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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Europe
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Central Europe
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Czech Republic
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Primary terms
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carbon
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Cenozoic
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Quaternary
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upper Pleistocene (1)
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clay mineralogy (17)
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crystal chemistry (7)
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Europe
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Central Europe
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Czech Republic
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Bohemia
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Sokolov Basin (1)
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Germany
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isotopes
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stable isotopes
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Fe-57 (1)
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kaolin deposits (2)
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metal ores
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niobium ores (1)
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metals
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iron
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soils
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Oxisols (2)
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soils (6)
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Grey Oxisol from the Jequitinhonha Valley, Minas Gerais, Brazil: a conceptual challenge to the soil classification system?
Iron mineralogy of a grey Oxisol from the Jequitinhonha River Basin, Minas Gerais, Brazil
Iron oxide catalysts: Fenton and Fenton-like reactions - a review
An unusually thermally stable magnetite from a niobium mine in Brazil
Mössbauer spectroscopy of clays, soils and their mineral constituents
Variation of mineralogy during the beneficiation of Capim kaolin from Pará, Brazil
Characterization of a tropical soil and a waste from kaolin mining and their suitability as heterogeneous catalysts for Fenton and Fenton-like reactions
Iron mineralogy of mine-drainage precipitates as environmental indicators: review of current concepts and a case study from the Sokolov Basin, Czech Republic
The thermal reactions of montmorillonite: a Mössbauer study
The influence of octahedral and tetrahedral cation substitution on the structure of smectites and serpentines as observed through infrared spectroscopy
Spectroscopic and geochemical analyses of ferrihydrite from springs in Iceland and applications to Mars
Abstract Ferrihydrite samples were collected from a thermal spring and a cold stream in the Landmannalaugar region of Iceland. Chemical and spectroscopic analyses have been performed on the air-dried and fine-grained fractions of these samples. The ferrihydrite from the cold stream is a pure sample, containing small amounts of Ca, P and Si. The ferrihydrite from the thermal spring is a less pure sample, containing larger amounts of amorphous Si and P with some of the Si incorporated in the ferrihydrite structure. The spectral character of these Icelandic ferrihydrites is compared with those of synthetic ferrihydrites and other iron oxide/oxyhydroxide minerals. Ferrihydrite is characterized by a broad Fe 3+ excitation band near 10 900 cm −1 ( c. 0.92 μm), a strong Fe-O vibrational feature near 475 cm −1 ( c. 21 μm), and multiple bands due to H 2 O and OH. Highly pure ferrihydrite has a pair of spectral bands near 1400 and 1500 cm −1 ( c. 7 μm). Natural ferrihydrites frequently exhibit an extra band near 950–1050 cm −1 ( c. 10 μm) that is attributed to Si-O bonds. Hydrothermal springs may have been present at one time on Mars in association with volcanic activity. Ferrihydrite formation in such an environment may have contributed to the ferric oxide-rich surface material on Mars.