LOESS DEPOSITS ON THE TOP OF SECTIONS OF NIHEWAN BASIN AND ITS PALAEOGEOGRAPHIC SIGNIFICANCE
Yang Xiaoqiang Li Huamei Li Haitao
1 Department of Earth Sciences, Zhongshan University,Guangzhou 510275,Guangdong
2 Guangzhou Institute of Geochemistry, Chinese Academy of Science, Guangzhou 510640,Guangdong
Based on the study of the characteristics of magnetic susceptibility and grain-size of the loess on the top of some typical sections including Haojiatai(HJT), Xiaochangliang(XCHL) and Donggutuo(DGT) in the Nihewan basin, we try to demonstrate the palaeogeographic status of the basin from the Late Pleistocene. The results indicated that the loess can be divided into three layers: S1, L1, and S0, which have the perfect correlation with those in the Loess Plateau of China and the marine oxygen isotope stage MIS1~MIS5. It recorded the short-term variations of climatic and environmental evolution over the last 130 ka. of North China. Loess of these sections shows the diversity of evolution of the basin. The uplift of the eastern part of the basin due to faulting made the lake vanish and loess was deposited, however, the western part of the basin was still lake during this period.
［1］卫奇，谢飞. 泥河湾研究论文选编. 北京：文物出版社，1989
［2］黄万波，汤英俊. 泥河湾盆地晚新生代几个地层剖面的观察. 泥河湾研究论文选编，文物出版社，1989
［3］Teilhard de Chardin, P.et Piveteau, J. Les Mammiferes fossils de Nihowan(Chine). Annales de paeontologie, 1930,Tome XIX
［4］刘东生，张宗祜. 中国的黄土. 地质学报，1962，42: 1-14
［5］刘东生. 黄河中游黄土. 北京：科学出版社，1964
［6］夏正楷，张昀. 泥河湾层中叠层石的发现及其古环境意义. 中国科学(B)，1993,23(8): 874-879
［7］夏正楷，韩军青. 泥河湾盆地虎头梁湖相叠层石的生态环境分析. 第四纪研究，1998，(4):344-350
［8］王世杰，刘秀明. 陆相有孔虫形成环境的地球化学证据—以小渡口剖面为例. 中国科学（D），2001, 31(8):677-682
［9］李容全，乔建国. 泥河湾层内易溶盐沉积及其环境意义. 中国科学（D），2000, 30(2):148-158
［10］R X Zhu, K A Hoffman. Earliest presence of humans in northeast Asian. Nature, 2001(413):413-417
［11］Li Huamei, Wang Junda. Magnetostratigraphic study of several typical geologic sections in North China. Quaternary Geology and Environment of China. 1982
［12］Jef Vandenberghe, An Zhisheng. New absolute time scale for the Quaternary climate in the Chinese loess region by grain-sized analysis. Geoloy, 1997(1):35-38
［13］George Kukla, Friedrich Heller. Pleistocene climates in China dated by magnetic susceptibility. Geology, 1988(16): 811-814
［14］Maher B A, Thompson R. Spatial and temporal reconstructions of changes in the palaeomonsoon: A new mineral magnetic approach. Earth Planetary Science Letters, 1994(125):461-471
［15］Heller F, Liu X M. Magnetic susceptibility of loess in China. Earth Planetary Science Letters, 1991(103):301-310
［16］鸟居雅之，福间浩司. 黄土-古土壤磁化率述评. 海洋地质与第四纪地质，1999, 19(3):83-96
［17］鹿化煜，安芷生. 洛川黄土粒度组成的古气候意义. 科学通报，1997, 42(1):66-69
［18］鹿化煜，安芷生. 黄土高原黄土粒度组成的古气候意义. 中国科学(D)，1998,28(3): 278-283
［19］丁仲礼，孙继敏. 黄土高原过去130ka 以来古气候事件年表. 科学通报，1998，43(6):567-574;
［20］C Kissel, C Laj. Rapid climatic variations during maring isotopic stage3: magnetic analysis of sediments from Nordic Seas and North Atlantic. Earth and Planetary Science Letters, 1999(171):489-502;
［21］孙继敏，丁仲礼. 近13万年来黄土高原干湿气候的时空变迁. 第四纪研究，1997(2):168-175;
