Origin of magnetic fabrics in ultramafic rocks
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Date
2015-04-24
Publication Type
Conference Paper
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yes
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Abstract
The magnetic fabric of a rock, defined by the anisotropy of magnetic susceptibility (AMS), is often used as a tectonic indicator. In order to establish a quantitative relationship between AMS and mineral texture, it is important to understand the single crystal intrinsic AMS of each mineral that contributes to the AMS of the rock. The AMS and crystallographic preferred orientation (CPO) of amphiboles, olivine and pyroxenes has been analyzed in a series of amphibolites, peridotites and pyroxenites that do show preferred mineral alignment. The CPO of each mineral phase was determined based on electron backscatter diffraction (EBSD). Whole- rock AMS was computed based on the CPO and single crystal AMS of the respective minerals. A comparison between measured and modelled magnetic anisotropy shows that the directions of the principal susceptibility axes agree well in amphibolite and peridotite. Pyroxenite is a good example for competing AMS fabrics in polyphase rocks.
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published
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Volume
82 (1)
Pages / Article No.
12098
Publisher
IOP Publishing
Event
17th International Conference on Textures of Materials (ICOTOM 2014)
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02891 - ScopeM / ScopeM
03392 - Burg, Jean-Pierre (emeritus)
03734 - Jackson, Andrew / Jackson, Andrew