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

Manzotti, Paola; Rubatto, Daniela; Zucali, Michele; El Korh, Afifé; Cenki-Tok, Bénédicte; Ballevre, Michel; Engi, Martin (2018). Permian magmatism and metamorphism in the Dent Blanche nappe: constraints from field observations and geochronology. Swiss journal of geosciences, 111(1-2), pp. 79-97. Birkhäuser 10.1007/s00015-017-0284-1

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Manzotti, Paola; Rubatto, Daniela; El Korh, Afifé; Cenki, Bénédicte and Engi, Martin

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

1661-8726

Publisher:

Birkhäuser

Language:

English

Submitter:

Daniela Rubatto

Date Deposited:

20 Apr 2018 08:41

Last Modified:

24 Apr 2018 01:32

Publisher DOI:

10.1007/s00015-017-0284-1

BORIS DOI:

10.7892/boris.112646

URI:

https://boris.unibe.ch/id/eprint/112646

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