Das Migmatitgebiet des ?Winnebachgranits? (�tztal-Tirol) als Beispiel einer petrotektonischen Analyse

Drong, Hans Joachim

doi:10.1007/bf01127567

Cited by 5 publications

(1 citation statement)

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“…It mainly consists of granodioritic neosome containing remnants of biotite-plagioclase gneisses and schollen of biotite schists and calc-silicate lenses, thus indicating a (Hoinkes et al 1972). the migmatite complex contains a central core unaffected by any post-Ordovician metamorphic overprint (Drong 1959;Hoinkes et al 1972). this undeformed part of the migmatite is the product of in-situ anatexis of biotite-plagioclase paragneisses (Hoinkes et al 1972;Hoinkes 1973).…”

Section: Geological Setting and Field Relationsmentioning

confidence: 99%

The metamorphic evolution of migmatites from the Ötztal Complex (Tyrol, Austria) and constraints on the timing of the pre-Variscan high-T event in the Eastern Alps

et al. 2008

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Within the Ötztal complex (Öc), migmatites are the only geological evidence of the pre-Variscan metamorphic evolution, which led to the occurrence of partial anatexis in different areas of the complex. We investigated migmatites from three localities in the Öc, the Winnebach migmatite in the central part and the Verpeil-and Nauderer Gaisloch migmatite in the western part. We determined metamorphic stages using textural relations and electron microprobe analyses. Furthermore, chemical microprobe ages of monazites were obtained in order to associate the inferred stages of mineral growth to metamorphic events. All three migmatites show evidence for a polymetamorphic evolution (pre-Variscan, Variscan) and only the Winnebach migmatite shows evidence for a P-accentuated Eo-Alpine metamorphic overprint in the central Öc. the P-t data range from 670-750 °c and < 2.8 kbar for the pre-Variscan event, 550-650 °c and 4-7 kbar for the Variscan event and 430-490 °c and ca. 8.5 kbar for the P-accentuated Eo-Alpine metamorphic overprint. U-th-Pb electron microprobe dating of monazites from the leucosomes from all three migmatites provides an average age of 441 ± 18 Ma, thus indicating a pervasive Ordovician-silurian metamorphic event in the Öc.

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