Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1972, Page 22

Náttúrufræðingurinn - 1972, Page 22
98 NÁTTÚRUFRÆÐINGURINN Karl Grönvold var mér mjög hjálplegur við samningu þessarar greinar, einnig Sigurður Þórarinsson, sem lagði til eina teikninguna. Pétur Sigurjónsson lét mér í té niðurstöður um þenslueiginleika og efnasamsetningu glersalla og perlu- steins. Þakka ég þeim öllum aðstoðina. HEIMILDARIT Bailey, D. K. and Macdonald, R., 1970: Petrochemical variations among mildly peralkaline (comendite) obsidians from the oceans and continents. Contr. Mineral. and Petrol. 28: 340—351. Kjartansson, G., 1962: Jarðfræðikort af íslandi 1:250.000, blað 6, Miðsuðurland. Menningarsjóður. Pálmason, G., Friedman, J. D., Williams Jr, R. S., Jónsson J. and Sœmundsson, K., 1970: Aerial infrared surveys of Reykjanes and Torfajökull thermal areas, Iceland with a section on cost of exploration surveys. Geothermics 2, 1: 399-412. Sœmundsson, K., 1969: Infrared Imagery of Torfajökull thermal Area. National Energy Authority—Report. Mimeographed. Thorarinsson, S., 1961: Eldstöðvar og hraun. „Náttúra íslands" 65—93. Almenna bókafélagið. — 1967: Hekla and Katla, discussion. í „Iceland and Mid-Ocean Ridges.“ Soc. Sci. Isl. Rit 38: 190-199. — 1968: Heklueldar: 1—187. Sögufélagið í Reykjavík. — 1969: Ingimbrít í Þórsmörk. Náttúrufræðingurinn 39: 139—155. — 1970: Tephrochronology and Medieval Iceland in „Scientific Methods in Medieval Archeology": 295—328. University of Calif. Press. — 1971: Landmannalaugar. Atlantica &: Iceland Review 9,2: 16—22. Thoroddsen, Th., 1959: Ferðabók 2. bindi, önnur útg. Snæbjörn Jónsson, Reykja- vík. Walker, G. P. L., 1964: Geological investigations in Eastern Iceland. Bull. Vol- canol, 27: 351-363. SUMMARY Notes on the geology of the Torfajökull central volcano by Kristján Sœmundsson. National Energy Authority, Laugavegur 116, Reykjavík. Since the last interglacial period the Torfajökull central volcano in South Iceland has been the site of copious rhyolitic volcanism, the products of which cover an area approximately 450 km2 in size. The oldest rocks are rhyolite ílows exposed mainly near the north and south margins of the area. They were

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