- Tytuł:
- Zirconium silicates in a peralkaline granite: a record of the interplay of magmatic and hydrothermal processes (Ilímaussaq complex, Greenland)
- Autorzy:
-
Cegiełka, Małgorzata
Bagiński, Bogusław
Macdonald, Ray
Belkin, Harvey E.
Kotowski, Jakub
Upton, Brian G. J. - Powiązania:
- https://bibliotekanauki.pl/articles/2086665.pdf
- Data publikacji:
- 2022
- Wydawca:
- Polska Akademia Nauk. Czytelnia Czasopism PAN
- Tematy:
-
peralkaline granite
Ilímaussaq complex
zircon
catapleiite
Elpidite
hydrothermal fluids
granit peralkaliczny
kompleks Ilimaussaq
cyrkon
płyny hydrotermalne - Opis:
- Compositional and textural data are presented for zircon, secondary Zr-silicates, catapleiite and elpidite in a peralkaline granite from the Ilímaussaq complex, south Greenland. The zircon is essentially stoichiometric, with (Zr + Hf + Si) = 1.96–1.98 a.p.f.u. The secondary Zr-silicates show a wide range of Zr/Si atomic ratios (0.13–0.79). The catapleiite varies from close to stoichiometric to a Na-depleted type showing cation deficiency (5.2–5.8 a.p.f.u.). Elpidite shows similar variations (7.2–9.0 a.p.f.u.). Textural relationships between the Zr phases are interpreted to show that magmatic zircon interacted with hydrous fluids exsolved from the magma to form the secondary Zr-silicates. Formation of catapleiite was late-magmatic, in equilibrium with a Na-Si-bearing fluid. This was followed by the crystallization of elpidite, the fluid having a different Na/Si ratio. Both catapleiite and elpidite experienced Na-loss during late-stage hydrothermal alteration.
- Źródło:
-
Acta Geologica Polonica; 2022, 72, 2; 235--245
0001-5709 - Pojawia się w:
- Acta Geologica Polonica
- Dostawca treści:
- Biblioteka Nauki
Artykuł