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    江汉平原主要河流沉积物磁学特征及其与物源区表壳岩性的响应

    张玉芬 李长安 康春国 严玲琴 邵磊 张勇

    张玉芬, 李长安, 康春国, 严玲琴, 邵磊, 张勇, 2011. 江汉平原主要河流沉积物磁学特征及其与物源区表壳岩性的响应. 地球科学, 36(4): 771-778. doi: 10.3799/dqkx.2011.079
    引用本文: 张玉芬, 李长安, 康春国, 严玲琴, 邵磊, 张勇, 2011. 江汉平原主要河流沉积物磁学特征及其与物源区表壳岩性的响应. 地球科学, 36(4): 771-778. doi: 10.3799/dqkx.2011.079
    ZHANG Yu-fen, LI Chang-an, KANG Chun-guo, YAN Ling-qin, SHAO Lei, ZHANG Yong, 2011. Magnetic Characteristics of River Sediments in Jianghan Plain and Response to Rock Types of the Provenance. Earth Science, 36(4): 771-778. doi: 10.3799/dqkx.2011.079
    Citation: ZHANG Yu-fen, LI Chang-an, KANG Chun-guo, YAN Ling-qin, SHAO Lei, ZHANG Yong, 2011. Magnetic Characteristics of River Sediments in Jianghan Plain and Response to Rock Types of the Provenance. Earth Science, 36(4): 771-778. doi: 10.3799/dqkx.2011.079

    江汉平原主要河流沉积物磁学特征及其与物源区表壳岩性的响应

    doi: 10.3799/dqkx.2011.079
    基金项目: 

    国家自然科学基金 40971008

    国家自然科学基金 40672206

    国家自然科学基金 40771213

    国家重点基础研究发展“973”计划 2004CB720204

    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 SKLLQG09

    详细信息
      作者简介:

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

    • 中图分类号: P631.2

    Magnetic Characteristics of River Sediments in Jianghan Plain and Response to Rock Types of the Provenance

    • 摘要: 为了建立江汉平原沉积物示踪的磁学模型,对汇入江汉平原的主要河流现代沉积物磁学特征进行了研究,结果表明:(1)在江汉平原范围内,无论长江、汉江,还是周边的漳河、沮水、玛瑙河和清江,它们的现代沉积物的磁学参数特征均显示出明显的差异,而且和源区表壳岩性也显示出极好的相关性;(2)长江和汉江现代沉积物中铁磁性矿物均以亚铁磁性矿物为主,它们主导了样品的磁性特征,但长江沉积物比汉江沉积物亚铁磁性矿物含量高;(3)长江和汉江沉积物的亚铁磁性矿物晶粒都以假单畴-多畴为主,并且长江沉积物磁性颗粒总体上要比汉江的粗;(4)在汇入江汉平原的主要支流中,汉江的亚铁磁性矿物含量远远高于其他支流,且磁性矿物的晶粒也比其他支流的粗;(5)除汉江以外的支流中,玛瑙河沉积物中磁性矿物的晶粒比较细且不完全反铁磁性矿物含量较高,漳河中的超顺磁物质含量较高,而清江中不完全反铁磁性矿物含量较高且磁性矿物的晶粒相对较粗.上述结果表明,在江汉平原利用沉积物的磁学特征可达到沉积物物源示踪的目的.

       

    • 图  1  江汉平原及采样位置

      Fig.  1.  Sampling location in Jianghan plain

      图  2  江汉平原主要河流磁性参数

      Fig.  2.  Magnetic properties of main river sediments in Jianghan plain

      图  3  江汉平原主要河流χARM对比

      Fig.  3.  χARM value of main rivers sediments in Jianghan plain

      图  4  磁性参数χARM/χχARM/SIRM的散点图

      Fig.  4.  Plot of χARM/χ versus χARM/SIRM

      图  5  长江流域岩性分布(据中国科学院长春地理研究所,1998)

      Fig.  5.  Distributions of rock in the Yangtze River drainage basin

      表  1  江汉平原主要河流沉积物样品磁性参数

      Table  1.   Magnetic properties of main river sediments in Jianghan plain

      采样位置 河流 χ χfd% SIRM HIRM SIRM/χ F300 ARM χARM χARM/χ χARM/SIRM ARM/χ HIRM/SIRM
      周边支流 漳河 8.8 4.9 1 038.7 184.5 11.8 64.3 8.7 27.5 3.1 26.1 0.975 17.9
      沮水 6.9 3.8 1 042.3 194.9 15.0 62.5 9.1 28.5 4.1 27.7 1.314 18.7
      玛瑙河 7.1 3.7 1 028.7 205.7 15.8 59.1 11.7 36.7 5.4 35.1 1.706 20.4
      清江 9.4 2.6 1 428.7 207.2 15.0 71.3 6.3 19.7 2.0 13.5 0.782 14.4
      支流均值 8.1 3.8 1 134.6 198.1 14.4 64.3 9.0 28.1 3.7 25.6 1.112 17.5
      汉江 汉江牛首 79.1 1.2 4 043.0 111.6 5.2 94.9 13.6 55.1 0.6 9.3 0.174 2.8
      汉江宜城 117.1 1.3 6 034.8 235.3 5.9 95.6 17.5 114.5 1.2 14.6 0.378 2.9
      汉江钟祥 104.0 2.1 7 959.4 112.4 7.9 94.7 36.7 42.8 0.6 10.6 0.175 2.2
      汉江均值 100.1 1.5 6 012.4 153.1 6.3 95.1 22.6 70.8 0.8 11.5 0.226 2.5
      长江 长江宜昌 168.1 8.0 34 913.6 1 029.6 20.8 94.1 118.6 372.6 2.2 10.7 0.705 2.9
      长江红港 109.3 7.0 15 961.5 815.4 14.6 89.8 166.4 522.7 4.7 32.7 1.523 5.1
      长江云池 111.6 2.5 24 319.5 951.5 19.3 89.7 129.7 407.2 3.4 18.2 1.093 3.9
      长江均值 129.7 5.8 25 064.9 932.2 18.2 91.2 138.2 434.2 3.4 20.5 1.070 3.7
      注:χlf=χ,磁化率;χARM.非磁滞剩磁磁化率,它们的单位为10-8 m3·kg-1χfd%.磁化率频率系数;SIRM.饱和等温剩磁;HIRM.“硬”剩磁;ARM.非磁滞剩磁,它们的单位为10-6 Am2·kg-1F300.为样品在300 mT的磁场中所获得的剩磁占饱和等温剩磁的百分值(%);χARM/SIRM的单位为10-5 m·A-1ARM/χ单位为kA·m-1SIRM/χ单位为kA·m-1.
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