K-Ar dating of the Miocene andesite intrusions, Pieniny Mts, West Carpathians, Poland

Krzysztof Birkenmajer, Z. Pécskay

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

K-Ar dating was carried out on whole rock, groundmass and monomineral (amphibole, feldspar) fractions of andesite intrusions from the Pieniny Mts (West Carpathians, Poland). Most of the K-Ar ages range between ca 13.5 and ca 11 Ma. It means that the andesitic magmatism took place during the Sarmatian (Late Miocene). In spite of the obvious geological relationships between the first and the second phase intrusions, the relative timing of their emplacement has not yet been established. Probably, these intrusions are closer to each other in geological age than it could be expected from their analytical errors. Radiometric ages determined on hornblende and feldspar, which in many cases seem to be older than the real geological ages, may indicate the presence of some excess argon. This can be a result of insufficient degassing of the magma or the presence of xenocrysts.

Original languageEnglish
Pages (from-to)155-169
Number of pages15
JournalBulletin of the Polish Academy of Sciences, Earth Sciences
Volume47
Issue number2-3
Publication statusPublished - 1999

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andesite
Miocene
feldspar
argon
degassing
hornblende
amphibole
magmatism
emplacement
magma
dating
rock

Keywords

  • Andesite intrusions
  • K-Ar dating
  • Late Miocene
  • West Carpathians

ASJC Scopus subject areas

  • Geology

Cite this

K-Ar dating of the Miocene andesite intrusions, Pieniny Mts, West Carpathians, Poland. / Birkenmajer, Krzysztof; Pécskay, Z.

In: Bulletin of the Polish Academy of Sciences, Earth Sciences, Vol. 47, No. 2-3, 1999, p. 155-169.

Research output: Contribution to journalArticle

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