Informace o publikaci

Turmalíny ze svorů svrateckého krystalinika

Autoři

BURIÁNEK David ČOPJAKOVÁ Renata

Rok publikování 2008
Druh Článek v odborném periodiku
Časopis / Zdroj Acta Mus. Moraviae, Sci. geol.
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Obor Geologie a mineralogie
Klíčová slova tourmaline; schorl-dravite; boron; metamorphism; mica schist; Svratka Crystalline Complex; Czech Republic
Popis Tourmaline is a typical accessory mineral for most of micaschists in the Svratka Crystalline Complex. Based on petrographic and chemical data, two main generations of tourmaline have been distinguished. The first generation (tourmaline cores) corresponds to the prograde metamorphic event characterised by mineral assemblage Ms+Bt+Tu+/-Ky+/-St. The second generation of tourmaline (tourmaline rims) formed during exhumation of the Svratka Crystalline Complex, simultaneously with decompression breakdown of staurolite. Microprobe analyses of tourmalines reveal a compositional variation between Al-rich schorldravite to dravite (XFe 0.22-0.61; Al 5.88-6.77 apfu; Na 0.45-0.91 apfu). Tourmaline rims are typically enriched in Fe, usually enriched in Al and depleted in Mg, Na, Si relative to tourmaline cores.

Používáte starou verzi internetového prohlížeče. Doporučujeme aktualizovat Váš prohlížeč na nejnovější verzi.

Další info