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Permian magmatism and metamorphism in the Dent Blanche nappe: constraints from field observations and geochronology

  • Manzotti, Paola Institute of Earth Sciences, University of Lausanne, Switzerland
  • Rubatto, Daniela Institute of Earth Sciences, University of Lausanne, Switzerland - Institute of Geological Sciences, University of Bern, Switzerland - Research School of Earth Sciences, Australian National University, Canberra, Australia
  • Zucali, Michele Dipartimento di Scienze della Terra, Università degli Studi di Milano, Italy
  • El Korh, Afifé Institute of Geological Sciences, University of Bern, Switzerland - Unit of Earth Sciences, Department of GeosciencesUniversity of Fribourg, Switzerland
  • Cenki-Tok, Bénédicte Géosciences Montpellier, Université Montpellier, France
  • Ballèvre, Michel Géosciences Rennes, Université Rennes, France
  • Engi, Martin Institute of Geological Sciences, University of Bern, Switzerland
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    01.04.2018
Published in:
  • Swiss Journal of Geosciences. - 2018, vol. 111, no. 1–2, p. 79–97
English In the Dent Blanche Tectonic System, the Mont Morion biotite-bearing granite is a km- scale intrusion preserved in a low-strain volume. Zircon saturation thermometry suggests that it crystallised from a melt that reached about 800 °C. U–Pb zircon and allanite geochronology indicates crystallization of the magma in the Permian (290 ± 3 Ma; 280 ± 8 Ma, respectively). Migmatitic biotite-gneiss and amphibolite are found as xenoliths within the Mont Morion granite and constitute its country-rocks. In two samples of migmatitic biotite-gneiss zircon has metamorphic overgrowths that yield U–Pb ages of 285 ± 3 Ma and 281 ± 4 Ma, and are thus contemporaneous with the intrusion of the granite. The Mont Morion granite with its country-rocks of migmatitic biotite-bearing gneiss and amphibolite was thus emplaced at middle crustal levels while amphibolite facies metamorphism affected its country rocks. The magmatic and metamorphic record in the Mont Morion area reflects the high-temperature regime and lithospheric thinning of the Adriatic continental margin during Permian.
Faculty
Faculté des sciences et de médecine
Department
Département de Géosciences
Language
  • English
Classification
Geology
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/306573
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