Acta Geologica Hungarica
Volume/Issue:
Volume 47: Issue 4
Facies analysis of marine Permian/Triassic boundary sections in Hungary
Authors:
János Haas Geological Research Group of the Hungarian Academy of Sciences H-1117 Budapest, Pázmány P. sétány 1/c, Hungary

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Kinga Hips Geological Research Group of the Hungarian Academy of Sciences H-1117 Budapest, Pázmány P. sétány 1/c, Hungary

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Pál Pelikán Geological Institute of Hungary, Budapest H-1143 Budapest, Stefánia út 14, Hungary

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Norbert Zajzon Department of Mineralogy and Petrology, University of Miskolc H-3515 Miskolc, Egyetemváros, Hungary

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Annette E. Götz Martin Luther University, Halle-Wittenberg D-06099 Halle, Germany

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Edit Tardi-Filácz Geological Research Group of the Hungarian Academy of Sciences H-1117 Budapest, Pázmány P. sétány 1/c, Hungary

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Pages:
297–340
Online Publication Date:
19 Jul 2005
Publication Date:
01 Dec 2004
Article Category:
Research Article
DOI:
https://doi.org/10.1556/ageol.47.2004.4.1
Keywords:
Transdanubian Range; biofacies; Transdanubian Range; Permian/Triassic boundary; Bükk Mts; lithofacies; biofacies
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The Permian/Triassic boundary was recognized in continuous marine successions in several outcrops in the Bükk Mts, North Hungary and in a few core sections in the northeastern part of the Transdanubian Range. In the Bükk Mts, of four studied boundary sections only two proved to be complete. They represent an outer ramp setting. In these sections the topmost Permian is made up of dark gray limestone, rich in fragments of crinoids, calcareous algae, mollusks, brachiopods, ostracods, and foraminifera. There is a dramatic decrease in the amount of the bioclasts in the last two limestone layers, which are overlain by a 1 m-thick shale bed. The lower two-thirds of this bed still contain Permian fauna but its upper part is almost free of bioclasts. The overlying platy limestone contains a pauperized fossil assemblage indicating stress conditions. The two core sections studied in the Transdanubian Range represent an inner ramp setting. The uppermost Permian is made up of lagoonal-sabkha cycles. It is overlain by subtidal packstone-grainstone, rich in Late Permian fossils. Oolitic facies characterizes the boundary interval. Onset of ooid formation was probably the consequence of biotic decline leading to cessation of skeletal carbonate production. Along with oolite beds, stromatolites, micrite with "microspheres" and fine siliciclastic microlayers characterize the basal Triassic succession, reflecting overall stress conditions and the changing energy of the depositional environment.

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Cover Acta Geologica Hungarica
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)

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