Rit (Vísindafélag Íslendinga) - 01.06.1967, Page 100

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proton precession xnagnetometer operated from a helicopter.
Seven profiles crossing the Reykjanes Peninsula were flown at
an altitude of 600 m with a spacing of about 5 km. These mea-
surements show that the positive anomaly entering the SW
tip of the peninsula continues uninterrupted along the vol-
canic zone with a heigth of 1000—2000 gammas above the
surrounding lows.
Fig. 2 shows a typical field intensity profile across the
peninsula where a topographic profile has also been inserted.
The main anomaly is here about 12 km wide and 1500 gam-
mas high. Surface topography is seen to have only a minor
influence on the anomaly which must be produced by some
deeper lying normally magnetized material, possibly hound-
ed on both sides by rocks of reversed magnetization.
Although this anomaly is considerably smaller than the
central anomaly on the Reykjanes Ridge it seems likely that
it is produced by the same or similar material. By drilling
on the Reykjanes Peninsula it should be possible to find a
sample of this material and study its magnetic properties.
REFERENCES
Heirtzler, J. R., Le Pichon, X., Baron, J. G., 1966: Magnetic anomalies
over the Reykjanes Ridge. Deep Sea Research 13, 427—445.
(Discussion follows next paper).