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Crystallization conditions of oxy-dravite and magnesio-lucchesiite tourmaline in amphibolite-hosted quartz veins at Budniki, SW Poland
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DOI：10.1016/j.lithos.2026.108689.png)
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Abstract
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• Examined tourmalines have a metamorphic origin and were formed during Variscan regional metamorphism and contact metamorphism from the Karkonosze granite intrusion. • The main factors of evolution tourmaline-supergroup to Ca members are decreasing pressure and presence of Ca and F-enriched fluids. • The shift in Boron isotopic composition is related to B released from the internal part of primary tourmaline by leaching and mixed with an external source, enriched in 10B. • Ca-group tourmalines are sensitive indicators of low-pressure, medium-to-high-temperature metamorphic processes.
Keywords:
Tourmaline
Oxy-dravite
Magnesio-lucchesiite
Boron-isotopes
Moldanubian
Karkonosze-Izera Massif
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