Hydrothermal replacement of garnet by tourmaline - an example from LCT pegmatites in Sahatany Valley, Madagascar

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F14%3A00075396" target="_blank" >RIV/00216224:14310/14:00075396 - isvavai.cz</a>
Result on the web
<a href="http://cemc2014.cz/abstracts-cemc2014.pdf" target="_blank" >http://cemc2014.cz/abstracts-cemc2014.pdf</a>
DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Hydrothermal replacement of garnet by tourmaline - an example from LCT pegmatites in Sahatany Valley, Madagascar
Original language description
In the pegmatites Tsarafara Nord and Tamponilapa, both tending to elbaite subtype, garnet and albite located close to Li-mineralized zone were partially replaced by a mixture of blue tourmaline and quartz. Spessartine-dominant garnets from the pegmatitesTsarafara Nord (Sps48-60Alm32-42Grs8-10) and Tamponilapa (Sps43-62Alm2244Grs3-21Prp0-3) are associated with primary tourmaline (schorl to Mg-rich schorl). Secondary tourmaline replacing garnet are of schorl to Fe-rich fluor-elbaite composition. Albite is close to the end member composition. The minerals from the Tsarafara Nord are slightly more fractionated with higher (Li, Mn, F) and less contaminated (elevated Ca, Mg, Ti) from host rock relative to the Tamponilapa. Textural relations showing replacement of garnet and albite by tourmaline and quartz suggest the simplified reaction: 24 NaAlSi3O8 + 3 (Mn1.6Fe1Ca0.4) Al2Si3O12 + 12 H3BO3 + 2 LiF => 4 (Na0.5Ca0.3v0.2) (Al1.5Fe0.75Li0.5Mn0.25) Al6 (Si6O18) (BO3)3 (OH3.5F0.5) + 46 SiO2 +
Czech name
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Czech description
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Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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