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- W2157140070 abstract "Tourmalinites from the Svratka Unit form stratiform layershosted in mica schists. The chemical composition of tourmalinefrom tourmalinites varies from Al-rich schorl to dravite. Thetourmaline usually exhibits three compositional domains, whichare, from centre to the rim: a chemically inhomogeneousbrecciated core (zone I), a volumetrically minor internal rimzone II, and a dominant outermost zone III. The compositionalvariability of tourmaline in all the zones is controlled by the(X YAl WOH) (XNa Y Mg WF)-1 and YFeYMg-1 substitutions. Thetourmaline of the zone I corresponds to highly vacanced X-site,Al-rich schorl with lower F (up to 0.43 apfu), which isinterpreted as an older, low-temperature hydrothermaltourmaline. Tourmaline of the zone II corresponds to draviterich in F (reaching up to 0.66 apfu) crystallizing during theprograde metamorphism. Lastly, the Al-rich schorl-dravite ofthe zone III, grew most likely during retrograde metamorphism.The tourmaline from the host mica schists has a similarchemical composition. The central dravite part corresponds tothe zone II, and the predominant schorl-dravite rim to the zoneIII, in tourmalines from tourmalinites. Overall, the draviteexhibits compositional characteristics of the prograde,amphibolite-facies metamorphic event characterised by themineral assemblage Qtz + Ms + Bt + Tu +/- Ky +/- St +/- Grt.The second generation of tourmaline (schorl-dravite), as wellas the rim of garnets present in both the mica-schists andtourmalinites, formed during exhumation of the Svratka Unitaccompanied by decreasing pressure and temperature. In the micaschists, this event resulted in decompression breakdown ofstaurolite, according to the reaction St + Ms + Qtz = Grt + Sil+ Bt + H2O. Breakdown of muscovite could have released B and Fused for tourmaline formation. The P-T conditions of thisretrograde metamorphism were calculated at 600-640 oC and 5-6kbar. Tourmalinites are interpreted as a part of ametamorphosed volcano-sedimentary complex primarily rich in Fand B, however, the derivation of all the F- and B-rich fluidsfrom the neighbouring migmatites and metagranites is unlikely.Similarities in the chemical composition of the tourmalinitesand the mica schists suggest a similar protolith to both rocktypes. The variation in most of the elements reflects themineral composition associated with the transition from micaschist to tourmalinite." @default.
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- W2157140070 date "2012-07-15" @default.
- W2157140070 modified "2023-09-24" @default.
- W2157140070 title "Tourmalinites in the metamorphic complex of the Svratka Unit (Bohemian Massif): a study of compositional growth of tourmaline and genetic relations" @default.
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- W2157140070 doi "https://doi.org/10.3190/jgeosci.048" @default.
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