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

Rok, strany: 1994, 97 - 102

K/Ar ages (prepared by magnetic and heavy liquid separation) 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 a similarly 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, which are interpreted in terms of the real age of Somoska basalt and in the same time demonstrate the use of Ar(atm) content for the evaluation of isochron ages.

ISO 690:

Balogh, K., Vass, D., Ravasz-Baranyai, L. 1994. 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. In Geologica Carpathica, vol. 45, no.2, pp. 97-102. 1335-0552.

APA:

Balogh, K., Vass, D., Ravasz-Baranyai, L. (1994). 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. Geologica Carpathica, 45(2), 97-102. 1335-0552.