Jökull - 01.12.1983, Qupperneq 73

ACKNOWLEDGEMENTS
The expedition members are extremely gratejul to the
many individuals, organisations, trusts and jirms who
through their help in many dijferent directions contributed
towards its success. In particular I should like to acknow-
ledge here the advice and encouragement oj Projessor S.
Pórarinsson (University oj Iceland), Dr. S.P. Jakobsson
(Icelandic Museum oj Natural History) and Projessor
G.P.L. Walker (ex. University ojLondon).
REFERENCES
Aumento, F. 1967: Magmatic evolution on the Mid-
Atlantic Ridee. Earth Planet. Sci. Lett. 2: 225 —
230.
Baker, P.E. and F. Buckley 1964: Petrology and Geo-
chemistry of Easter Island. Contr. Mineral.
Petr. 44: 85- 100.
Carmichael, I.S.E. 1964: The Petrology of Thing-
muli, a Tertiary Volcano in Eastern Iceland, J.
Petr. 5: 435-460.
Einarsson, E.H., G. Larsen and S. Þórarinsson 1980:
The Sólheimar tephra layer and the Katla erup-
tionof~1357. ActaNat. Islandica28, 24pp.
Irvine, T.N. andW.R.A. Baragar 1971: AGuidetothe
Chemical Classification of the Common Volc-
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Jakobsson, S.P. 1972: Chemistry and Distribution
Pattern of Recent Basaltic Rocks in Iceland.
Lithos 6: 365 - 386.
Jakobsson, S.P. 1978: Environmental factors control-
ling the palagonitization of the Surtsey tephra,
Iceland. Bull. Geol. Soc. Denmark 27: Special
Issue, 91 — 105.
Jakobsson, S.P. 1979: Petrology of Recent basalts of
the Eastern Volcanic Zone, Iceland. Acta Nat.
Islandica 26, 103 pp.
Kjartansson, G.K. 1962: 1:250,000 Geological Map of
South Central Iceland (Sheet 6) - published by
the Icel. Museum afNatural History, Reykjavík.
MacDonald, fí.A. 1960: Dissimilarity ofContinental
and Oceanic RockTypes. J. Petr. 1: 172- 177.
MacDonald, G.A. 1967: Composition and Origin af
Hawaiian Lavas. Geol. Soc. Am. Mem. 116: 477
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MacDonald, G.A. and T. Katsura 1964: Chemical
Composition of Hawaiian Lavas. J. Petr. 5: 82-
133.
Sigurdsson, H. 1970: The Petrology and Chemistry
og the Setberg Volcanic Region and of the In-
termediate and Acid Rocks of Iceland. Unpubl.
Ph.D. Thesis - University ofDurham.
Steinpórsson, S. 1964: The Ankaramites of Hvamms-
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Þórarinsson, S., T. Einarsson and G.K. Kjartansson 1959:
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Manuscript accepted 10 May 1982.
ÁGRIP
KORTLAGNING GOSBERGSMYNDANA
VIÐ SÓLHEIMASAND
D. A. Carswell, Scheffieldháskóla
Sex mismunandi myndanir gosbergs koma lyrir í
jarðlagastafla, sem leiðangur frá Sheflield-háskóla
kortlagði í nágrenni Sólheimajökuls sumarið 1973.
Myndanirnar hafa að mestu orðið til við gos undir
jökli; þær eru aðskildar af roíflötum og jökulbergs-
lögum, sem rekja má nokkum veg. Efnagreiningar
voru gerðar á nokkrum bergsýnum úr þessum
stafla, og virðist alkali-innihald bergsins hafa farið
hækkandi með tímanum í þeim gosum erþama áttu
sér stað.
JÖKULL 33. ÁR 71