Schorl-oxy-schorl to dravite-oxy-dravite tourmaline from granitic pegmatites; examples from the Moldanubicum, Czech Republic

NOVÁK, Milan, Pavel POVONDRA and Julie Beryl SELWAY. Schorl-oxy-schorl to dravite-oxy-dravite tourmaline from granitic pegmatites; examples from the Moldanubicum, Czech Republic. European Journal of Mineralogy. 2004, vol. 16, No 2, p. 323-333. ISSN 0935-1221.

Basic information

• Original name: Schorl-oxy-schorl to dravite-oxy-dravite tourmaline from granitic pegmatites; examples from the Moldanubicum, Czech Republic
• Name in Czech: Skoryl-oxy-skoryl až dravit-oxy-dravit z granitických pegmatitů; příklady z moldanubika, Česká republika
• Authors: NOVÁK, Milan (203 Czech Republic, guarantor), Pavel POVONDRA (203 Czech Republic) and Julie Beryl SELWAY (124 Canada).
• Edition: European Journal of Mineralogy, 2004, 0935-1221.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10500 1.5. Earth and related environmental sciences
• Country of publisher: Germany
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 1.207
• RIV identification code: RIV/00216224:14310/04:00010654
• Organization unit: Faculty of Science
• UT WoS: 000220576500014
• Keywords in English: Schorl-oxy-schorl to dravite-oxy-dravite tourmaline from granitic pegmatites; examples from the Moldanubicum; Czech Republic
• Tags: Czech Republic, examples from the Moldanubicum

Abstract

Wet-chemical analyses (41) of tourmaline from granitic pegmatites (barren, barren-pocket, beryl, lepidolite types) in the Moldanubicum, Czech Republic revealed that members of the oxy-subgroup ĄV common oxy-schorl, minor oxy-dravite and rare oxy-foitite are more abundant relative to the relevant members of the hydroxy-subgroup. The primary substitution mechanisms in tourmaline show combination of heterovalent substitutions: YAlWO YR2+-1W(OH)-1, XďYAl2WO XNa-1YR2+-2W(OH)-1, XďYAl XNa-1YR2+-1 and Xď W(OH) XNa-1WO-1, and homovalent substitutions: Fe2+Mg-1 and (OH)F-1. Tourmalines with the chemistry expressed by the general formula X(Na0.5ď0.5)Y(R2+2Al)ZAl6(BO3)3Si6O18V(OH)3W(O0.5OH0.5) crystallized in very similar PT conditions in granitic systems saturated on Na, Al, Si and H2O, it indicates the importance of short-range order requirements on tourmaline chemical composition. Abundance of heterovalent substitutions involving the W-site requires determination of light elements (H, B, F, Li) and Fe2+/Fe3+ in tourmalines to specify substitution mechanisms with certainty. Normalization of electron-microprobe data of (Fe,Mg)-rich, (Ca,Li,F)-poor tourmalines from granitic pegmatites on (OH,F)3.5O0.5, which is more probable than (OH,F)4, seems to be suitable.

Abstract (in Czech)

Skoryl-oxy-skoryl až dravit-oxy-dravit z granitických pegmatitů; příklady z moldanubika, Česká republika - zjištěny velmi specikická složení turmalínů, čstý vstup O do pozice W

Links

• GA205/03/0040, research and development project: Name: Parciální tavení hornin v kořenové zóně variského orogénu (moldanubikum, Český masív)

Investor: Czech Science Foundation, Partial melting of rocks in the root zone of the Variscan orogenic belt (Moldanubian Zone, Bohemian Massif)

• GA205/99/0434, research and development project: Name: Turmalín, dumortierit a jejich minerální asociace jako indikátor procesů tavení v bórem bohatých peraluminických horninách moldanubika

Investor: Czech Science Foundation, Tourmaline, dumortierite and their mineral assemblages as records of the melting process in B-rich peraluminous rocks from the Moldanubian zone

• MSM 143100004, plan (intention): Name: Geologické procesy a jejich environmentální vyústění - styk variscid a alpid

Investor: Ministry of Education, Youth and Sports of the CR, Geological Processes and their Environmental Impact - Contact of the Variscides and Alpides