Náttúrufræðingurinn

Volume

Náttúrufræðingurinn - 1977, Page 62

Náttúrufræðingurinn - 1977, Page 62
argon and potassium. Phys. Rev., 77, 789-793. Ross, J. G. ir Mussett, A. E., 1976: Ar“>/ Ar3'J dates for spreading rates in east- ern Iceland. Nature, 259, 36—38. Sigurðsson, II1969: Nýjar aldursákvarS- anir á íslenzku bergi. Náttúrufræð- ingurinn, 38, 187-193. Sigurgeirsson, Þ., 1962: Aldursákvörðun á ungu basalti með kalíum-argon að- ferSinni. Eðlisfræðistofnun Háskól- ans, 9 bls. Tuylor, T. I. & Urey, H. C., 1938: Frac- tionation of tbe litbium and potass- ium isotopes by cbemical exchange witb zeolites. Journ. Chem. Phys., 6, 429-438. Verbeek, A. A. ir Schreiner, G. U. L., 1967: Variations in K39/K40 ratio and movement of potassium in a granite- ampbibolite contact region. Geochim. Cosmocbim. Acta, 31, 2125—2133.

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