Physics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.2043m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Nov. 1991, p. 2043-2046.
Physics
11
Dolomite (Mineral), Geochemistry, Magnetic Properties, Soil Science, Magnetization, Mossbauer Effect, Spectroscopic Analysis, X Ray Diffraction
Scientific paper
An occurrence of maghemitic soil in association with ferroan dolomite in Minas Gerais is characterized by X-ray diffraction, magnetization measurements, and Moessbauer spectroscopy. Altered layers on outliers of dolomite, which has composition (Ca1.04Mg0.83Fe0.11Mn0.02)(CO3)2 indicate the weathering sequence: ferroan dolomite yields calcite + poorly-crystallized ferric hydroxide yields maghemite + hematite + goethite. The spontaneous magnetization of the maghemitic soil is 8.8/JT/kg; the magnetization of the soil maghemite itself is estimated to be 25 +/- 5/JT/kg, which is greatly reduced from the value for pure maghemite because of isomorphous substitution.
Coey J. M. D.
Moukarika A.
O'Brien F.
Resende Mauro
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