European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 35, issue 6
Articles | Volume 35, issue 6
https://doi.org/10.5194/ejm-35-1125-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-35-1125-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 35, issue 6
Research article
 | 
14 Dec 2023
Research article |  | 14 Dec 2023

Retrogression of ultrahigh-pressure eclogite, Western Gneiss Region, Norway

Dirk Spengler, Adam Włodek, Xin Zhong, Anselm Loges, and Simon J. Cuthbert

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Latest update: 02 Nov 2025
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Short summary
Rock lenses from the diamond stability field (>120 km depth) within ordinary gneiss are enigmatic. Even more when these lenses form an alternating exposure pattern with ordinary lenses. We studied 10 lenses from W Norway and found that many of them have a hidden history. Tiny needles of quartz enclosed in old pyroxene cores are evidence for a rock origin at great depth. These needles survived the rocks' passage to the surface that variably obscured the mineral chemistry – the rocks' memory.
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(Ultra)high-pressure metamorphism, from crystal to orogenic...