International Geological Journal - Official Journal of the Carpathian-Balkan Geological Association

Metamorphosed and ductilely deformed conodonts from Triassic limestones situated beneath ophiolite complexes: Kopaonik Mountain (Serbia) and Bükk Mountains (NE Hungary) — a preliminary comparison

Pages: 157 - 176

Authors: MILAN SUDAR, SANDOR KOVACS

Abstract: Metamorphosed and ductilely deformed conodonts with CAI (Colour Alteration Index) values 5–7 are described and illustrated from Kopaonik Mt, Vardar Zone, Serbia and from Bükk Mts, NE Hungary. They derive from Upper Triassic cherty metalimestones, overthrust by ophiolite complexes. The metamorphism and ductile deformation of the conodont elements evidently took place simultaneously with those of the limestone host rocks, which might have been related to subduction and obduction; however, younger tectonometamorphic events could also have played a role. Unfortunately, illite “crystallinity” indices from Kopaonik Mt are too random for thermometric assessment and geochronological data are missing so far. Nevertheless, by comparison with published data about limestone textural alteration and with previously published metamorphic petrological data from NE Hungary, at least a Szendrõ-type (min. 400 °C, but less then 500 °C, temperature and 300 MPa pressure) can be supposed for the regional metamorphism of conodont-bearing cherty limestone series of Kopaonik Mt.

Keywords: Serbia (Vardar Zone), NE Hungary, ductile deformation, regional metamorphism, limestone textural alteration, conodont alterations

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