Zirconium silicates in a peralkaline granite:a record of the interplay of magmatic and hydrothermal processes (Ilímaussaq complex, Greenland)

Cegiełka, M. and Bagiński, B. and Macdonald, R. and Belkin, H.E. and Kotowski, J. and Upton, B.G.J. (2022) Zirconium silicates in a peralkaline granite:a record of the interplay of magmatic and hydrothermal processes (Ilímaussaq complex, Greenland). Acta Geologica Polonica, 72 (2). pp. 235-245.

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Abstract

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-Sibearing 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.

Item Type:
Journal Article
Journal or Publication Title:
Acta Geologica Polonica
ID Code:
173203
Deposited By:
Deposited On:
19 Jul 2022 10:55
Refereed?:
Yes
Published?:
Published
Last Modified:
06 Aug 2022 00:07