Török Kálmán: New data on the geothermometry and geobarometry of the Somogy-Drava Basin, SW. Transdanubia, Hungary. In: Acta mineralogica-petrographica, (31). pp. 13-23. (1990)
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Abstract
The mineral assemblages of the medium grade polymetamorphic rocks of the Somogy-Dráva Basin are rich in critical minerals which make it possible to expand our knowledge on the metamorphic p—T evolution of the area using mineral equilibria and different geothermo-barometric methods. Previous studies (ÁRKAI 1984; ÁRKAI et al. 1985) revealed three metamorphic events. Applying four geothermo-barometric methods which provided consistent data with the mineral assemblage, the estimated p—T conditions were about 500—1030 Mpa and 539—685°C during the first metamorphic event. The second, low pressure metamorphism produced 4 different mineral assemblages which crystallized as a result of different reactions during the prograde metamorphism. 1/ andalusite+biotite +/- staurolite relics 2/ andalusite+garnet+biotite (sometimes with sillimanite and staurolite relics) 3/ andalusite+biotite+cordierite +/- sillimanite, garnet, plagioclase, muscovite, with rare staurolite relics in the andalusite. 4/ andalusite+biotite+staurolite, where the andalusite and the staurolite crystallized simultaneously along with the biotite. These mineral assemblages refer to a maximum temperature of about 600°C. There is only a few geothermo-barometric data on the second stage of the metamorphism which show pressures consistent with the mineral assemblages (200—350 Mpa) but the temperatures seem to be a little low (520—536 °C). The third, retrograde metamorphism, related to milonitisation, was a very low-low grade one which usually did not exceed the biotite isograde (ÁRKAI 1984), disregarding some exceptional cases.
| Item Type: | Article |
|---|---|
| Journal or Publication Title: | Acta mineralogica-petrographica |
| Date: | 1990 |
| Volume: | 31 |
| ISSN: | 0365-8066 |
| Page Range: | pp. 13-23 |
| Language: | English |
| Publisher: | University of Szeged, Department of Mineralogy, Geochemistry and Petrology |
| Place of Publication: | Szeged |
| Related URLs: | http://acta.bibl.u-szeged.hu/39409/ |
| Uncontrolled Keywords: | Kőzettan, Ásványtan, Földtan |
| Additional Information: | Bibliogr.: p. 22-23. ; ill. ; összefoglalás angol nyelven |
| Subjects: | 01. Natural sciences 01. Natural sciences > 01.05. Earth and related environmental sciences |
| Date Deposited: | 2016. Oct. 17. 09:25 |
| Last Modified: | 2022. Jul. 26. 15:58 |
| URI: | http://acta.bibl.u-szeged.hu/id/eprint/24780 |
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