Development of magnetic soil from ferroan dolomite
Development of magnetic soil from ferroan dolomite
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DOI：
10.1029/91gl02110
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发表时间：
1991-11
影响因子：
5.2
通讯作者：
A. Moukarika;F. O'Brien;J. Coey;M. Resende
中科院分区：
文献类型：
--
作者：
A. Moukarika;F. O'Brien;J. Coey;M. Resende
An occurrence of maghemitic soil in association with ferroan dolomite in Minas Gerais is characterized by X-ray diffraction, magnetization measurements and Mossbauer spectroscopy. Altered layers on outliers of dolomite, which has composition (Ca1.04Mg0.83Fe0.11Mn0.02)(CO3)2 indicate the weathering sequence: ferroan dolomite → calcite + poorly-crystallized ferric hydroxide → maghemite + hematite + goethite. The spontaneous magnetization of the maghemitic soil (65 wt% Fe2O3) is 8.8 JT−1kg−1; the magnetization of the soil maghemite itself is estimated to be 25±5 JT−1kg−1, which is greatly reduced from the value for pure maghemite because of isomorphous substitution.
