K/Ar ages in the case of correlated K and excess Ar concentrations: a case study for the alkaline olivine basalt of Somoska, Slovak- Hungarian frontier

K. Balogh, D. Vass, L. Ravasz-Baranyai

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12 Citations (Scopus)

Abstract

K/Ar ages were determined for different fractions of the alkaline olivine basalt of Somoska, located on the Slovak-Hungarian frontier. The K/Ar ages range from 7.27 Ma to 4.65 Ma and isochron ages show great scatter from 6.02 Ma to 4.31 Ma; the fit of the points to the straight lines is poor. It has been demonstrated, that a linear relation of K and Ar(ex) concentrations may cause erroneously old isochron ages. On the basis of correlation of K and Ar(atm) concentrations in the fractions of the Somoska basalt, similar relation between the K and Ar(ex) contents could not be excluded, thus, the reality of the K/Ar as well as the isochron ages remained questionable. However, by selecting fractions of similar Ar(atm) concentrations, very accurate isochron ages of 4.06 ± 0.06 Ma and 4.08 ± 0.03 Ma were obtained. -from Authors

Original languageEnglish
Pages (from-to)97-102
Number of pages6
JournalGeologica Carpathica
Volume45
Issue number2
Publication statusPublished - 1994

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K/Ar ages in the case of correlated K and excess Ar concentrations : a case study for the alkaline olivine basalt of Somoska, Slovak- Hungarian frontier. / Balogh, K.; Vass, D.; Ravasz-Baranyai, L.

In: Geologica Carpathica, Vol. 45, No. 2, 1994, p. 97-102.

Research output: Contribution to journalArticle

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