.1 Hornblende diorite Ditrău-Tulgheş road, km 7 40 Ar/ 39 Ar amphibole 231.5 ± 0.1 Pană et al. (2000) Syenite Jolotca, Jolotca creek U–Pb zircon 229.6 +1.7/−1.2 The first K/Ardating of whole rock samples (hornblendite, syenite, granite, nepheline syenite) was
-Baranyai, K. Balogh, E. Árva-Sós 1979: K/Ardating of miocene piroclastic rocks in Hungary. - Ann. Géol. Pays. Hellén Tome horsserie, 1979/2, pp. 491 - 500 .
K/Ardating of miocene piroclastic rocks in Hungary
The40Ar/39Ar technique is an analytical variation of the K–Ar dating method. A known fraction of the39K in a sample is converted to39Ar by irradiation with fast neutrons. In an incremental heating experiment, the argon is released from the sample fractionally by stepwise heating. The result is a series of apparent ages.40Ar/39Ar age spectrum was determined for the sample Oase Vestfold. The minimum of the saddle-shaped age spectrum gives 1.0 billion years.
The Tokaj Mts, situated in the northeastern part of the inner arc of the Carpathians, forms a part of a Miocene calc-alkaline andesitic-dacitic-rhyolitic volcanic island arc. The ancient volcanic structures were reconstructed on the basis of the 1:50 000-scale and 22 sheets of the 1:25 000-scale geologicpetrologic maps, as well as the revision of the volcanic facies in 150 boreholes. Multispectral and SAR satellite imagery, aerial photos, data and maps of airborne geophysical surveys (magnetic and radiometric), gravity-filtered anomaly maps, geochemical (soil and stream sediment Au, As, Sb, Hg) concentration distribution maps and the K/Ar dating of 132 samples from 80 paleomagnetic measurements were also used.
The anomalies were only taken into consideration in the interpretation if the coincident results of at least 3 methods indicated the presence of any volcanic structure. In consequence, 91 map-scale volcanic structures were identified by morphology — complex calderas, single lava domes, volcanic fissures, subvolcanic intrusions, diatremes, stratovolcanoes and postvolcanic formations. Conclusions were also drawn regarding the link to the volcanic structures and prospective occurrences of the mineral resources of the Tokaj Mts: andesite, dacite, welded zeolitic tuff, K-metasomatite, perlite, pitchstone, pumice, bentonitic, illitic, kaolinitic, diatom-bearing and silicified lacustrine sediments, hydrothermal Au-Ag and Pb-Zn veins, and Hg stockwerks.
Balogh, K. 1985: K/Ardating of Neogene volcanic activity in Hungary: Experimental technique, experiences and methods of chronological studies. - ATOMKI Rep. D/1, pp. 277-288.
K/Ardating of Neogene volcanic
. Ravaszné Baranyai, Kad. Balogh, E. Árva-Soós 1979: K/Ardating of Miocene pyroclastic rocks in Hungary. - Annales Géologiques des Pays Hellenéniques. Hors Série., 2, pp. 491 - 501 .
K/Ardating of Miocene pyroclastic rocks in
, Little Plain, W-Hungary: K-Ardating of K-white micas from very low-and low-grade metamorphic rocks. - Acta Geol. Hung., 32/1-2 , pp. 131-147.
The age of metamorphism of the East Alpine type basement, Little Plain, W-Hungary: K-Ar
., Pécskay, Z., Ravasz-Baranyai, L. 1986: K/Ardating of post-Sarmatian alkali basaltic rocks in Hungary. - Acta Mineralogica and Petrographica, Acta Universitatis Szegediensis, 28, pp. 75-93.
K/Ardating of post-Sarmatian alkali