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中国沙漠 ›› 2004, Vol. 24 ›› Issue (2): 153-155.

• 研究论文 • 上一篇    下一篇

关中盆地东部全新世剖面粒度组成与气候变化研究

贾耀锋, 庞奖励   

  1. 陕西师范大学 旅游与环境学院 陕西 西安 710062
  • 收稿日期:2002-07-04 修回日期:2002-09-10 出版日期:2004-04-20 发布日期:2004-04-20
  • 作者简介:贾耀锋(1968-),男(汉族),宁夏西吉人,博士研究生,主要从事环境变迁方面的研究。E-mail:jyf7779@sohu.com
  • 基金资助:
    国家自然科学基金项目(400071006); 教育部文社科重点研究基地重大招标项目(01JAZJD770014)共同资助

Composition Characteristics of Grain Size and Suggesting Palaeoclimate at Liwan Section in Eastern Guanzhong Basin

JIA Yao-feng, PANG Jiang-li   

  1. College of Tourism and Environmental Science, Shaanxi Normal University, Xi'an 710062, China
  • Received:2002-07-04 Revised:2002-09-10 Online:2004-04-20 Published:2004-04-20

摘要: 根据李湾全新世剖面粒度组成的分析结果, 探讨了关中盆地东部黄土粒度组成特征及其所指示的古气候意义: 2~6μm的细粒级组分反映了夏季风的强度或成壤作用的强度, 26~53μm的较粗颗粒组分反映了冬季风的强度, 大于53μm以上的粗颗粒组分反映了冬季风的异常变化特征, 小于2μm粘粒组分和6~26μm的较细粒级组分的含量变化可能反映了两种动力条件下搬运的大气粉尘本底; 粒度组成变化同时说明: 全新世气候的不稳定性在关中盆地东部地区亦有明显的反映, 6000~5000aBP的干旱事件在关中盆地具有普遍性。

关键词: 粒度组成, 气候变化, 关中盆地东部

Abstract: According to the results of grain size analyzing of Liwan section, we have studied the composition characteristics of loess-palaeosol grain size and its suggesting palaeoclimate in this district. The component of 2~6 m reflects the intensity of summer monsoon and pedogenesis, 26~53 m presents the intensity of winter monsoon, >53 m reflects abnormal change of winter monsoon, and the component change of <2 m and 6~26 m is complex, possibly represents the backdrop values under the two dynamics. Meanwhile, the change of grain size component also has showed the instability of climate during Holocene in this area, and the arid event during 6 000~5 000 a BP popularized in Guanzhong Basin.

Key words: composition of grain size, climate change, eastern Guanzhong Basin

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