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1 Studia Geologica Polonica

1 2000

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Early Cretaceous K-Ar age of a large basalt olistolith at Biała Woda, Pieniny Klippen Belt, West Carpathians, Poland

Birkenmajer Krzysztof, Pécskay Zoltán

Studia Geologica Polonica

2000

Vol. 117

27--35

K-Ar dating of a large basalt olistolith, part of the Upper Cretaceous Jarmuta Formation conglomerate, at Biała Woda, Pieniny Klippen Belt (Western Carpathians), yielded two K-Ar ages: 110.6 ą 4.2 Ma and 120.3 ą 4.5 Ma, from columnar-jointed, and platy-jointed parts of the basalt, respectively. The age difference between these dates might reflect two successive Early Cretaceous volcanic events: (i) platy-jointed basalt being an older event, and (ii) columnar-jointed basalt being a younger one. The basaltic rock discussed was long believed to represent a Miocene intrusion in the Upper Cretaceous Jarmuta Formation conglomerates. The first radiometric dating (1987) of the basalt yielded a K-Ar age of 140 ą 8 Ma (Jurassic-Cretaceous boundary). The present dating refines the age of the basalt at Early Cretaceous (Aptian-Albian), thus confirming its position as an olistolith in the Upper Cretaceous conglomerates of the Pieniny Klippen Belt.