IDENTIFICATION OF FERROMAGNETIC MINERALS IN A ROCK BY COERCIVITY AND UNBLOCKING TEMPERATURE PROPERTIES

被引:1325
作者
LOWRIE, W
机构
[1] Institut Für Geophysik, Eth, Zürich
关键词
D O I
10.1029/GL017i002p00159
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The common ferromagnetic minerals have distinctive, characteristic coercivities and thermomagnetic properties. The analysis of the acquisition curve of isothermal remanent magnetization (IRM) is a useful but often ambiguous diagnostic technique. For a more conclusive interpretation, IRM acquisition must be combined with subsequent thermal demagnetization of the IRM. A modification of this method is proposed as a more powerful analytical technique. Different coercivity fractions of IRM are remagnetized in successively smaller fields along three orthogonal directions. The thermal demagnetization of each orthogonal component of the composite IRM is then plotted separately. This method often gives a clearer interpretation of the ferromagnetic mineral content of a rock. Examples are described for limestone and sandstone samples. © 1990 by the Chinese Geophysical Society
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页码:159 / 162
页数:4
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