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https://doi.org/10.5194/ejm-37-1-2025
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the Creative Commons Attribution 4.0 License.
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https://doi.org/10.5194/ejm-37-1-2025
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the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
06 Jan 2025
Research article |
| 06 Jan 2025
| 06 Jan 2025
Insights from the compositional evolution of a multi-coloured, zoned tourmaline from the Cruzeiro pegmatite, Minas Gerais, Brazil
Giovanni B. Andreozzi
CORRESPONDING AUTHOR
Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
CNR–IGAG c/o Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
Claudia Gori
independent researcher: Largo Gaetano De Sanctis, 7, 00179 Rome, Italy
Henrik Skogby
Department of Geosciences, Swedish Museum of Natural History, P.O. Box 50007, 10405 Stockholm, Sweden
Ulf Hålenius
Department of Geosciences, Swedish Museum of Natural History, P.O. Box 50007, 10405 Stockholm, Sweden
Alessandra Altieri
Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
Ferdinando Bosi
Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
CNR–IGAG c/o Department of Earth Sciences, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy
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Eur. J. Mineral., 36, 797–811, https://doi.org/10.5194/ejm-36-797-2024, https://doi.org/10.5194/ejm-36-797-2024, 2024
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The discovery of the K-dominant tourmaline maruyamaite with microdiamond inclusions suggested its ultrahigh-pressure formation. We analyzed the role of K in the tourmaline structure, with a special focus on its stability. High pressure is necessary to squeeze the large cation K+ in the stiff framework of tourmaline, although K is the underdog component if Na+ is present in the mineralizing fluid. K-tourmaline is stable at high pressure, overcoming the stereotype of a mere crustal component.
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Elba tourmaline crystals commonly display a sharp transition to dark colors at the analogous termination, but the mechanisms leading to the formation of such terminations are unclear. Here we propose a general genetic model in which, as a consequence of a pocket rupture event, chemical alteration of early formed Fe-/Mn-rich minerals in the enclosing pegmatite was responsible for the release of Fe and/or Mn in the geochemical system, allowing the formation of the late-stage dark terminations.
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Eur. J. Mineral., 36, 1005–1010, https://doi.org/10.5194/ejm-36-1005-2024, https://doi.org/10.5194/ejm-36-1005-2024, 2024
Ferdinando Bosi, Frédéric Hatert, Marco Pasero, and Stuart J. Mills
Eur. J. Mineral., 36, 917–923, https://doi.org/10.5194/ejm-36-917-2024, https://doi.org/10.5194/ejm-36-917-2024, 2024
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The discovery of the K-dominant tourmaline maruyamaite with microdiamond inclusions suggested its ultrahigh-pressure formation. We analyzed the role of K in the tourmaline structure, with a special focus on its stability. High pressure is necessary to squeeze the large cation K+ in the stiff framework of tourmaline, although K is the underdog component if Na+ is present in the mineralizing fluid. K-tourmaline is stable at high pressure, overcoming the stereotype of a mere crustal component.
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Eur. J. Mineral., 36, 525–528, https://doi.org/10.5194/ejm-36-525-2024, https://doi.org/10.5194/ejm-36-525-2024, 2024
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Eur. J. Mineral., 35, 1027–1030, https://doi.org/10.5194/ejm-35-1027-2023, https://doi.org/10.5194/ejm-35-1027-2023, 2023
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Eur. J. Mineral., 35, 891–895, https://doi.org/10.5194/ejm-35-891-2023, https://doi.org/10.5194/ejm-35-891-2023, 2023
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Short summary
The compositional variation in a multi-coloured, zoned tourmaline from the Cruzeiro pegmatite, Brazil, reflects melt chemical evolution during the entire pegmatite differentiation. In uncontaminated granitic pegmatite systems such as that of Cruzeiro, the compositional evolution of tourmaline progresses from schorl to fluor-elbaite, rather than directly from schorl to elbaite, to reflect co-enrichment in Li and F during fractional crystallization.
The compositional variation in a multi-coloured, zoned tourmaline from the Cruzeiro pegmatite,...
