地理科学 ›› 1987, Vol. 7 ›› Issue (4): 364-368.doi: 10.13249/j.cnki.sgs.1987.04.364

• 论文 • 上一篇    下一篇

松辽平原土壤中稀土、铀和钍等微量元素的环境背景值

王玉琦, 孙景信, 屠树德, 张元纪   

  1. 中国科学院高能物理研究所, 北京
  • 出版日期:1987-07-20 发布日期:1987-07-20

THE ENVIRONMENTAL BACKGROUND VALUES OF REE, U AND Th IN SOILS OF THE SONGLIAO PLAIN

Wang Yuqi, Sun Jingxin, Tu Shude, Zhang Yuanji   

  1. Institute of High Energy Physics, Academia Sinica, Beijing
  • Online:1987-07-20 Published:1987-07-20

摘要: 松辽平原位于我国东北地区的中南部,主要由辽河、松花江、嫩江及其支流冲积而成,是东北地区的重要工农业生产基地,在我国国民经济中占有重要地位。稀土及铀、钍等元素作为地球化学指示剂得到越来越广泛的重视。目前,国内、外在这方面的工作已得到迅速发展。研究它们的分布及迁移规律对探讨岩浆起源、成矿物质来源和地球化学演化等都有重要作用。本文首次用INAA方法测定了松辽平原96个典型剖面表土中的八个稀土(La、Ce、Nd、Sm、Eu、Tb、Yb和Lu)及铀、钍元素的含量;对松辽平原土壤中上述元素的分布类型进行了检验,并给出了它们的背景值。同时,对分布于该地区的主要类型土壤(黑土、黑钙土、草甸土、棕壤、褐土、栗钙土、暗棕壤和白浆土)中的稀土元素和铀、钍的含量水平及其分布特征作了初步探讨。

Abstract: In this paper, the contents of REE (La, Ce, Nd, Sm, Eu, Tb, Yb and Lu),U and Th in the soils of the Songliao Plain were determined by NAA. The types of frequency distribution of concentrations for these elements were tested. The background values of 8 REE, U and Th were given.In addition, the concentrations and distribution characteristics of REE, U and Th in diff crent types of soil in this area have been also discussed.These soils are black soft, chernozem, meadow soil, brown earth, dark soft, chestnut soft, dark brown earth and lessive. The results obtained show that the contents of 8 REE, U and Th in soils of the Songliao Plain are generally close to those of world’s soil. The average value of the total REE in soil of this area is 172 ppm. The standard deviation is ±19.6 ppm and the coefficient of variation is 0.114. After normalized by mean values of chondrite, the REE patterns for different main group soils are very similar to each other, as well as to those of typical North America shales, all with negative slopes. The background values of U and Th in this area are 2.34 and 1.08 ppm, respectively. These values are also close to those of world’s soil and the average abundance of the crust. The ratio of Th and U is 4.6.