E) is located at Lin-Gang-Xin-Cheng (means near harbor new town) in Nanhui district in Shanghai city in southeastern part of the Yangtze River Delta (YRD). The following results are obtained: 1) there is a large-scale fining sedimentary sequence upwards in Quaternary strata in SG7, composed of six fining sub-sequences upwards, indicating six different evolution phases in this area during Quaternary; 2) the sediment of the Quaternary strata in the YRD was changed dramatically at 1.2 Ma B.P; 3) since 1.2 Ma B.P., the magnetic susceptibility of the strata showed the periodic variation accompany with the stratigraphic and geochronological sequences; 4) comparing with the studies on spore and pollen analysis,the magnetic susceptibility of the strata after 1.2 Ma B.P. could obviously indicate the palaeo-climate changes in the YRDB; and 5) according to the changes of magnetic susceptibility, two abrupt cooling and drying climate change events could be recognized in the YRDB at 1.2 Ma B.P. and 3.8 ka B.P.