Szczegóły publikacji
Opis bibliograficzny
Beusite and an unusual Mn-rich apatite from the Szklary granitic pegmatite, Lower Silesia, southwestern Poland / Adam PIECZKA // The Canadian Mineralogist ; ISSN 0008-4476. — 2007 — vol. 45 pt. 4, s. 901–914. — Bibliogr. s. 913–914, Abstr., Sommaire
Autor
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 57277 |
|---|---|
| Data dodania do BaDAP | 2011-02-19 |
| Tekst źródłowy | URL |
| DOI | 10.2113/gscanmin.45.4.901 |
| Rok publikacji | 2007 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Canadian Mineralogist |
Abstract
An assemblage of phosphate minerals, including beusite, Mn-rich fluorapatite, chlorapatite, hydroxylapatite and traces of alluaudite and mitridatite, usually accompanied by Mn-rich oxides also enriched in Ba, Ca, Mg and Ni, and Bi and Ph, has been recognized in a granitic pegmatite occurring within serpentinites of the Szklary massif in Lower Silesia, Poland. This pegmatite is a representative of the MSREL-REE subclass of the muscovite - rare-element pegmatites. The beusite usually occurs there as a Mn-dominant, (Ca,Fe)-bearing, Mg-enriched phase devoid of the typical lamellar intergrowths with triphylite or sarcopside, evolving toward more and more Mn-enriched varieties, stabilized by the earlier crystallization of tourmaline and fluorapatite. In terms of enrichment in Mn, the beusite from Szklary is on a level with that from the Cross Lake pegmatite in Canada, considered as the example richest in Mn worldwide. Similarly, Mn-rich fluorapatite containing up to 19.3 wt.% MnO, and a Mn-dominant apatite-group mineral containing up to 31.5 wt.% MnO, are two apatite species richest in Mn worldwide, the. second close to the ideal Mn3Ca2(PO4)(3)(Cl,F,OH) composition. The progressive removal of Fe over Mn, a decrease in the activities of F and Fe due to crystallization of abundant Fe-bearing tourmaline and fluorapatite, extraction of Mn from pegmatite-forming, H2O-undersaturated, Cl-enriched melts by an exsolved H2O-, F- and Cl-bearing volatile phase, and metasomatic alteration induced by residual Mn- and Cl-bearing fluids additionally enriched in Mn released during the dissolution of metastable beusite are the main reasons of such a high degree of Mn enrichment in the phosphates from the Szklary pegmatite.