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成都平原风尘堆积的化学风化特征及其古气候意义

谭元隆 乔彦松 赵志中 王燕

谭元隆, 乔彦松, 赵志中, 等, 2013. 成都平原风尘堆积的化学风化特征及其古气候意义. 地质力学学报, 19 (1): 26-34.
引用本文: 谭元隆, 乔彦松, 赵志中, 等, 2013. 成都平原风尘堆积的化学风化特征及其古气候意义. 地质力学学报, 19 (1): 26-34.
TAN Yuan-long, QIAO Yan-song, ZHAO Zhi-zhong, et al., 2013. CHEMICAL WEATHERING CHARACTERISTICS AND PALEOCLIMATIC SIGNIFICANCE OF THE EOLIAN DEPOSITS IN CHENGDU PLAIN. Journal of Geomechanics, 19 (1): 26-34.
Citation: TAN Yuan-long, QIAO Yan-song, ZHAO Zhi-zhong, et al., 2013. CHEMICAL WEATHERING CHARACTERISTICS AND PALEOCLIMATIC SIGNIFICANCE OF THE EOLIAN DEPOSITS IN CHENGDU PLAIN. Journal of Geomechanics, 19 (1): 26-34.

成都平原风尘堆积的化学风化特征及其古气候意义

基金项目: 

中国地质调查局地质矿产调查评价专项 1212011087118

国土资源部公益性行业科研专项 201211077

详细信息
    作者简介:

    谭元隆(1988-), 男, 硕士研究生, 第四纪地质学专业。E-mail:yuanlongtan@yeah.com

    通讯作者:

    乔彦松(1966-), 男, 博士, 研究员, 主要从事第四纪地质研究。E-mail:yansongqiao66@gmail.com

  • 中图分类号: P532;P534.63

CHEMICAL WEATHERING CHARACTERISTICS AND PALEOCLIMATIC SIGNIFICANCE OF THE EOLIAN DEPOSITS IN CHENGDU PLAIN

  • 摘要: 对成都平原胜利红土剖面进行了系统的常量元素分析,并与川西典型黄土、古土壤样品的地球化学特征进行对比,研究本区风尘堆积所经历的化学风化作用过程,并对该序列化学风化特征的古气候意义进行探讨。研究结果表明,成都红土的常量元素组成与川西典型黄土、古土壤样品相似,与上地壳的平均化学成分也基本一致,说明成都红土与川西黄土一样,在堆积以前也经历了多次充分混合作用。在成都红土的形成过程中,Ca、Na元素大量淋失,含量很低,K、Mg也出现了不同程度的淋失,说明成都红土经历了斜长石和钾长石的化学风化过程。进一步的研究表明,成都黏土已达到中等风化的末期阶段,而网纹红土已进入强烈风化作用阶段。从整个序列的化学风化参数来看,距今1.13 Ma以来化学风化强度不断减弱,表明四川盆地及周围地区更新世中期以来有逐渐变干的趋势,与全球气候变化具有一致性。

     

  • 图  1  成都胜利红土剖面序列的主要化学成分

    Figure  1.  Main chemical compositions in the Shengli red earth profile in Chengdu

    图  2  成都胜利红土剖面中成都黏土、网纹红土主要元素含量比较

    Figure  2.  Comparison between the main element contents in Chengdu clay and in reticulate red soil in the Shengli red earth profile

    图  3  成都胜利红土剖面中成都黏土、网纹红土主要元素相对Al的比值变化特征

    Figure  3.  Ratio of main element contents in Chengdu clay and in reticulate red soil in the Shengli red earth profile to Al

    图  4  成都胜利红土剖面中成都黏土、网纹红土主要元素平均含量的UCC标准化值变化特征

    Figure  4.  Ratio of main element contents in Chengdu clay and in reticulate red soil in the Shengli red earth profile to UCC

    图  5  成都胜利红土剖面中成都黏土、网纹红土和甘孜黄土、古土壤的化学风化趋势

    Figure  5.  Chemical weathering tendency of Chengdu clay and reticulate red soil in the Shengli red earth profile, Ganzi loess and ancient soil

    图  6  成都胜利红土剖面化学风化参数随深度变化特征

    Figure  6.  Changes of chemical weathering parameters from the Shengli red earth profile in Chengdu with the depth

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  • 收稿日期:  2012-10-15
  • 刊出日期:  2013-06-01

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