Iron isotope fractionation in river colloidal matter

被引:95
作者
Ingri, Johan [1 ]
Malinovsky, Dmitry
Rodushkin, Ilia
Baxter, Douglas C.
Widerlund, Anders
Andersson, Per
Gustafsson, Orjan
Forsling, Willis
Ohlander, Bjorn
机构
[1] Lulea Univ Technol, Div Appl Geol, SE-97187 Lulea, Sweden
[2] Analyt AB, SE-97775 Lulea, Sweden
[3] Swedish Museum Nat Hist, Lab Isotope Geol, SE-10405 Stockholm, Sweden
[4] Stockholm Univ, Inst Appl Environm Res ITM, SE-10691 Stockholm, Sweden
[5] Lulea Univ Technol, Div Chem, SE-97187 Lulea, Sweden
关键词
Fe isotopes; Kalix River; suspended matter; Fe-colloids; temporal variation;
D O I
10.1016/j.epsl.2006.03.031
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
Temporal variations in the iron isotopic composition, delta Fe-56 between -0.13 parts per thousand and 0.31 parts per thousand, have been measured in the suspended fraction in a Boreal river. The major mechanism behind these variations is temporal mixing between two types of particles-colloids, Fe-oxyhydroxides and Fe-C colloids. Data in this study indicate that these two types of colloids have different Fe-isotope composition. The Fe-C colloid has a negative delta Fe-56 value whereas the Fe-oxyhydroxide colloid is enriched in Fe-56. These two types of colloidal matter have different hydrogeochemical origin. The Fe-C colloid reaches the river during storm events when the upper sections of the soil profile (O and E horizons) are flooded by a rising water table. Colloidal Fe-oxyhydroxides reach the river via inflow and subsequent oxidation of groundwater enriched in dissolved Fe(II). (c) 2006 Published by Elsevier B.V.
引用
收藏
页码:792 / 798
页数:7
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