Articles | Volume 32, issue 5
https://doi.org/10.5194/ejm-32-521-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/ejm-32-521-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
15 Oct 2020
Research article |
| 15 Oct 2020
| 15 Oct 2020
Corona formation around monazite and xenotime during greenschist-facies metamorphism and deformation
Felix Hentschel
CORRESPONDING AUTHOR
Department for Earth and Environmental Sciences,
Ludwig-Maximilians-Universität München, Munich, Germany
Emilie Janots
Univ. Grenoble 1, ISTerre, Grenoble, France
Claudia A. Trepmann
Department for Earth and Environmental Sciences,
Ludwig-Maximilians-Universität München, Munich, Germany
Valerie Magnin
Univ. Grenoble 1, ISTerre, Grenoble, France
Pierre Lanari
Univ. Bern, Institute of Geological Sciences, Bern, Switzerland
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We used microscopy and electron backscatter diffraction to analyse the deformation behaviour of feldspar at greenschist facies conditions in mylonitic pegmatites of the Austroalpine basement. There are strong uncertainties about feldspar deformation, mainly because of the varying contributions of different deformation processes. We observed that deformation is mainly the result of coupled fracturing and dislocation glide, followed by growth and granular flow.
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Cindy L. Urueña, Charlotte Möller, and Anders Plan
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Members of the epidote supergroup, epidote, clinozoisite, allanite, and ferriallanite, are described from the calcium–aluminum silicate and thermometamorphic zones in drill cores obtained from the Mofete and San Vito wells in the Campi Flegrei (Italy) geothermal field. Compositional zoning is ubiquitous. The epidote group encompasses nearly the complete range of coupled Al–Fe3+ substitution, and the allanite group is light rare earth element enriched.
Elena V. Belogub, Vladimir V. Shilovskikh, Konstantin A. Novoselov, Ivan A. Blinov, and Ksenia A. Filippova
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We found Ca- and S-rich rhabdophane in the upper part of the oxidation zone of a sulfide occurrence, where it forms spherules up to 35 µm in size and aggregates in fractures in goethite. Its formation is probably associated with desorption of REEs from Fe3+ oxyhydroxides and clay minerals in the oxidation zone and the influx of P from the soil as well as from the precursor rocks. The enrichment with REE phosphate in the studied case is similar to that in REE regolith-hosted deposits.
Harvey E. Belkin and Ray Macdonald
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Zr-bearing accessory minerals in granites from Scotland and Northern Ireland, UK, have been examined with a scanning electron microscope and their compositions analyzed by electron microprobe. Four types of zircon were identified: magmatic, late-stage magmatic, and two hydrothermal types. Baddeleyite, dalyite, zirconolite, a eudialyte-group mineral, probable lemoynite, and Zr-bearing aegirine were also identified. These accessory minerals are used to help define the magmatic environment.
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Short summary
We analysed apatite–allanite/epidote coronae around monazite and xenotime in deformed Permian pegmatites from the Austroalpine basement. Microscopy, chemical analysis and EBSD showed that these coronae formed by dissolution–precipitation processes during deformation of the host rocks. Dating of monazite and xenotime confirmed the magmatic origin of the corona cores, while LA-ICP-MS dating of allanite established a date of ~ 60 Ma for corona formation and deformation in the Austroalpine basement.
We analysed apatite–allanite/epidote coronae around monazite and xenotime in deformed Permian...
