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    青海湖地区晚第四纪黄土的物质来源

    曾方明

    曾方明, 2016. 青海湖地区晚第四纪黄土的物质来源. 地球科学, 41(1): 131-138. doi: 10.3799/dqkx.2016.010
    引用本文: 曾方明, 2016. 青海湖地区晚第四纪黄土的物质来源. 地球科学, 41(1): 131-138. doi: 10.3799/dqkx.2016.010
    Zeng Fangming, 2016. Provenance of the Late Quaternary Loess Deposit in the Qinghai Lake Region. Earth Science, 41(1): 131-138. doi: 10.3799/dqkx.2016.010
    Citation: Zeng Fangming, 2016. Provenance of the Late Quaternary Loess Deposit in the Qinghai Lake Region. Earth Science, 41(1): 131-138. doi: 10.3799/dqkx.2016.010

    青海湖地区晚第四纪黄土的物质来源

    doi: 10.3799/dqkx.2016.010
    基金项目: 

    中国博士后科学基金项目 2014T70951

    中国博士后科学基金项目 2013M532098

    青海省自然科学基金项目 2013-Z-926Q

    中国科学院青海盐湖研究所青年引导基金项目 Y360361050

    国家自然科学基金项目 41201014

    详细信息
      作者简介:

      曾方明(1982-),男,博士,副研究员,主要研究方向为黄土地球化学.E-mail:fmzeng@163.com

    • 中图分类号: P534.63;P532

    Provenance of the Late Quaternary Loess Deposit in the Qinghai Lake Region

    • 摘要: 青海湖地区的晚第四纪黄土记录了湖区晚第四纪以来的环境和气候变化.迄今为止,对于青海湖地区晚第四纪黄土物质来源的研究较薄弱.以青海湖东岸的种羊场晚第四纪风成沉积剖面为主要研究对象,在青海湖区及其周边采集了黄土、风成砂、湖相沉积、河流沉积等样品,结合黄土高原西部临洮黄土样品,对它们的元素组成(<75 μm的硅酸盐组分)进行了对比研究.初步结果表明:(1) K2O/Al2O3(摩尔比)和Zr/Ti、Zr/Nb比值显示青海湖地区的风成沉积显著区别于本区的河流沉积和湖相沉积;(2) 青海湖地区的晚第四纪黄土与黄土高原西部临洮黄土的K2O/Al2O3和Zr/Ti、Zr/Nb比值相一致;(3) 青海湖地区的晚第四纪黄土可能来自柴达木盆地.

       

    • 图  1  研究区地理位置(a)和样品分布概图(b)

      白色箭头为1979—2008年春季200 hPa西风环流的平均风场,数据来源于NCEP-2再分析数据;底图来自Google Earth

      Fig.  1.  Location of the study area between the Qaidam basin and Chinese Loess Plateau (a) and spatial sketch of samples (b)

      图  2  各类样品的K2O/Al2O3-Zr/Ti和K2O/Al2O3-Zr/Nb比值

      K2O/Al2O3为摩尔比值

      Fig.  2.  Plots of element ratios K2O/Al2O3 vs. Zr/Ti, and K2O/Al2O3 vs. Zr/Nb of different samples

      表  1  青海湖及周边地区黄土、风成砂、河流和湖相沉积以及临洮黄土元素组成

      Table  1.   Element compositions of loess, eolian sand, fluvial and lacustrine deposits in the Qinghai Lake and adjacent region and loess deposits at Lintao county

