Detailed Information on Publication Record
2012
COMPOSITIONAL EVOLUTION OF ZONED TOURMALINE CRYSTALS FROM POCKETS IN COMMON PEGMATITES OF THE MOLDANUBIAN ZONE, CZECH REPUBLIC
GADAS, Petr, Milan NOVÁK, Josef STANĚK, Jan FILIP, Michaela VAŠINOVÁ GALIOVÁ et. al.Basic information
Original name
COMPOSITIONAL EVOLUTION OF ZONED TOURMALINE CRYSTALS FROM POCKETS IN COMMON PEGMATITES OF THE MOLDANUBIAN ZONE, CZECH REPUBLIC
Name in Czech
Vývoj chemického složení zonálních krystalů turmalínu z dutin v obyčejných pegmatitech Moldanubika, Česká Republika
Authors
GADAS, Petr (203 Czech Republic, belonging to the institution), Milan NOVÁK (203 Czech Republic, guarantor, belonging to the institution), Josef STANĚK (203 Czech Republic), Jan FILIP (203 Czech Republic) and Michaela VAŠINOVÁ GALIOVÁ (203 Czech Republic, belonging to the institution)
Edition
Canadian Mineralogist, Ottawa, MAC, 2012, 0008-4476
Other information
Language
English
Type of outcome
Článek v odborném periodiku
Field of Study
10500 1.5. Earth and related environmental sciences
Country of publisher
Canada
Confidentiality degree
není předmětem státního či obchodního tajemství
Impact factor
Impact factor: 1.180
RIV identification code
RIV/00216224:14310/12:00058609
Organization unit
Faculty of Science
UT WoS
000314174400010
Keywords (in Czech)
foitit; skoryl; dravit; magensio-foitit; vývoj chemického složení; běžný pegmatit; Moldanubikum; Česká Republika
Keywords in English
foitite; schorl; dravite; magnesio-foitite; compositional evolution; zoning; pocket; common pegmatite; Moldanubian Zone; Czech Republic
Tags
Reviewed
Změněno: 9/4/2013 15:45, Ing. Andrea Mikešková
Abstract
V originále
Common pegmatites commonly occur in migmatized biotite-sillimanite gneisses and felsic granulites of the Strazek Unit, Moldanubian Zone, in the Czech Republic. Mostly concordant dikes or irregular bodies consisting of an outer granitic unit, a graphic unit and a pocket unit with large crystals (up to 1 m long) of minerals show transitional to locally sharp contacts to the host migmatized rocks. Thin muscovite-rich veins with the assemblage muscovite, albite, quartz and tourmaline are closely associated spatially. Variable prismatic to lens-shaped tourmaline crystals and their aggregates, up to 30 cm across, from pockets and muscovite-rich veins exhibit striking zoning in the optical microscope and in BSE images: core (foitite-schorl-magnesio-foitite), intermediate zone (schorl-dravite) and narrow outer rim (schorl-dravite); tourmaline from muscovite veins is relatively homogeneous (dravite-magnesio-foitite). A slight decrease in X-site vacancy, in Fe-tot/(Fe-tot + Mg) and Al contents but sharp increase of Ti from the core to intermediate zone and outer rim, respectively, are typical. Nearly all Fe was determined as Fe2+ (3% of Fe3+ in both core and intermediate zones of the tourmaline) using Mossbauer spectroscopy. The mineral assemblages (andalusite + cordierite) of common pegmatites and their geological and petrographic features indicate P-T conditions of similar to 500-650 degrees C and less than similar to 3-4 kbar for massive units, but lower for tourmalines and other minerals from pockets and in particular for associated muscovite-rich veins. The distribution of pegmatites in migmatitic rocks, their concordant and transitional (diffusive) contacts to the country rocks, simple assemblages of minerals, primitive chemical composition of minerals (all typical for abyssal pegmatites), and common large pockets lined with well-developed crystals of smoky quartz, feldspars, muscovite, and tourmalinedo not fit the current classifications of granitic pegmatites.
Links
| GAP210/10/0743, research and development project |
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| MSM0021622412, plan (intention) |
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