地理学报 ›› 2006, Vol. 61 ›› Issue (9): 965-975.doi: 10.11821/xb200609008

• 干旱区环境研究 • 上一篇    下一篇

萨拉乌苏河流域萨拉乌苏组沙丘砂沉积特征

欧先交1, 李保生1,2, 靳鹤龄3, 吴正1, 温小浩1, 董光荣3, 曾兰华1, 欧阳椿陶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;
    3. 中国科学院寒区旱区环境与工程研究所,兰州 730000
  • 收稿日期:2006-01-06 修回日期:2006-06-20 出版日期:2006-09-25 发布日期:2010-09-01
  • 通讯作者: 李保生 (1951-), 男, 教授, 博士生导师, 多年来从事晚更新世环境演变研究。E-mail: libsh@scnu.edu.cn E-mail:libsh@scnu.edu.cn
  • 作者简介:欧先交 (1981-), 男, 博士研究生, 研究方向为环境演变。E-mail: ouxianjiao@163.com
  • 基金资助:

    国家重点基础研究发展计划 (2004CB720200); 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)

Sedimentary Characteristics of Paleo-eolian Dune Sands in Salawusu Formation of the Salawusu River Valley

OU Xianjiao1, LI Baosheng1,2, JIN Heling3, WU Zheng1, WEN Xiaohao1, DONG Guangrong3, ZENG Lanhua1, OUYANG Chuntao1, 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;
    3. Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China
  • Received:2006-01-06 Revised:2006-06-20 Online:2006-09-25 Published:2010-09-01
  • Supported by:

    National Basic Research Program of China, No.2004CB720200; National Natural Science Foundation of China, No.49971009; Knowledge Innovation Project of the Chinese Academy of Sciences, No.KZCX2-SW-118

摘要:

萨拉乌苏河流域米浪沟湾剖面萨拉乌苏组含7层古流动沙丘砂、4层古固定—半固定沙丘砂。对这些沙丘砂的沉积构造观察以及粒度、扫描电镜和常量化学元素分析结果表明:(1) 这些沙丘砂具有与现代沙丘砂相似的风成沉积构造特征;(2) 粒度及其参数——Mz、?滓、Sk和Kg,以及主要化学组分SiO2、Al2O3和TOFE也与现代沙丘砂相近;(3) Mz-σ、SiOO2-AlO2OO3+TOFE散点图和概率累积曲线显示这些沙丘砂与萨拉乌苏组中的河湖相、古土壤差别明显,而与现代沙丘砂一致;(4) 石英砂颗粒具有良好的磨圆以及碟形坑、新月形坑、麻坑、上翻解理薄片、硅质沉淀和硅质裂纹等表面结构特征,反映其曾受持久的风力搬运作用。沉积构造、粒度、石英砂颗粒表面结构和化学元素等多个方面具备了与现代沙丘砂类似的风成特征,证明这些沙丘砂的成因是风成的。

关键词: 萨拉乌苏河, 萨拉乌苏组, 沙丘砂, 风成沉积特征

Abstract:

The Salawusu Formation of Milanggouwan section in Salawusu River Valley includes 7 layers of paleo-mobile dune sands, and 4 layers of paleo-fixed and semi-fixed dune sands. We have observed the structure of these dune sands and analyzed the grain-size, surface textural features and several main chemical elements of them, the results showed that: (1) these dune sands have some eolian structure characteristics which are similar to the recent dune sands; (2) they are also similar to the recent dune sands in grain-size components, and parameters of Mz, σ, Sk and Kg, as well as in several main chemical components; (3) the scatter plots of Mz-σ, SiO2-Al2O3+TOFE and the probability curves of grain-size showed that these paleo dune sands are different from paleosols and fluvio-lacustrine facies but are consistency with recent dune sands; and (4) the quartz sands have well roundness and some surface textural features such as dish-shape pits, crescent-shape pits, pockmarked pits, upturned cleavage plates, siliceous precipitates and siliceous crevasses, indicating that they had been carried for a long time by the wind. As the 11 layers of paleo dune sands possess the eolian characteristics in structure, grain-size, surface textural features and chemical elements, the origin of their formation should be eolian.

Key words: Salawusu River, Salawusu Formation, paleo-eolian dune, eolian sedimentary characteristic