High-pressure metamorphism and P-T path of the metaliasic rocks in the borehole Komjáti-11, Bódva valley area, NE Hungary
The Alpine, polyphase, regional metamorphic evolution was revealed by mineral paragenetic, mineral chemical and chlorite crystallinity studies carried out on a representative profile of the incomplete, dismembered ophiolite complex of the Bódva Valley area (Aggtelek-Rudabánya Mts., NE Hungary). This...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1997
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| Sorozat: | Acta mineralogica-petrographica
38 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24855 |
| Tartalmi kivonat: | The Alpine, polyphase, regional metamorphic evolution was revealed by mineral paragenetic, mineral chemical and chlorite crystallinity studies carried out on a representative profile of the incomplete, dismembered ophiolite complex of the Bódva Valley area (Aggtelek-Rudabánya Mts., NE Hungary). This complex belongs to the South Gemer nappe system and represents a strongly tectonized part of the Mesozoic Vardar-Meliata oceanic branch of the Neotethys. On the basis of the first description of Na-amphiboles (ferro-glaucophane and riebeckite) and the discrimination of magmatic and metamorphic Ca-amphiboles, the P-T-relative time path of the metabasic rocks was reconstructed as follows. The most probably Middle Jurassic, subduction-related epidote-blueschist fades event (ca. 7 kbar, 300-350°C) was followed by a (probably Middle Cretaceous) greenschist facies regional metamorphism (ca. 4-5 kbar, 300°C). In contrast with the earlier studies (RÉTI, 1985) no signs of an ocean-floor hydrothermal event could be proved. Thus, the present study provides the first evidence of subduction-related high-pressure assemblages in the ophiolitic rocks from the Hungarian part of Meliaticum. |
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| Terjedelem/Fizikai jellemzők: | 151-163 |
| ISSN: | 0365-8066 |