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Journal of the Geological Society; 2005; v. 162; issue.4; p. 583-586;
DOI: 10.1144/0016-764904-144
© 2005 Geological Society of London

Short Communication

Degree of magnetic anisotropy as a strain intensity gauge in ferromagnetic granites

Koushik Sen, Sukhen Majumder & Manish A. Mamtani

Department of Geology & Geophysics, Indian Institute of Technology, Kharagpur-721302, India (e-mail: mamtani@gg.iitkgp.ernet.in)

Anisotropy of magnetic susceptibility data for a ferromagnetic granite (Godhra Granite, NW India) are presented and it is shown that the degree of magnetic anisotropy (P') is not controlled by the mean susceptibility (Km). Analyses carried out across a high-strain zone lying between granite and adjacent gneiss show that P' values are highest in samples that lie close to the contact and decrease away from it. Based on these results it is concluded that if P' is not controlled by Km, then the former can be used to gauge strain-intensity variations in ferromagnetic granites.

Key Words: anisotropy of magnetic susceptibility • strain • ferromagnetic minerals • granites