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Mineralogical Magazine; April 2000; v. 64; no. 2; p. 347-358
© 2000 Mineralogical Society of Great Britain and Ireland
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Chemical zoning of muscovite from the Ervedosa granite, northern Portugal

M. E. P. Gomes1,* and A. M. R. Neiva2

1 Department of Geology, University of Trás-os-Montes and Alto Douro, 5000 Vila Real, Portugal
2 Department of Earth Sciences, University of Coimbra, 3000 Coimbra, Portugal

* E-mail: mgomes{at}utad.pt

The tin-bearing muscovite granite from Ervedosa contains unzoned primary muscovite. This Hercynian S-type granite was hydrothermally altered at the stanniferous quartz vein walls and contains three types of muscovite: (1) very small unzoned muscovite replacing albite; (2) small unzoned hydrothermal muscovite replacing K-feldspar and quartz; and (3) zoned subhedral muscovite.

In the zoned muscovite, the core has a composition similar to that of magmatic muscovite from the unaltered granite, while the rim has a composition similar to that of hydrothermal muscovite replacing K-feldspar and quartz in the altered granite. The rim corresponds to a late overgrowth richer in the celadonitic component than the core. Infiltrated mineralizing fluids reacted with biotite and K-feldspar of the unaltered granite. We interpret the rim of muscovite to have precipitated from these solutions.

KEYWORDS: chemically zoned muscovite, magmatic muscovite, hydrothermal muscovite, S-type granite




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