Abundance and fractionation patterns of rare earth elements in streams affected by acid sulphate soils

被引:92
作者
Åström, M [1 ]
机构
[1] Abo Akad Univ, Dept Geol & Mineral, SF-20500 Turku, Finland
关键词
rare earth elements; fractionation; stream; acidity; acid sulphate soil; leaching;
D O I
10.1016/S0009-2541(00)00294-1
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The abundance and shale-normalised fractionation patterns of rare earth elements (REEs) were studied in 121 streams of first and second order in an area where acid sulphate soils. developed on oxidised sulphide-bearing marine sediments. are abundant. During high-water flow events in autumn, on which this study focuses, the leaching of REEs from the acid sulphate soils is extensive, resulting in high total REE concentrations (up to > 1 mg/l) in streams draining such soils exclusively. In these streams, there is a general depletion of the heavy REEs explained by preferential scavenging of the latter by oxyhydroxides in the deepest soil-profile horizons. In streams draining areas of glacial till and peat, the REE concentrations are several orders of magnitude lower. In these streams, in contrast to the REE-enriched streams, there is a depletion of light REEs explained most likely by preferential complexation of the middle and heavy REEs by dissolved humic substances. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:249 / 258
页数:10
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