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

METAMORPHIC EVOLUTION OF GABBROIC ROCKS OF THE BÓDVA VALLEY OPHIOLITE COMPLEX, NE HUNGARY

Pages: 121 - 129

Authors: PETER HORVATH

Abstract: The Alpine polyphase metamorphic evolution path of the Bódva Valley Ophiolite Complex was reconstructed using mineral paragenetic observations, mineral chemical and thermobarometric data obtained on metagabbroic samples from boreholes in the Rudabanya Mts., NE Hungary. The dismembered ophiolite complex forms part of the Meliata Unit of the Inner Western Carpathians. The recognizable, first blueschist facies event (min. 700–800 MPa, 350–500 °C) was followed by a nearly isothermal decompression to 400–600 MPa in the greenschist facies. The following metamorphic event was characterized by temperature increase up to 500–600 °C in isobaric conditions to the albite-epidote-amphibolite facies. The P-T path is best explained by subduction, which was followed by uplift without any significant change in the temperature conditions. The late temperature increase might be caused by thermal relaxation following subduction.

Keywords: Inner Western Carpathians, Rudabanya Mts., ophiolite complex, gabbro, metamorphism

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