地理学报 ›› 2007, Vol. 62 ›› Issue (5): 518-528.doi: 10.11821/xb200705008

• 黄河流域环境演变 • 上一篇    下一篇

萨拉乌苏河流域末次间冰期 古土壤化学风化与古气候

欧阳椿陶1, 李保生1,2, 欧先交1, 温小浩1, 曾兰华1, 杨艺1, 刘宇飞1   

  1. 1. 华南师范大学地理科学学院, 广州510631;
    2. 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室, 西安710061
  • 收稿日期:2006-05-28 修回日期:2007-02-20 出版日期:2007-05-25 发布日期:2010-08-04
  • 通讯作者: 李保生(1951-), 男, 教授, 多年来从事第四纪环境演变研究。E-mail: libsh@scnu.edu.cn E-mail:libsh@scnu.edu.cn
  • 作者简介:欧阳椿陶(1970-), 男, 研究生, 研究方向为环境演变。E-mail: oyct1122@163.com
  • 基金资助:

    国家重点基础研究发展计划(973 计划) (2004CB720206); 国家自然科学基金(49971009); 中国科学院知识创 新工程重要方向(KZCX2-SW-118)

Chemical Weather ing of the Milanggouwan Paleosols in the Salawusu River Valley and Their Paleoclimatic Implication during the Last Interglacial Period

OUYANG Chuntao1, LI Baosheng1,2, OU Xianjiao1, WEN Xiaohao1, ZENG Lanhua1, YANG Yi1, LIU Yufei1   

  1. 1. School of Geography, South China Normal University, Guangzhou 510631, China;
    2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, CAS, Xi'an 710061, China
  • Received:2006-05-28 Revised:2007-02-20 Online:2007-05-25 Published:2010-08-04
  • Supported by:

    National Basic Research Program of China, No. 2004CB720206; National Natural Science Foundation of China, No.49971009; Knowledge Innovation Program of CAS, No.KZCX2-SW-118

摘要:

内蒙萨拉乌苏河流域米浪沟湾剖面末次间冰期发育5 层古土壤。对这5 层古土壤的形 态特征、粒度、扫描电镜及化学风化等分析结果表明: (1) 这些古土壤具有与华北现代褐土相 似的形态特征; (2) 粘化率中部高和石英颗粒表面硅质溶蚀—沉淀现象表明古土壤层中发生过 风化成壤作用; (3) 用K2O/Na2O、Al2O3/Na2O、MnO/Al2O3、CIA 及A-CN-K 图解与华北现代 褐土作对比分析, 发现它们的化学风化特征极为相似; (4) 用气温及降水量与CIA 值的回归 关系方程, 得出5 层古土壤发育时期的水热状况确与华北现代的暖温带半湿润季风性气候大 致相同或更显暖湿。形态特征、粒度、石英颗粒表面特征和化学风化特征等多个方面具备了 与现代华北褐土类似的化学风化成壤特征, 证明这些古土壤是在与华北相似的暖温带半湿润 季风性气候条件下形成的。

关键词: 萨拉乌苏河, 古土壤, 化学风化, 末次间冰期, 古气候

Abstract:

There are five layers of paleosols in Milanggouwan section in Salawusu River valley of Inner Mongolia during the last interglacial period. We have observed the morphological features of these paleosols and analyzed their grain-size, surface textural features and chemical weathering. The results showed that: (1) These paleosols have some morphological features just like the recent cinnamon soils in North China. (2) They are similar to the recent cinnamon soils that have higher clay contents in the middle part than in the other parts of the soil and SiO2 solution and precipitation can be observed on the surface of the quartz grain, indicating that chemical weathering and pedogenic process have taken place. (3) On the basis of CaO/MgO, K2O/Na2O, Al2O3/Na2O, MnO/Al2O3, CIA and A-CN-K diagram, the comparison results show that the intensity of chemical weathering in paleosols is very similar to the recent cinnamon soils in North China. (4) Using the regression equation of CIA, the values of annual temperature and precipitation of those paleosols can be calculated respectively, and with those values, it is easy to ascertain that the climate conditions are similar to that of North China.

Key words: Salawusu River, the last interglacial period, paleosol, chemical weathering, paleoclimate