Mineralogy and chemistry of ochre sediments from an acid mine drainage near a disused mine in Cornwall, UK

被引:18
|
作者
Singh, B
Wilson, MJ
McHardy, WJ
Fraser, AR
Merrington, G
机构
[1] Univ Reading, Dept Soil Sci, Reading RG6 6DW, Berks, England
[2] Macaulay Land Use Res Inst, Aberdeen AB15 8QH, Scotland
[3] Bournemouth Univ, Dept Conservat Sci, Poole BH12 5BB, Dorset, England
关键词
D O I
10.1180/claymin.1999.034.2.09
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ochre sediments from acid mine drainage in Cornwall have been investigated using X-ray diffraction, thermal methods, infrared spectroscopy, X-ray photoelectron spectroscopy: transmission electron microscopy and chemical methods in order to determine their mineralogical and chemical composition. Fresh sediments consist of ferrihydrite and goethite. Large fractions of these minerals are dissolved by the ammonium oxalate treatment reflecting their poorly crystalline structure. Fresh sediments contain large amounts of surface-adsorbed SO4 (up to 9.3%) which is readily desorbed by the PO4 treatment. Goethite is the only mineral present in relatively older sediments and the mineral is well crystallized with rod-shaped morphology. Environmental conditions, such as pH and SO4 content, are not favourable for the presence of schwertmannite at the site. Iron minerals appear to be precipitating around filamentous algae and the shape of algae is preserved in the Fe oxide matrix. The ubiquitous presence of algae in close association with Fe minerals indicate their possible role in the crystallization of Fe oxides.
引用
收藏
页码:301 / 317
页数:17
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