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

Ricchi, Emmanuelle; Bergemann, Christian; Gnos, Edwin; Berger, Alfons; Rubatto, Daniela; Whitehouse, Martin; Walter, Franz (2020). Cenozoic deformation in the Tauern Window (Eastern Alps) constrained by in situ Th-Pb dating of fissure monazite. Solid Earth, 11(2), pp. 437-467. Copernicus Publications 10.5194/se-11-437-2020

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Thorium–lead (Th-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 21.7 ± 0.4 to 10.0 ± 0.2 Ma. Three major periods of monazite growth are recorded between ∼ 22–20 (peak at 21 Ma), 19–15 (major peak at 17 Ma) and 14–10 Ma (major peak around 12 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 track 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Berger, Alfons and Rubatto, Daniela

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

1869-9510

Publisher:

Copernicus Publications

Funders:

[4] Swiss National Science Foundation

Language:

English

Submitter:

Daniela Rubatto

Date Deposited:

04 Aug 2020 09:39

Last Modified:

09 Aug 2020 02:43

Publisher DOI:

10.5194/se-11-437-2020

BORIS DOI:

10.7892/boris.145541

URI:

https://boris.unibe.ch/id/eprint/145541

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