Journal
JOURNAL OF METAMORPHIC GEOLOGY
Volume 24, Issue 6, Pages 451-475Publisher
WILEY-BLACKWELL PUBLISHING, INC
DOI: 10.1111/j.1525-1314.2006.00648.x
Keywords
Austroalpine basement; garnet; metapelite; Rappold Complex; Wolz Complex
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Garnet in metapelites from the Wolz 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 Wolz and Rappold Complexes cluster into two distinct domains: (i) in the Wolz Complex, incipient growth of the first-generation garnet occurred at 4 +/- 0.5 kbar and 535 +/- 20 degrees C, (ii) in the Rappold Complex, incipient growth of the oldest garnet cores took place at 5.3 +/- 0.3 kbar and 525 +/- 15 degrees C. The Eo-Alpine garnet generation started to grow at 6.5 +/- 0.5 kbar and 540 +/- 10 degrees C. According to radiometric dating, the low-pressure garnet from the Wolz complex was formed during a Permian metamorphic event. The first-generation garnet of the Rappold Complex is probably of Variscan age.
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