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Volume 11
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10.3390/min11060610
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Article

Dissolution-Repackaging of Hellandite-(Ce), Mottanaite-(Ce)/Ferri-Mottanaite-(Ce)

by
Maria Grazia Perna
1,
Daria Zaccaria
1,
Gianluigi Rosatelli
1,*,
Francesco Saverio Stoppani
2,
Ezio Curti
2,
John Spratt
3,
Emma Humphreys-Williams
3,
Jens Najorka
3,
Will Brownscombe
3,
Fabrizio Nestola
4 and
Francesco Stoppa
1
1
DiSPUTer, University “G. d’Annunzio” Chieti-Pescara, 66100 Chieti, Italy
2
Gruppo Mineralogico Romano, 00185 Roma, Italy
3
The Natural History Museum, London SW7 5BD, UK
4
Department of Geosciences, Padua University, 35121 Padova, Italy
*
Author to whom correspondence should be addressed.
Minerals 2021, 11(6), 610; https://doi.org/10.3390/min11060610
Submission received: 18 May 2021 / Revised: 3 June 2021 / Accepted: 4 June 2021 / Published: 7 June 2021
(This article belongs to the Special Issue Petrology and Ores of Igneous Alkaline Rocks and Carbonatites)
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Abstract

We investigated hellandite-group mineral phases from the Roman Region, alkali syenite ejecta, by multimethod analyses. They show a complex crystallisation history including co-precipitation of hellandite-(Ce) with brockite, resorption, sub-solidus substitution with mottanaite-(Ce), exsolution of perthite-like ferri-mottanaite-(Ce), overgrowth of an oscillatory-zoned euhedral shell of ferri-mottanaite-(Ce) and late, secondary precipitation of pyrochlore in the cribrose hellandite-(Ce) core. LREE/HREE crossover and a negative Eu anomaly in hellandite-group minerals follows fO2 increase during magma cooling. The distinction among the hellandite-group minerals is based on the element distribution in the M1, M2, M3, M4 and T sites. Additional information on miscibility relationship among the hellandite sensu strictu, tadzhikite, mottanaite, ferri-mottanaite and ciprianiite endmembers derives from molar fraction calculation. We observed that change in composition of hellandite-group minerals mimic the ligands activity in carbothermal-hydrothermal fluids related to carbonatitic magmatism.
Keywords: hellandite-(Ce); mottanaite-(Ce); ferri-mottanaite-(Ce); brockite; Rare Earth Elements; Roman Region—Italy hellandite-(Ce); mottanaite-(Ce); ferri-mottanaite-(Ce); brockite; Rare Earth Elements; Roman Region—Italy

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MDPI and ACS Style

Perna, M.G.; Zaccaria, D.; Rosatelli, G.; Stoppani, F.S.; Curti, E.; Spratt, J.; Humphreys-Williams, E.; Najorka, J.; Brownscombe, W.; Nestola, F.; et al. Dissolution-Repackaging of Hellandite-(Ce), Mottanaite-(Ce)/Ferri-Mottanaite-(Ce). Minerals 2021, 11, 610. https://doi.org/10.3390/min11060610

AMA Style

Perna MG, Zaccaria D, Rosatelli G, Stoppani FS, Curti E, Spratt J, Humphreys-Williams E, Najorka J, Brownscombe W, Nestola F, et al. Dissolution-Repackaging of Hellandite-(Ce), Mottanaite-(Ce)/Ferri-Mottanaite-(Ce). Minerals. 2021; 11(6):610. https://doi.org/10.3390/min11060610

Chicago/Turabian Style

Perna, Maria Grazia, Daria Zaccaria, Gianluigi Rosatelli, Francesco Saverio Stoppani, Ezio Curti, John Spratt, Emma Humphreys-Williams, Jens Najorka, Will Brownscombe, Fabrizio Nestola, and et al. 2021. "Dissolution-Repackaging of Hellandite-(Ce), Mottanaite-(Ce)/Ferri-Mottanaite-(Ce)" Minerals 11, no. 6: 610. https://doi.org/10.3390/min11060610

APA Style

Perna, M. G., Zaccaria, D., Rosatelli, G., Stoppani, F. S., Curti, E., Spratt, J., Humphreys-Williams, E., Najorka, J., Brownscombe, W., Nestola, F., & Stoppa, F. (2021). Dissolution-Repackaging of Hellandite-(Ce), Mottanaite-(Ce)/Ferri-Mottanaite-(Ce). Minerals, 11(6), 610. https://doi.org/10.3390/min11060610

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