Jökull - 01.12.1984, Blaðsíða 80

pared to those collected from Jan Mayen and the
Faeroes.
It is not clear from these publications or from
Charcot’s book “Dans la mer du Groenland“ to
what extent Chevallier and Mercanton collabo-
rated in their research in Iceland. Chevallier
wrote a book on his travels: “Au pied des volcans
polaires“ (1927), but does not describe his
magnetic measurements in any detail there.
As stated in my 1982 paper, the next scientist
to seriously study the paleomagnetism of Ice-
landic formations was in all likelihood the Dutch-
man J. Hospers, currently a Professor at the
Norwegian Technical University in Trondheim. I
have come across a paper by him in Dutch (Hos-
pers 1954) which I have not seen referred to in
the literature previously. It contains essentially
the same information as his 1953-54 papers in
English.
A collaboration between Sigurður Thorarins-
son and Thorbjörn Sigurgeirsson on paleomagne-
tic work on the Svinafell deposits in SE-Iceland is
described in a paper by Thorarinsson (1963), but
was not continued further.
Among the massive output of important papers
from the Liverpool University research group, I
inadvertently left out one by Watkins and
Haggerty (1967), dealing with within-lava varia-
tions in several magnetic properties. An interes-
ting Liverpool thesis on the magnetic properties
of highly oxidized olivine grains in Icelandic and
other basalts (Riding 1969) does not seem to have
been published in the form of papers. A short
note by Smith (1967) on the optical properties of
certain paleomagnetically useful lava flows also
deserves mention.
Magnetic measurements on cores recovered in
the vicinity of Iceland by the Deep Sea Drilling
Project are reported in vols. 12, 38 (suppl.) and
49 of the Initial Reports of the DSDP.
For completeness, I shall list here also the titles
of some paleo- and rock magnetic papers pub-
lished in 1982. Most notable of these are the
series of papers on the Reydarfjördur deep drill
hole and surroundings (Helgason 1982, Bleil etal.
1982, Schönharting and Ghisler 1982, Schönhar-
ting and Hall 1982). Among the most important
aspects of these papers is the fact that paleo-
magnetic polarity mapping proved very helpful in
stratigraphic correlation between the core and
the exposed sequence to the east. However,
strong and stable overprinting of magnetization
was noted in the vicinity of dykes, especially in
the epidote zone of alteration. This may be due
to the formation of secondary magnetite.
In another drilling effort, Grommé (1982)
describes accurate work on the origin of reman-
ent magnetization in Surtsey tuffs.
The first scientific description of the geo-
magnetic field in Icelandic may be found in Fis-
cher’s (1852) monograph on Physics, pp. 347-
352. It states that the origins of observed varia-
tions of the field are unknown, but many expect
them to be due to variations in air temperature.
ACKNOWLEDGEMENT
The search for early references was carried out
at the excellent library facilities of Oregon State
University in Corvallis.
ÁGRIP
f nýlegri yfirlitsgrein höfundar um niðurstöður
segulmælinga á íslensku bergi, láðist að geta
nokkurra allmerkra heimilda á þessu fræðasviði.
Par á meðal var stutt grein frá 1930 um mælingar
á fjórum bergsýnum úr Þurárhrauni í Ölfusi, og
endar sú grein á hinum spámannlegu orðum, að
rannsókna á fleiri sýnum sé þörf áður en draga
megi almennar álýktanir.
REFERENCES
Bleil, U., J.M. Hall, H. P. Johnson, S. Levi and
G. Schönharting 1982: The natural magnetiza-
tion of a 3-km section of Icelandic crust. J.
Geophys. Res. 87: 6569—6590.
Chevallier, R. 1930a: Aimantation naturelle de
laves polaires. Bull. bi-mensuel Soc. Fr. Phys.
no. 295: 116 (abstract).
Chevallier, R. 1930b: Aimantation permanente
de laves d’Islande et de Jan Mayen. Comptes
Rendus Acad. Sci. Fr. 190: 686—689.
Fischer, J.G. 1852: Eðlisfræði (transl. into Ice-
landic by M.Grímsson), 462 pp. Hið íslenska
Bókmenntafélag, Copenhagen.
Grommé, S. 1982: Origin of natural remanent
magnetization of tephra from the 1979 Surtsey
drill hole, Iceland. Surtsey Res. Progr. Rept.
IX: 111-116.
Helgason, J. 1982: Magnetostratigraphy of the
exposed lava section east of the IRDP drill
hole in Reydarfjordur, Eastern Iceland. J.
Geophys. Res. 87: 6396—6404.
Hospers, J. 1954: De natuurlijke magnetizatie
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