Timing of high-pressure metamorphism and exhumation of the eclogite type-locality (Kupplerbrunn-Prickler Halt, Saualpe, south-eastern, Austria): constraints from correlations of the Sm-Nd, Lu-Hf and Rb-Sr isotopic systems. (Articolo in rivista)

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  • Timing of high-pressure metamorphism and exhumation of the eclogite type-locality (Kupplerbrunn-Prickler Halt, Saualpe, south-eastern, Austria): constraints from correlations of the Sm-Nd, Lu-Hf and Rb-Sr isotopic systems. (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1111/j.1525-1314.2008.00778.x (literal)
Alternative label
  • Thöni M.; Miller C.; Blichert-Toft J.; Whitehouse M.J.; Konzett J.; Zanetti A. (2008)
    Timing of high-pressure metamorphism and exhumation of the eclogite type-locality (Kupplerbrunn-Prickler Halt, Saualpe, south-eastern, Austria): constraints from correlations of the Sm-Nd, Lu-Hf and Rb-Sr isotopic systems.
    in Journal of metamorphic geology
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Thöni M.; Miller C.; Blichert-Toft J.; Whitehouse M.J.; Konzett J.; Zanetti A. (literal)
Pagina inizio
  • 561 (literal)
Pagina fine
  • 581 (literal)
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  • 26 (literal)
Rivista
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  • 21 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Thöni M. a; Miller C. b; Blichert-Toft J. c; Whitehouse M.J. d; Konzett J. b; Zanetti A. e: a Center for Earth Sciences, University of Vienna, Althanstrasse 14, A-1090 Wien, Austria; b Institut fur Mineralogie und Petrographie, University of Innsbruck, Innrain 52, A-6020 Innsbruck, Austria; c Laboratoire des Sciences de la Terre, CNRS UMR 5570, Ecole Normale Supe´rieure de Lyon, 46, Allee d'Italie, 69364 Lyon Cedex 7, France; d Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden; e CNR-Istituto di Geoscienze e Georisorse, Unita`di Pavia, via Ferrata 1, I-27100 Pavia, Italy (literal)
Titolo
  • Timing of high-pressure metamorphism and exhumation of the eclogite type-locality (Kupplerbrunn-Prickler Halt, Saualpe, south-eastern, Austria): constraints from correlations of the Sm-Nd, Lu-Hf and Rb-Sr isotopic systems. (literal)
Abstract
  • Sm-Nd, Lu-Hf, Rb-Sr and SIMS U-Pb data are presented for meta-gabbroic eclogites from the eclogite type-locality (Hauy, 1822) Kupplerbrunn-Prickler Halt and other areas of the Saualpe (SE Austria) and Pohorje Mountains (Slovenia). Mg-rich eclogites derived from early gabbroic cumulates are kyanite- and zoisite rich, whereas eclogites with lower Mg contents contain clinozoisite ± kyanite. Calculated P-T conditions at the final stages of high-pressure metamorphism are 2.2 ± 0.2 GPa at 630-740 °C. Kyanite-rich eclogites did not yield geologically meaningful Sm-Nd ages due to incomplete Nd isotope equilibration, whereas Sm-Nd multifraction garnet-omphacite regression for a low-Mg eclogite from Kupplerbrunn yields an age of 91.1 ± 1.3 Ma. The Sm-Nd age of 94.1 ± 0.8 Ma obtained from the Fe-rich core fraction of this garnet dates the initial stages of garnet growth. Zircon that also crystallized at eclogite facies conditions gives a weighted mean U-Pb SIMS age of 88.4 ± 8.1 Ma. Lu-Hf isotope analysis of a kyanite-eclogite from Kupplerbrunn yields 88.4 ± 4.7 Ma for the garnet-omphacite pair. Two low-Mg eclogites from the Gertrusk locality of the Saualpe yield a multimineral Sm-Nd age of 90.6 ± 1.0 Ma. A low-Mg eclogite from the Pohorje Mountains (70 km to the SE) gives a garnet-whole-rock Lu-Hf age of 93.3 ± 2.8 Ma.These new age data and published Sm-Nd ages of metasedimentary host rocks constrain the final stages of the eo-Alpine high-pressure event in the Saualpe-Pohorje part of the south-easternmost Austroalpine nappe system suggesting that garnet growth in the high-pressure assemblages started at c. 95-94 Ma and ceased at c. 90-88 Ma, probably at the final pressure peak. Zircon and amphibole crystallization was still possible during incipient isothermal decompression. Rapid exhumation of the high-pressure rocks was induced by collision of the northern Apulian plate with parts of the Austroalpine microplate, following Jurassic closure of the Permo-Triassic Meliata back-arc basin. (literal)
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