Szczegóły publikacji
Opis bibliograficzny
Towards Zn-dominant tourmaline: a case of Zn-rich fluor-elbaite and elbaite from the Julianna system at Piława Górna, Lower Silesia, SW Poland / Adam PIECZKA, Bożena GOŁĘBIOWSKA, Piotr JELEŃ, Adam WŁODEK, Eligiusz Szełęg, Adam Szuszkiewicz // Minerals [Dokument elektroniczny]. — Czasopismo elektroniczne ; ISSN 2075-163X. — 2018 — vol. 8 iss. 4 art. no. 126, s. 1–21. — Wymagania systemowe: Adobe Reader. — Bibliogr. s. 18–21, Abstr. — Publikacja dostępna online od: 2018-03-22
Autorzy (6)
- AGHPieczka Adam
- AGHGołębiowska Bożena
- AGHJeleń Piotr
- AGHWłodek Adam
- Szełęg Eligiusz
- Szuszkiewicz Adam
Słowa kluczowe
Dane bibliometryczne
ID BaDAP | 117202 |
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Data dodania do BaDAP | 2018-10-17 |
Tekst źródłowy | URL |
DOI | 10.3390/min8040126 |
Rok publikacji | 2018 |
Typ publikacji | artykuł w czasopiśmie |
Otwarty dostęp | |
Creative Commons | |
Czasopismo/seria | Minerals |
Abstract
Tourmalines are a group of minerals which may concentrate various accessory components, e.g., Cu, Ni, Zn, Bi, Ti, and Sn. The paper presents fluor-elbaite and elbaite from a dyke of the Julianna pegmatitic system at Piława Górna, at the NE margin of the Bohemian Massif, SW Poland, containing up to 6.32 and 7.37 wt % ZnO, respectively. Such high amounts of ZnO are almost two times higher than in the second most Zn-enriched tourmaline known to date. The compositions of the Zn-rich tourmalines from Piława Górna, studied by electron micropropy and Raman spectroscopy, correspond to the formulae:X(Na0.733Ca0.013□0.254)Y Σ1 (Al1.033Li0.792 Zn0.755Fe2+0.326Mn0.094)Z Σ3 Al6(TSi6O18)(BO3)V 3 (OH)W 3 (F0.654OH0.344), andX(Na0.779Ca0.015□0.206)Σ1 Y(Al1.061Li0.869Zn0.880Fe2+0.098Mn0.094)Z Σ3 Al6(TSi6O18)(BO3)V 3 (OH)W 3 (OH0.837F0.163), respectively, with Zn as one of the main octahedral occupants. A comparison with other tourmalines and associated Zn-rich fluor-elbaite and elbaite from the pegmatite indicates that atypically high Zn-enrichment is not a result of Zn-Fe fractionation, but dissolution and reprecipitation induced by a late (Na,Li,B,F)-bearing fluid within the assemblage of gahnite spinel and primary schorl-type tourmaline. This strongly suggests Na-Li-B-F metasomatism of gahnite-bearing mineral assemblages as that is the only environment that can promote crystallization of a hypothetical Zn-dominant tourmaline. The compositions of the Zn-rich fluor-elbaite and elbaite suggest three possible end-members for such a hypothetical tourmaline species: NaZn3Al6(Si6O18)(BO3)3(OH)3(OH), □(Zn2Al)Al6(Si6O18)(BO3)3(OH)3(OH) and Na(Zn2Al)Al6(Si6O18)(BO3)3(OH)3O by analogy with other tourmalines with divalent Y occupants, such as schorl/foitite/oxy-schorl and dravite/magnesio-foitite/oxy-dravite. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.