Jökull - 01.12.1977, Síða 27

rent rifting episode in North Iceland. Na-
ture 266: 318-323.
lijörnsson, Helgi, 1973: Freezing on a rotary
drill in temperate glacier ice. Jökull 23:
53-54.
— 1974: Explanation of jökulhlaups from
Grímsvötn, Vatnajökull, Iceland. Jökull 24:
1-26.
— 1977: The Cause of the jökulhlaups in
Skaftá River, Vatnajökull. Jökull 27: 71—78.
Dansgaard, IV., 1961: The isotopic composition
of natural waters. Medd. om Gr0nland.
165 No. 2.
Dansgaard, W., S. J. Johnsen, J. Mtj>ller, ir C. C.
Langway, Jr., 1969: One thousand centuries
of climatic record from Camp Century on
the Greenland ice sheet. Science 166: 377—
381.
Egilson, Davið, 1974: Athuganir á gjallfalli í
Heimaeyjargosi 1973. [Observations on the
tephra from the Heimaey eruption in 1973].
Unpublished B.S. thesis, University of Ice-
land, 45 pp. (In Icelandic).
Glen, J. W., 1955: The creep of polycrystalline
ice. l’roc. Roy. Soc. Lond. A 228: 519-538.
Holtzscherer, J. J., 1954: Expedition Franco-
Islandaise au Vatnajökull mars-avril 1951.
Resultats des sondages seismologiques. Jök-
ull 4: 1-33.
Johnsen, S. J., W. Dansgaard, H. II. Clausen ir
C. C. Langway, 1970: Climatic oscillations
1200-2000 AD. Nature 277 No. 5257: 482-
483.
Júnsson, Ólafur, 1945: Ódáðahraun II. 447 pp.
Norðri, Akureyri (In Icelandic).
Mouritzen, M. ir A. Noe-Nygaard, 1950: Vol-
canic ash from the Grímsvötn eruption in
1903. Medd. Dansk Geol. Foren. 71: 583—
584.
Persson, Chr., 1966: Undersökning av tre sura
asklager pá Island. [Observations on three
acid tephra layers in Icelancl]. Geol. Fören.
Förhandl. 88: 500—519. (In Swedish).
Larsen, Gudriin: 1975: Gjóskulagið H4. [The
tephra layer H4]. Unpublished B.S. thesis,
University of Iceland, 70 pp. (In Icelandic).
Muehlenbachs, K., A. T. Anderson, J., ir G. E.
Sigvaldason, 1974: Low-O18 basalts from
Iceland. Geochim. Cosmochim. Acta 38:
577-588.
Saemundsson, K., 1974: Evolution of the axial
rifting zone in northern Iceland and thc
Tjörnes fracture zone. Geol. Soc. Amer.
Bulletin 85: 495-504.
Sheridan, M. F., 1971: Particle size characteri-
stics of pyroclastic tuffs. J. Geophys. Res.
76: 5627-5634.
Sigurdsson, Sven Þ., 1970: Gravity survey on
western Vatnajökull. Jökull 20: 38—44.
Sigvaldason, G. E., 1974: Tlie Petrology of
Hekla and Origin of Silicic Rocks in Ice-
land. In The Eruption of Hekla 1947-1948.
V. 1. Soc. Sci. Isl. 44 pp.
Sigvaldason, G. E. ir S. Steinthórsson, 1974:
Chemistry of tholeiitic basalts from Iceland
ancl their relation to the Kverkfjöll hot
spot. In L. Kristjánsson (ed.): Geodynamics
of Iceland and the North Atlantic Area.
D. Reidel Publ. pp. 155-164.
Sigvaldason, G. E., S. Steinthórsson, N. Óskars-
son ir P. Imsland, 1976: The simultaneous
production of basalts enriched and depleted
in large lithophilic trace ions. Bull. Soc.
Géol. Fran?. (7) t. XVIII, no. 4, p. 863-
867.
Sparks, S. R. J., H. Sigurdsson, ir L. Wilson,
1977: Magma mixing: A mechanism for
triggering acid explosive eruptions. Nature
267: 315-318.
Steingrimsson, Jón, 1783: Fullkomið skrif um
Síðueld. [A complete description of the
Lakagígar Fires]. In Safn til sögu Islands
IV, Copenhagen and Reykjavík 1907—15,
pp. 1—57. (In Icelandic).
Theodórsson, Páll, 1977: 40-year tritium pro-
files in a polar ancl a temperate glacier. In
Isotopes and Impurities in Snow and Ice.
Proceed. of the Grenoble Symposium, Aug./
Sept. 1975, IAHS Publ. No. 118, pp. 393-
398.
Thorarinsson, S., 1944: Tefrokronologiska stu-
dier pá Island. [Tephrochronological stu-
dies in Iceland]. Geogr. Ann. Stockh. 26:
1—217 (in Swedish).
— 1950: Glacier outbursts in tlie river Jökulsá
á Fjöllum. (Icel. witli English abstract).
Náttúrufr. 20: 113-133.
— 1953: Some new aspects of the Grímsvötn
problem. J. Glaciol. 2: 267—274.
— 1955: Mælingaleiðangur á Vatnajökul vorið
1955. [An expedition to Vatnajökull in the
spring 1955]. Jökull 5: 27—29. (In Icelandic).
JÖKULL27. ÁR 25