Jökull


Jökull - 01.12.1984, Side 80

Jökull - 01.12.1984, Side 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 78 JÖKULL 34. ÁR
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