Palaeomagnetic resetting in the Barrovian zones of Scotland and its relationship to the late structural history

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Scientific paper

The haematite schists in the lowest kyanite and the staurolite Barrovian zones exposed in Glen Lethnot and Glen Esk, Angus, Scotland, have a characteristic magnetization with blocking temperatures generally greater than 600°C and less than 695°C and coercivity greater than 200 mT. The mean palaeomagnetic direction derived from 54 samples collected from N = 10 sites is D = 159°, I = 45°, k = 47, α95 = 7.1° with the associated south pole position of lat. = -3° , long. = 22°E, dp = 5.7° and dm = 9.0°. This magnetization is younger than folds of D3 generation and older than folds of D4 generation. The pole position falls on the Aberdeenshire polar wander track in a place consistent with an average K-Ar biotite chrontour age of 455 m.y. A comparison of the blocking temperatures of magnetization to the estimated peak temperature of metamorphism suggest the magnetization is a chemical remanent magnetization (CRM) possibly acquired during the metamorphic chemical reactions.
Now at Department of Geology, The University, Glasgow G12 8QQ, U.K.

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