Palaeomagnetism of the Askøy mafic pluton (late Precambrian), West Norway; events of Caledonian metamorphic remagnetisation

Details Palaeomagnetism of the Askøy mafic pluton (late Precambrian), West Norway; events of Caledonian metamorphic remagnetisation Palaeomagnetism of the Askøy mafic pluton (late Precambrian), West Norway; events of Caledonian metamorphic remagnetisation

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...45...85r&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 45, Issue 1, p. 85-96.

Physics

4

Scientific paper

Palaeomagnetic data from the mafic pluton of Askøy, West Norway, suggest that its original Precambrian magnetization(s) has been completely erased by Caledonian events of regional metamorphism. The present palaeomagnetic record defines two different axes of magnetization: a predominant component carried by magnetite (the B-remanence), with Dec = 025, Inc = -22 (α95 = 4°), and a subordinate magnetization carried by haematite (the A-remanence), with Dec = 318°, Inc = 8° (α95 = 10°). Comparison with Palaeozoic palaeomagnetic data for NW Europe suggests that the B-magnetization was impressed in mid-Palaeozoic time, probably in the Devonian, while the A-magnetization most likely constitutes the remains of an earlier, Upper Ordovician phase of metamorphic magnetic resetting. The palaeomagnetic evidence for metamorphic events of Ordovician and Devonian ages corroborates regional structural and reconnaissance radiometric evidence.

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