地学前缘 ›› 2009, Vol. 16 ›› Issue (6): 195-206.

• 论文 • 上一篇    下一篇

黄土高原黄土物源区的同位素证据

杨杰东,李高军,戴澐,饶文波,季峻峰   

  1. 1南京大学 现代分析中心, 江苏 南京 210093
    2南京大学 表生地球化学研究所, 江苏 南京 210093
    3南京大学 地球科学与工程学院, 江苏 南京 210093
    4上海市安全生产科学研究所, 上海 200233
    5河海大学 科学研究院同位素水文研究所, 江苏 南京 210098
  • 收稿日期:2009-04-17 修回日期:2009-06-18 出版日期:2009-12-16 发布日期:2009-12-10
  • 作者简介:杨杰东(1944—),男,教授,博士生导师,主要从事同位素地球化学和地质年代学的科研工作。Email: jdyang@nju.edu.cn
  • 基金资助:

    国家自然科学基金项目(40873001,40473009)

 Isotopic evidences for provenances of loess of the Chinese Loess Plateau.

 YANG Jie-Dong, LI Gao-Jun, DAI Yun, RAO Wen-Bei, JI Jun-Feng   

  1. 1Center of Modern Analysis, Nanjing University,  Nanjing 210093, China
    2Institute of Surficial Geochemistry, Nanjing University,  Nanjing 210093, China
    3School of Earth Sciences and Engineering, Nanjing University,  Nanjing 210093, China
    4Shanghai Institute of Work Safety Science,Shanghai 200233, China
    5Institute of Isotope Hydrology, Research Academy of Hohai University, Nanjing 210098, China
  • Received:2009-04-17 Revised:2009-06-18 Online:2009-12-16 Published:2009-12-10

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摘要：

系统采集了黄土高原马兰黄土、河西走廊和青藏高原东北部黄土、河床沙和湖泥样品。用酸淋洗去除方解石后,黄土高原马兰黄土εNd(0)值从-92到-113, 87Sr/86Sr比值从0717 84到0719 44,都落在同位素B区内,与青藏高原东北部、巴丹吉林沙漠和腾格里沙漠的值一致。黄土高原马兰黄土白云石的δ13C值从12‰到15‰,与青藏高原东北部和河西走廊黄土,巴丹吉林沙漠的白云石的值类似。这些表明青藏高原东北部、巴丹吉林沙漠和腾格里沙漠可能是黄土高原黄土的源区,从而排除了其他沙漠(古尔班通古特沙漠、塔克拉玛干沙漠、毛乌素沙漠、库布齐沙漠、浑善达克沙地、科尔沁沙地和呼伦贝尔沙地)作为黄土物源区的可能性。同位素研究结果和野外调查进一步揭示,黄土高原黄土、巴丹吉林沙漠和腾格里沙漠物质可能最终都是来源于青藏高原东北部。

关键词: 同位素;黄土;沙漠;中国黄土高原;青藏高原

Abstract:

 We have systematically collected the samples of the Malan loess in the Chinese Loess Plateau(CLP), the sand of ten deserts, the loess of the Hexi corridor, and the loess and sediments of riverbed and lake bottom on the northeast part of the QinghaiTibet Plateau. After removing calcites, the determined Nd and Sr isotopes of the Chinese Loess Plateau show that εNd(0) from -92 to -113 and 87Sr/86Sr from 071784 to 071944. They fall within the B region of NdSr isotope plot of provenances and are identical to those of the Badain Jaran Desert, the Tengger Desert and the northeast part of the QinghaiTibet Plateau. The determined C isotopes of dolomites of the Chinese Loess Plateau show that δ13C from 12‰ to 15‰. They are identical to those of the Qaidam Desert, the Hexi corridor and the northeastern part of the Tibetan Plateau. These imply that the northeastern part of the Tibetan Plateau, the Badain Jaran Desert and the Tengger Desert may be the source areas of loess materials of the Loess Plateau, and that the possibility of the other deserts and sandy lands being the provenances of the loess is excluded, among them including the Gurbantunggut Desert, the Hunlun Buir sandy land, the Onqin Daga sandy land, the Horqin sandy land, the Hobqi Desert, the Mu Us Desert and the Taklimakan Desert. The field surveys further reveal the possibility that the materials of the Chinese Loess Plateau, the Badain Jaran Desert and the Tengger Desert are derived ultimately from the northeast part of the QinghaiTibet Plateau.

Key words:  isotope; loess; desert; Chinese Loess Plateau; QinghaiTibet Plateau