      样号 岩性 Ba
      (10-6)
      Mn
      (10-6)
      Nb
      (10-6)
      P
      (10-6)
      Sr
      (10-6)
      Ti
      (10-6)
      Zr
      (10-6)
      SiO2
      (%)
      Al2O3
      (%)
      Fe2O3
      (%)
      CaO
      (%)
      K2O
      (%)
      MgO
      (%)
      Na2O
      (%)
      K2O/ Al2O3* Zr/Ti Zr/Nb
      ZYC8 土壤 453.111 197.006 13.934 324.064 147.355 3 818.946 404.664 70.536 11.738 2.283 0.872 2.627 0.970 1.722 0.242 0.106 29.04
      ZYC18 古土壤 466.961 257.434 15.712 370.591 135.879 4 110.997 303.240 68.882 12.480 3.610 0.829 2.652 1.401 1.771 0.230 0.074 19.30
      ZYC25 古土壤 493.507 192.925 16.611 330.316 128.783 4 250.000 257.579 69.797 13.304 3.010 0.711 2.967 1.122 1.575 0.241 0.061 15.51
      ZYC30 古土壤 515.893 203.684 16.624 267.994 125.633 4 255.133 238.729 70.429 13.126 3.179 0.753 2.910 1.171 1.711 0.240 0.056 14.36
      ZYC43 黄土 497.850 242.575 14.881 351.007 132.331 3 897.996 278.210 66.928 12.598 3.558 0.802 2.728 1.432 1.727 0.234 0.071 18.70
      ZYC46 黄土 479.095 188.542 14.328 229.557 140.073 3 972.136 300.738 70.544 12.018 2.485 0.835 2.733 1.012 1.790 0.246 0.076 20.99
      ZYC57 风成砂 461.648 207.918 14.502 159.270 166.929 3 400.130 425.733 69.447 10.344 2.171 1.037 2.399 1.023 1.950 0.251 0.125 29.36
      ZYC60 风成砂 463.094 205.617 14.177 133.082 167.888 3 555.022 426.951 70.041 10.368 2.100 1.046 2.433 0.961 2.000 0.254 0.120 30.12
      LT15 古土壤 483.296 198.310 15.366 174.439 145.532 3 834.865 289.525 70.847 12.286 2.706 0.827 2.700 1.110 1.776 0.238 0.075 18.84
      LT36 黄土 498.240 170.544 14.261 120.600 153.293 3 755.878 274.598 70.628 11.642 2.215 0.853 2.676 0.955 1.888 0.249 0.073 19.26
      CK 黄土 494.261 195.861 14.517 132.495 158.748 3 657.730 390.924 71.541 10.913 2.095 0.937 2.476 0.964 1.870 0.246 0.107 26.93
      WL 黄土 532.197 192.101 16.438 170.229 121.740 4 321.781 221.823 70.493 14.105 2.808 0.676 3.243 1.199 1.548 0.249 0.051 13.49
      GJS 黄土 481.277 274.787 15.927 270.695 139.605 4 193.302 354.186 69.553 12.343 3.592 0.906 2.580 1.415 1.855 0.226 0.084 22.24
      HD-1 风成砂 496.285 154.176 9.572 105.055 178.347 2 660.502 222.920 69.665 9.432 1.404 0.854 2.180 0.814 2.171 0.250 0.084 23.29
      HD-2 风成砂 447.814 162.474 12.605 107.225 171.671 2 930.469 403.625 69.770 8.829 1.534 0.826 2.039 0.712 2.189 0.250 0.138 32.02
      SNH 风成砂 481.589 212.506 13.072 158.098 166.588 3 153.683 295.566 68.643 11.196 2.514 0.976 2.526 1.229 1.893 0.244 0.094 22.61
      BHH-1 河流沉积 466.551 192.329 17.611 133.383 158.391 4 333.907 719.999 70.761 10.931 2.192 0.781 2.350 0.938 1.949 0.233 0.166 40.88
      BHH-2 河流沉积 494.661 183.116 15.115 177.608 145.457 3 842.529 349.564 70.276 11.907 2.513 0.657 2.548 1.107 1.828 0.232 0.091 23.13
      ELJ-1 湖相沉积 470.430 246.337 14.397 121.810 152.082 3 756.060 484.210 72.615 11.835 2.389 1.060 2.580 1.087 2.087 0.236 0.129 33.63
      ELJ-2 湖相沉积 511.306 215.386 17.378 118.480 142.143 4 228.275 395.961 71.432 12.899 2.484 0.885 2.842 1.109 1.826 0.238 0.094 22.79
      注:*K2O/Al2O3比值为摩尔比(K2O的分子量为94.20,Al2O3的分子量为101.96).
      下载: 导出CSV
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