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Discussion papers
https://doi.org/10.5194/se-2019-162
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2019-162
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 30 Oct 2019

Submitted as: research article | 30 Oct 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

Cenozoic deformation in the Tauern Window (Eastern Alps, Austria) constrained by in-situ Th-Pb dating of fissure monazite

Emmanuelle Ricchi1, Christian A. Bergemann1,2, Edwin Gnos2, Alfons Berger3, Daniela Rubatto3,4, Martin J. Whitehouse5, and Franz Walter6 Emmanuelle Ricchi et al.
  • 1Department of Earth Sciences, University of Geneva, Rue des Maraîchers 13, 1205 Geneva, Switzerland
  • 2Natural History Museum of Geneva, Route de Malagnou 1, 1208 Geneva, Switzerland
  • 3Institute of Geological Sciences, University of Bern, Baltzerstrasse 1+3, 3012 Bern, Switzerland
  • 4Institute of Earth Sciences, University of Lausanne, Geopolis, Lausanne, 1015 Switzerland
  • 5Swedish Museum of Natural History, Box 50007, SE104-05 Stockholm, Sweden
  • 6Institut für Erdwissenschaften, Karl-Franzens-Universität, Universitätsplatz 2, 8010 Graz, Austria

Abstract. Thorium-Pb crystallization ages of hydrothermal monazites from the western, central and eastern Tauern Window provide new insights into Cenozoic tectonic evolution of the Tauern metamorphic dome. Growth domain crystallization ages range from 22.3 ± 0.6 Ma to 7.7 ± 0.9 Ma. Three major periods of monazite growth are recorded between ~ 22–19 (peak at 21 Ma), 19–15 (major peak at 17 Ma) and 13–8 Ma (major peaks at 12, 10 and 8 Ma), respectively interpreted to be related to prevailing N-S shortening, in association with E-W extension, beginning strike-slip movements, and reactivation of strike-slip faulting. Fissure monazite ages largely overlap with zircon and apatite fission tracks data. Besides tracking the thermal evolution of the Tauern dome, monazite dates reflect episodic tectonic movement along major shear zones that took place during the formation of the dome. Geochronological and structural data from the Pfitschtal area in the western Tauern Window show the existence of two cleft generations separated in time by 4 Ma and related to strike-slip to oblique-slip faulting. Moreover, these two phases overprint earlier phases of fissure formation.

Emmanuelle Ricchi et al.
Emmanuelle Ricchi et al.
Emmanuelle Ricchi et al.
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Short summary
This study investigates Cenozoic deformation during cooling and exhumation of the Tauern metamorphic and structural dome, Eastern Alps, through Th-Pb dating of fissure monazite-(Ce). Fissure (or hydrothermal) monazite-(Ce) typically crystallises in a temperature range of 400–200 °C. Three major episodes of monazite growth occurred at ca. 21, 17 and 12–8 Ma, corroborating previous crystallization and cooling ages.
This study investigates Cenozoic deformation during cooling and exhumation of the Tauern...
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