pure and applied geophysics

, Volume 135, Issue 1, pp 15-29

First online:

Correlation of strain with anisotropy of magnetic susceptibility (AMS)

  • Graham J. BorradaileAffiliated withDepartment of Geology, Lakehead University

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Existing correlations between strain and anisotropy of low-field magnetic susceptibility (AMS) have been re-assessed using a single parameter to express both anisotropies. TheP′ parameter (Hrouda, 1982) shows potential as a powerful single expression of the intensity of strain and of AMS. Previous correlations are improved by use of this parameter. Cautious optimism is justified for correlations between strain and susceptibility in a certain strain window between a lower limit (excluding the incomplete overprint of predeformation anisotropy) and an upper limit (excluding the effects of saturation anisotropy). For successful correlations the influence of stress-controlled recrystallisation should be minimal and the mineralogical sources of susceptibility must predate deformation.

Key words

Magnetic susceptibility strain anisotropy magnetic fabric