K/Ar ages measured in the usual way were 25–45% younger, but after HCl treatment of the rock, or after reducing the baking temperature of the argon extraction line from 250°C to 150°C, they became similar to the Ar/Ar ages.All Ar/Ar determinations were performed after HF treatment.HCl treatment dissolved olivine, nepheline, leucite, magnetite and from 1-1 sample analcime or calcite.K dissolution studies from different locations of Hegyestü have shown that K content is mostly ≈2%, but it may decrease to ≈0.3%.
The diagram shows that a change of the structure in the 145–295°C range caused the loss of 40Ar(rad).On fractions of HCl treated rock 7.56±0.17 Ma isochron K/Ar age has been determined. cookies, tags, and tracking settings to store information that help give you the very best browsing experience.To understand more about cookies, tags, and tracking, see our Privacy Statement *Prices in US$ apply to orders placed in the Americas only. The Bakony-Balaton Highland Volcanic Field (BBHVF) is located in the central part of Transdanubia, Pannonian Basin, with over 50 alkali basaltic volcanoes.
Prices in GBP apply to orders placed in Great Britain only. The basanite plug of Hegyestu erupted in the first phase of volcanic activity. K/Ar and Ar/Ar ages of the leucite-bearing basanite of Hegyestás were conflicting.
Prices in € represent the retail prices valid in Germany (unless otherwise indicated). This is caused by the special Ar retention feature of leucite in this basanite.