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Magnetic enhancement is linked to and precedes hematite formation in aerobic soil
Author(s) -
Torrent José,
Barrón Vidal,
Liu Qingsong
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl024818
Subject(s) - maghemite , hematite , magnetite , ferrimagnetism , iron oxide , geology , magnetic mineralogy , mineralogy , soil water , magnetic susceptibility , materials science , geochemistry , soil science , chemistry , remanence , metallurgy , magnetization , magnetic field , paleontology , crystallography , physics , quantum mechanics
Soil formation usually increases magnetic susceptibility, most often by increasing the concentrations of magnetite and maghemite, which are two ferrimagnetic iron oxides. Here we provide evidence that magnetic enhancement in aerobic soils not affected by detrital magnetic inputs or thermal transformation of other iron oxides is mostly due to the formation of maghemite, which is later transformed into hematite—the iron oxide that gives red color to soil. We show that the maghemite/hematite ratio is influenced by the particular environment and the degree of soil development, so it constitutes an effective tool for paleoenvironmental and planetary studies.