New age data on the low-temperature regional metamorphism of Mt. Medvednica (Croatia)

Katalin Judik; Kadosa Balogh; Darko Tibljaš; Péter Árkai

doi:10.1556/ageol.49.2006.3.2

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Acta Geologica Hungarica

Volume/Issue:: Volume 49: Issue 3

New age data on the low-temperature regional metamorphism of Mt. Medvednica (Croatia)

Authors:

Katalin Judik

Katalin Judik
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Kadosa Balogh

Kadosa Balogh
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Darko Tibljaš

Darko Tibljaš
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Péter Árkai

Péter Árkai
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Pages:: 207–221

Online Publication Date:: 15 Jun 2007

Publication Date:: 01 Sep 2006

Article Category:: Research Article

DOI:: https://doi.org/10.1556/ageol.49.2006.3.2

Keywords:: Mt. Medvednica; Croatia; low-temperature metamorphism; illite-K-white mica; NE Hungary; Alpine metamorphism; K-Ar geochronology; geochronological correlation

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K-Ar age data of illite-K-white mica-rich, <2 µm grain size fraction samples were determined on various lithotypes of the Paleozoic-Mesozoic, very low- to low-grade metamorphic complex, the Jurassic ophiolitic mélange and the Cretaceous-Paleocene sedimentary sequence of Mt. Medvednica, Croatia. K-Ar ages of the high-temperature anchizonal-epizonal Paleozoic-Mesozoic complex scatter around ca. 110 Ma for slates, phyllites and marbles with phyllite intercalations, while they are significantly younger (ca. 80 Ma) for metavolcanoclastic rocks that are devoid of detrital K-white mica. Beside the Cretaceous (Alpine) K-Ar radiometric age data, no evidence of a possibly older, Variscan metamorphic event was detected. In the Jurassic ophiolitic mélange and the Cretaceous-Paleocene sequence the obtained mixed isotopic age data do not provide reliable estimates for the age of the diagenetic alterations. In the Paleozoic and Mesozoic formations from the Bükk, Szendrõ and Uppony Mts. (NE Hungary) and in the Paleozoic rocks series from the Internal Dinarides, similar Alpine (Cretaceous) K-Ar ages were determined. These data may suggest metamorphic processes related to the subduction of the Dinaridic oceanic crust beneath Eurasia accompanied by compressional crustal thickening.

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Acta Geologica Hungarica

Print ISSN:: 0236-5278

Online ISSN:: 1588-2594

Acta Geologica Hungarica
Language	English
Size
Year of Foundation	1952
Publication Programme	changed title
Volumes per Year
Issues per Year
Founder	Magyar Tudományos Akadémia
Founder's Address	H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher	Akadémiai Kiadó
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5278 (Print)
ISSN	1588-2594 (Online)