Magnetic Properties of Jiuzhoutai Loess in Lanzhou and Its Significance of Palaeoclimate
详细信息
- 责任者：Liu Xianbin (Key Laboratory of Western China’s Environmental Systems ; Ministry of Education ; Research School of Arid Environment & Climate Change ; Lanzhou University ; Lanzhou 730000 ; China) ; Xia Dunsheng
- 刊名：Quaternary Sciences
- 出版年：2012
- 卷期：32(4)
- 关键词：黄土 ; loess ; 古气候 ; paleoclimate ; 环境磁学 ; environmental magnetism ; 甘肃 ; Gansu Province
- 页码：p.761-770
- 图表：4 illus., 67 refs.
- 分类号：1400
- issnNo：ISSN1001-7410
- isbnNo：CN11-2708/P
摘要
In this paper,the authors investigated the Jiuzhoutai loess section which is situated at the sixth-level terrace of north shore of the Yellow River in Lanzhou City and is the most representative loess sequences in the western Chinese Loess Plateau.Results show that the main magnetic minerals of the loess deposit are magnetite,maghaemite,haematite,and the main magnetic grain size of magnetic minerals are PSD.The trends of parameters of magnetic and grain-size properties indicate that the changes of winter and summer monsoon were not completely reverse.Relative to the summer monsoon,winter monsoon has a certain lag in the period of transition between penultimate glaciation and the Last Interglacial.The drives of summer and winter monsoon may be different.