European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 35, issue 4
Articles | Volume 35, issue 4
https://doi.org/10.5194/ejm-35-645-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-35-645-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 35, issue 4
Research article
 | 
15 Aug 2023
Research article |  | 15 Aug 2023

Provenance, protolith and metamorphic ages of jadeite-bearing orthogneiss and host paragneiss at Tavagnasco, the Sesia Zone, Lower Aosta Valley, Italy

Jane A. Gilotti, William C. McClelland, Simon Schorn, Roberto Compagnoni, and Matthew A. Coble

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Latest update: 22 Apr 2025
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Short summary
We show that metamorphosed sedimentary rocks in the Western Alps have a detrital zircon signature that connects them to the Adrian plate along the Gondwana margin. We used zircon to learn that a jadeite-bearing orthogneiss intruded into these strata in the Ordovician (at ~460 Ma) and was metamorphosed at high pressure during early Alpine subduction of Adria beneath Europe at ~78 Ma. Our results are consistent with the complex subduction of Adria before full-on collision with the European plate.
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(Ultra)high-pressure metamorphism, from crystal to orogenic...