Physics – Geophysics
Scientific paper
Mar 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974e%26psl..21..383p&link_type=abstract
Earth and Planetary Science Letters, Volume 21, Issue 4, p. 383-388.
Physics
Geophysics
4
Scientific paper
The Sulitjelma Gabbro situated at 67.2°N, 15.4°E was intruded close to the Late Ordovician climax of regional metamorphism in the northern Scandinavian Caledonides. Magnetic properties have been examined from samples collected at seven localities in the south western part of this body. Total NRM directions show a tendency to be aligned near the present earth's magnetic field direction in this region. Stability to a.f. demagnetisation is low and commensurate with low Koenigsberger ratios (0.001-0.16) and the presence of unoxidised magnetite as the principal remanence carrier. After cleaning the site mean directions no longer show an alignment near the present earth's field and of six statistically significant sites three are approximately reversed with respect to remainder. The combined mean direction after cleaning is D = 195°, I = 15° (precision parameter k = 6) and the derived virtual geomagnetic pole is at 0°E, 14°S (α95 = 23°). This pole is close to poles of comparable age from the British Isles and suggests that Britain and Norway were part of the same crustal plate in Ordovician times. Discrepancies between Siluro-Devonian results from the two regions may be due to inadequate age coverage of present results. Present address: Sub-department of Geophysics, University of Liverpool, Liverpool L69 3BX, England.
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