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Characterization of polymetamorphism in the Austroalpine basement east of the Tauern Window using garnet isopleth thermobarometry.
- Source :
-
Journal of Metamorphic Geology . Aug2006, Vol. 24 Issue 6, p451-475. 25p. 4 Diagrams, 6 Charts, 9 Graphs, 3 Maps. - Publication Year :
- 2006
-
Abstract
- Garnet in metapelites from the Wölz and Rappold Complexes of the Austroalpine basement east of the Tauern Window typically shows two distinct growth zones. A first garnet generation usually forms the cores of garnet porphyroblasts and is separated by a prominent microstructural and chemical discontinuity from a second garnet generation, which forms rims of variable width. Whereas the rims were formed during the Eo-Alpine metamorphic overprint, the garnet cores represent remnants of at least two pre-Eo-Alpine metamorphic events. The pressure and temperature estimates obtained from garnet isopleth thermobarometry applied to the first growth increments of the pre-Eo-Alpine garnet cores from the Wölz and Rappold Complexes cluster into two distinct domains: (i) in the Wölz Complex, incipient growth of the first-generation garnet occurred at 4 ± 0.5 kbar and 535 ± 20 °C, (ii) in the Rappold Complex, incipient growth of the oldest garnet cores took place at 5.3 ± 0.3 kbar and 525 ± 15 °C. The Eo-Alpine garnet generation started to grow at 6.5 ± 0.5 kbar and 540 ± 10 °C. According to radiometric dating, the low-pressure garnet from the Wölz complex was formed during a Permian metamorphic event. The first-generation garnet of the Rappold Complex is probably of Variscan age. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02634929
- Volume :
- 24
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Journal of Metamorphic Geology
- Publication Type :
- Academic Journal
- Accession number :
- 21523258
- Full Text :
- https://doi.org/10.1111/j.1525-1314.2006.00648.x