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Zirconosilicate phase relations in the Strange Lake (Lac Brisson) Pluton, Quebec-Labrador, Canada by Stefano Salvi; Anthony E. Williams-Jones is a Earth and Planetary Sciences article available to read on EtoBox.

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Petrographic observations of subsolvus granites at Strange Lake indicate that the sodium zirconosilicate elpidite crystallized under magmatic conditions, but that the calcium zirconosilicates armstrongite and gittinsite are secondary. This interpretation is consistent with the extensive solid solution displayed by elpidite and the restricted compositions of armstrongite and gittinsite. Both calcium zirconosilicate minerals show textural evidence of having replaced elpidite, and in the case of gittinsite, with major volume loss. In the near-surface environment, gittinsite plus quartz fill the volume formerly occupied by elpidite. At greater depth, gittinsite and armstrongite partially replaced elpidite but are not accompanied by quartz, and abundant pore space is observed where gittinsite is the principal secondary phase. Below 70 m elpidite is generally unaltered. Replacement of elpidite by armstrongite is interpreted to have been a result of the cation-exchange reaction NazZrSi601s'3HzO + Ca2+ = CaZrSi601s.3HzO + 2Na+ elpidite armstrongite in which volume is nearly conserved, and replacement by gittinsite is thought to have resulted from the reaction NazZrSi601s.3HzO + Ca2+ + 5HzO

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Author

Stefano Salvi; Anthony E. Williams-Jones

Publisher

Mineralogical Society of America

Published

1995

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)