Hydrothermal replacement of garnet by tourmaline - an example from LCT pegmatites in Sahatany Valley, Madagascar
Identifikátory výsledku
Kód výsledku v 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>
Výsledek na webu
<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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Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Hydrothermal replacement of garnet by tourmaline - an example from LCT pegmatites in Sahatany Valley, Madagascar
Popis výsledku v původním jazyce
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 +
Název v anglickém jazyce
Hydrothermal replacement of garnet by tourmaline - an example from LCT pegmatites in Sahatany Valley, Madagascar
Popis výsledku anglicky
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 +
Klasifikace
Druh
O - Ostatní výsledky
CEP obor
DB - Geologie a mineralogie
OECD FORD obor
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Návaznosti výsledku
Projekt
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Návaznosti
S - Specificky vyzkum na vysokych skolach
Ostatní
Rok uplatnění
2014
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů