Magnetic fabric interpretation complicated by inclusions in mafic silicates

被引:61
作者
Lagroix, F [1 ]
Borradaile, GJ [1 ]
机构
[1] Lakehead Univ, Dept Geol, Thunder Bay, ON P7B 5E1, Canada
关键词
anisotropy of anhysteretic remanence magnetization (AARM); anisotropy of magnetic susceptibility (AMS); crystallography; mafic sillicates; petrofabrics;
D O I
10.1016/S0040-1951(00)00125-6
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The expected relationships between anisotropy of low-field magnetic susceptibility (AMS) and crystal symmetry of mafic silicates are disturbed by the presence of magnetite inclusions. Measurements of AMS, anisotropy of anhysteretic remanence (AARM) and theoretically predicted bulk susceptibilities from chemical composition all favour the exercise of great caution in the interpretation of preferred orientation distributions of silicates from a rock's AMS. These results pertain mainly to the mafic silicates of lower crustal rocks (pyroxene, orthopyroxene, amphibole) and some of their low-grade metamorphic alterations (serpentine, epidote). (C) 2000 Elsevier Science B.V. All rights reserved.
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页码:207 / 225
页数:19
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