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1 Studia Geologica Polonica

1 2004

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Dinocyst assemblages recovered from Jurassic strata of the Grajcarek Unit, Pieniny Klippen Belt, Poland, add new important data on their stratigraphic ages. The Jurassic ages of the Szlachtowa Formation flysch strata (Toarcian-Aalenian) and the Opaleniec

Birkenmajer K., Pécskay Z., Szeliga W.

Studia Geologica Polonica

2004

Vol. 123

279-294

In the Pieniny Volcanic Arc (Miocene), the northernmost volcanic arc of the West Carpathians, hydrothermal activity produced some ore-bearing veins associated with moderate-size andesite intrusions. They were subjected to prospecting and mining for gold, silver and lead for a short period at the beginning of the 18th century. K-Ar dating of secondary chlorine-biotite from the mineralized zone at Mt Jarmuta, yielded a K-Ar date of 11.35š0.45 Ma. This K-Ar date fits well with the average K-Ar age (11.34š0.50 Ma) obtained on unaltered andesite sills exposed at Mt Jarmuta. It indicates a close age-relationship between the emplacement of the andesite intrusion and the subsequent ore-mineralization during Miocene (Sarmatian) time.