The Evolution of River Sedimentary Environment in the Maoniuping REE Deposit
详细信息
- 责任者：Yang Weihe (College of Applied Nuclear Technology and Automation Engineering ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Shi Zeming
- 刊名：Geophysical and Geochemical Exploration
- 出版年：2013
- 卷期：37(3)
- 关键词：稀土矿床 ; rare earth deposit ; 沉积环境 ; sedimentary environment ; 沉积速率 ; sedimentation rates ; 攀西裂谷 ; Panxi Rift
- 页码：p.389-393
- 图表：illus., 2 tables, 17 refs.
- 分类号：1400
- issnNo：ISSN1000-8918
- isbnNo：CN11-1906/P
摘要
Based on a systematic study of sedimentary profile from downstream of the Maoniuping REE deposit,the authors investigated the environmental impact of mine development on fluvial deposits.The results show that the sediment profile can be divided into four stages: 0 ～ 10 cm,10 ～ 30 cm,30 ～ 40 cm and 40 ～ 50 cm.The authors determined the depositional age of the sediment profiles by 210Pb.The average deposition rate of the river is 0.45 cm / a since 1910.According to the rate of sediment profiles,the deposition can be divided to four stages: The first stage is 1910 ～ 1940,whose deposition thickness is about 5 cm and whose average deposition rate is 0.168 cm / a.At this stage the content of K,Na,U,S,Mo,Mn,Pb and F decreased gradually.The second stage is 1940 ～ 1990,whose deposition thickness is about 22 cm and whose average deposition rate is 0.44 cm / a.At this stage the shallow 12 cm showed the characteristics of high pH,N,P and organic matter but low K,Na,U,S,Mo,Mn,Pb and F,whereas the deep 10 cm presented the characteristics of high K,Na,U,S,Mo,Mn,Pb and F.The third stage is 1990 ～ 1999,whose deposition thickness is about 8 cm and whose average deposition rate is 0.889 cm / a.At this stage there existed the characteristics of high pH,N,P and organic matter but low K,Na,U,S,Mo,Mn,Pb and F.The fourth stage is from 1999 up till now,whose deposition thickness is about 10 cm and whose average deposition rate is 0.909 cm / a.This stage presents the characteristics of low pH,N,P and organic matter but high K,Na,U,S,Mo,Mn,Pb and F.
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