Jökull - 01.07.2003, Page 30

Leó Kristjánsson
100
100
200
20
0
30
0
Si
Sk
B
E
F
L
Eh H
V
A
63°54
63°53
22°1520’
0 1 km 2
Figure 4. Stippled: outcrops of the Skálamælifell excursion, Reykjanes peninsula. Si: Siglubergsháls. Sk:
Skálamælifell. H: Höfði. E: Einbúi. L: Langihryggur. Eh: Einihlíðar. A,V: Austara and Vestara Hrauns-
sels-Vatnsfell (acc. to 1:50,000 maps). B: Borgarfjall. Slaga is south of Borgarfjall; Sandfell is south of the
two Hraunssels-Vatnsfells; Fiskidalsfjall, Festarfjall and Lyngfell lie around Siglubergsháls; Stórihrútur is the
peak northeast of Langihryggur. Hatched: Area in Fagradalsfjall (F) where outcrops of lavas having southerly
declinations are found. – Á gráleitu svæðunum koma fyrir hraunlög runnin þegar segulskautið lá sunnan við
miðbaug. Á skástrikaða svæðinu í Fagradalsfjalli eru opnur í hraunlög frá tíma þegar segulskautið var stutt
norðan miðbaugs.
PALEOMAGNETIC SAMPLING ON THE
REYKJANES PENINSULA
Introduction - previous work
At the suggestion of the late Prof. Þ. Einarsson of the
University of Iceland, Á. Guðmundsson and J. Í. Pét-
ursson carried out a field survey of magnetic polari-
ties at a number of lava sites in the Reykjanes penin-
sula in the mid-1970’s. Most of these sites exhib-
ited normal polarity, as could be expected, but sev-
eral did not yield clear polarities. Guðmundsson and
the present author initiated sampling of anomalous
sites for laboratory measurements of remanence in
1977–1978. Some of these turned out to be affected
by lightning strikes, while others had reliable direc-
tions with low negative inclinations and westerly de-
clinations. Kristjánsson andGuðmundsson (1980) de-
scribed measurements on these low-inclination units
28 JÖKULL No. 52, 2003