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    江汉平原东北缘麻城剖面磁化率特征及气候环境意义

    张玉芬 李长安 孙习林 毛欣 高孟秋 熊德强 王金鑫

    张玉芬, 李长安, 孙习林, 毛欣, 高孟秋, 熊德强, 王金鑫, 2016. 江汉平原东北缘麻城剖面磁化率特征及气候环境意义. 地球科学, 41(7): 1225-1230. doi: 10.3799/dqkx.2016.100
    引用本文: 张玉芬, 李长安, 孙习林, 毛欣, 高孟秋, 熊德强, 王金鑫, 2016. 江汉平原东北缘麻城剖面磁化率特征及气候环境意义. 地球科学, 41(7): 1225-1230. doi: 10.3799/dqkx.2016.100
    Zhang Yufen, Li Chang'an, Sun Xilin, Mao Xin, Gao Mengqiu, Xiong Deqiang, Wang Jinxin, 2016. Sediment Magnetism Characteristics and Its Climatic Environment Significance of Northeast Margin of Jianghan Plain. Earth Science, 41(7): 1225-1230. doi: 10.3799/dqkx.2016.100
    Citation: Zhang Yufen, Li Chang'an, Sun Xilin, Mao Xin, Gao Mengqiu, Xiong Deqiang, Wang Jinxin, 2016. Sediment Magnetism Characteristics and Its Climatic Environment Significance of Northeast Margin of Jianghan Plain. Earth Science, 41(7): 1225-1230. doi: 10.3799/dqkx.2016.100

    江汉平原东北缘麻城剖面磁化率特征及气候环境意义

    doi: 10.3799/dqkx.2016.100
    基金项目: 

    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开放基金项目 SKLLQG0908

    国家自然科学基金项目 41440002

    中国地质调查局项目 1212011121142

    详细信息
      作者简介:

      张玉芬(1957-),女,教授,博士,主要从事环境地质和环境地球物理等方面的教学与研究.E-mail: zhyfcug@163.com

    • 中图分类号: P631

    Sediment Magnetism Characteristics and Its Climatic Environment Significance of Northeast Margin of Jianghan Plain

    • 摘要: 为了探讨和揭示江汉平原晚更新世以来沉积物磁学特征和该区的气候环境演变规律,对新近发现的位于江汉平原东北缘的麻城剖面进行了磁化率样品的采集和测试与对应年代学分析,结果表明:(1) 麻城剖面沉积物质量磁化率值偏低,平均值为10.85×10-8 m3·kg-1,全剖面变化不大,为5.76×10-8~23.39×10-8 m3·kg-1,但频率磁化率波动较大,分布于5.35%~50.35%,平均值为24.71%,显示具有较高的超顺磁性颗粒(super paramagnetism,SP)含量;(2) 根据磁化率和频率磁化率曲线的旋回波动特点,结合年代学测试结果,将该区的古气候环境划分为7个不同的演化阶段.初步认为该区晚更新世以来沉积环境经历了由湖沼相沉积-湖相沉积-泛滥平原中的沼泽沉积环境的变化.气候经历了温湿-干冷-暖湿-干凉-干冷-温湿-干(旱)偏冷的阶段性变化过程,与晚更新世晚期以来全球气候变化特点具有较好的一致性.

       

    • 图  1  研究剖面地理位置(a)和采样剖面(b)

      Fig.  1.  Location of studied profile (a) and sampling profile (b)

      图  2  麻城剖面质量磁化率、频率磁化率、平均粒径曲线及岩性柱状图

      Fig.  2.  Depth-varying of mass susceptibility, frequency susceptibility, average particle size, and lithological column in Macheng profile

      表  1  麻城剖面不同阶段磁化率和频率磁化率统计

      Table  1.   Statistics on magnetic susceptibility and frequency susceptibility in different phases in Macheng profile

      阶段深度(cm)年龄(a BP)质量磁化率(10-8 m3·kg-1)频率磁化率(%)气候环境
      最小值最大值平均值标准差最小值最大值平均值标准差
      30.0~95.08 604~10 0435.768.147.150.669.9341.4930.119.99气候干冷,降水减少
      100.0~157.510 153~ 11 4268.7111.8810.051.077.5031.8218.778.70气候有所转暖,降水有所增多
      160.0~210.011 481~ 12 5888.610.119.270.437.9446.8329.2314.01气候寒冷,降水减少
      212.5~295.012 643~ 14 4698.749.779.890.7510.0046.4723.979.12气候温暖,降水减少
      297.5~350.014 525~ 15 68714.1723.3918.332.336.7539.9718.738.23气候温暖,降水增多,环境不稳定,频发洪水
      352.5~410.015 742~ 17 0157.4612.009.381.1910.0250.3525.5011.92气候偏冷,降水减少,但环境不稳定,洪水频发
      412.5~450.017 070~ 17 90010.0513.5711.601.0735.3533.0317.098.49气候比较温湿,降水较多
      下载: 导出CSV
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    • 收稿日期:  2015-11-10
    • 刊出日期:  2016-07-15

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