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Deformation-induced resetting of Rb/Sr and 40Ar/39Ar mineral systems in a low-grade, polymetamorphic terrane (Eastern Alps, Austria)

WOLFGANG MÜLLER, R. DAVID DALLMEYER, FRANZ NEUBAUER and MARTIN THÖNI
Journal of the Geological Society, 156, 261-278, 1 March 1999, https://doi.org/10.1144/gsjgs.156.2.0261
WOLFGANG MÜLLER
1Institute of Geology, University of Vienna, Geozentrum, Althanstr. 14, A-1090 Vienna, Austria
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R. DAVID DALLMEYER
2Department of Geology, University of Georgia, Athens, GA 30602, USA
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FRANZ NEUBAUER
3Institute of Geology and Palaeontology, University of Salzburg, Hellbrunner Strasse 34, A-5020 Salzburg, Austria
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MARTIN THÖNI
1Institute of Geology, University of Vienna, Geozentrum, Althanstr. 14, A-1090 Vienna, Austria
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Abstract

A paradox in dating metamorphic events in low-grade, polymetamorphic terranes is exemplified by the eastern Lower Austroalpine nappes of the Eastern Alps. Here, the last metamorphic event, best recorded in post-Variscan cover rocks, is dated as Late Cretaceous in age (c. 80–85 Ma) by white mica Rb/Sr and 40Ar/39Ar systems. Within the underlying polymetamorphic basement, 40Ar/39Ar and Rb/Sr ages of phengitic white mica record only Early and/or Late Variscan ages (375–270 Ma), indicating that the Alpine greenschist facies metamorphic overprint virtually caused no rejuvenation of Variscan mineral ages.

Based on these results, the timing of a penetrative, ductile, top–to-WNW simple shear deformation recorded within both basement and cover rocks was contradictory. Deformation within the post-Variscan cover rocks had to be Alpine in age, whereas phengite 40Ar/39Ar ages from basement mylonites yield Variscan ages. To date this deformation directly, we isolated different mineral size fractions (63–30 and 30–10 μm) from highly strained shearbands within the Wechsel basement nappe. A resulting Rb/Sr errorchron pointed to an Upper Cretaceous age (c. 85 Ma) for the deformation, consistent with the timing of Alpine metamorphism in the cover rocks. Coarser-grained white mica (150–300 μim) from similar basement mylonites do not reflect any Alpine overprint of either K/Ar and/or Rb/Sr systems. It follows that dynamic re-and/or neocrystallization induced by ductile deformation within the shearbands was the dominant process by which the Rb/Sr system locally virtually re-equilibrated. This is valid even for overprinting metamorphic conditions below the temperatures required for Ar diffusional loss in phengitic white mica (c. <350°C). The data suggest that mineral ages that date low-grade mylonitization (e.g., white mica 40Ar/39Ar) should be considered with caution.

  • deformation, Rb
  • Sr, 40Ar
  • 39Ar
  • Eastern Alps
  • mylonites
  • © Geological Society of London 1999

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Journal of the Geological Society: 156 (2)
Journal of the Geological Society
Volume 156, Issue 2
March 1999
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Deformation-induced resetting of Rb/Sr and 40Ar/39Ar mineral systems in a low-grade, polymetamorphic terrane (Eastern Alps, Austria)

WOLFGANG MÜLLER, R. DAVID DALLMEYER, FRANZ NEUBAUER and MARTIN THÖNI
Journal of the Geological Society, 156, 261-278, 1 March 1999, https://doi.org/10.1144/gsjgs.156.2.0261
WOLFGANG MÜLLER
1Institute of Geology, University of Vienna, Geozentrum, Althanstr. 14, A-1090 Vienna, Austria
  • Find this author on Google Scholar
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R. DAVID DALLMEYER
2Department of Geology, University of Georgia, Athens, GA 30602, USA
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FRANZ NEUBAUER
3Institute of Geology and Palaeontology, University of Salzburg, Hellbrunner Strasse 34, A-5020 Salzburg, Austria
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MARTIN THÖNI
1Institute of Geology, University of Vienna, Geozentrum, Althanstr. 14, A-1090 Vienna, Austria
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Deformation-induced resetting of Rb/Sr and 40Ar/39Ar mineral systems in a low-grade, polymetamorphic terrane (Eastern Alps, Austria)

WOLFGANG MÜLLER, R. DAVID DALLMEYER, FRANZ NEUBAUER and MARTIN THÖNI
Journal of the Geological Society, 156, 261-278, 1 March 1999, https://doi.org/10.1144/gsjgs.156.2.0261
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