Project information
Partial melting of rocks in the root zone of the Variscan orogenic belt (Moldanubian Zone, Bohemian Massif)
- Project Identification
- GA205/03/0040
- Project Period
- 1/2003 - 1/2005
- Investor / Pogramme / Project type
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Czech Science Foundation
- Standard Projects
- MU Faculty or unit
- Faculty of Science
- Keywords
- Partial Melting, Moldanubian Zone, Petrology, Geochemistry, Sr-Nd Isotopic System
Peraluminous granitic rocks formed by partial melting of metasedimentary lithologies are abundant in root zones of the orogenic belts worldwide. The proposed project aims to constrain the partial melting process with variable protoliths, degree of melting, P-T conditions and in distinct structural position within the Moldanubian Zone of the Bohemian Massif. Various stages of the process will be studied, starting from the presumed protoliths, through migmatites and diatexites, to likely restites and small leucocratic bodies. The main questions addressed will be potential sources for individual rock types, role of water and other volatiles (water saturated/undersaturated melts), mode of melting (equilibrium/disequilibrium melting), role of accessory phases, quantitative aspects (the restitic assemblage, the degree of partial melting, mass balance restite/melt) and timing. These goals should be achieved by a complex study of field relations, petrology, mineral chemistry, geothermobarometry, whole-rock major- and trace-element geochemistry, Sr–Nd–O isotopic compositions, geochronology as well as extensive numerical modelling. The obtained data will contribute to our current understanding of petrogenesis of broadly S-type granitic rocks. Inferred P-T-t evolution of the system (isobaric cooling vs. isothermal decompression) should be indicative of the tectonometamorphic evolution of the individual Moldanubian nappes (presence of external heat sources e.g. mafic intrusions vs. crustal thickening).
Publications
Total number of publications: 29
2003
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Horní Bory. Structural and metamorphic evolution of the high-T/high-P Gföhl unit (Moldanubicum).
Geology without frontiers: magmatic and metamorphic evolution of Central European Variscides. Excursion Guide., year: 2003
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Chemical composition of tourmaline from granitic rocks; geochemical versus crystal-structural constraints
Mitteilungen der Osterreichischen Mineralogischen Gesellschaft, year: 2003, volume: 148, edition: 1
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International symposium on Light Elements in Rock-forming minerals-LERM
Year: 2003, type: Conference
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Lavičky near Velké Meziříčí, Nodular tourmaline granite, barren pegmatite, quartz vein. Minerals of interest: schorl, fluor-schorl, oxy-dravite, fluor-dravite (F,OH,O, B isotops).
Field Trip Guidebook, International Symposium LERM 2003, year: 2003
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Nedvědice II. Muscovite-tourmaline orthogneiss, tourmaline-fluorite layer. Minerals of interest: muscovite (F,OH, Li), annite (F,OH), fluor-schorl, fluor-dravite (F,OH,O,Li,B)
Field Trip Guidebook, International Symposium LERM 2003, year: 2003
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Rapid exhumation and cooling of the thickened crust: evidence from the granulite clasts within the Upper Visean Conglomerates (Rhenohercynikum).
Geology without frontiers: magmatic and metamorphic evolution of Central European Variscides. Excursion Guide., year: 2003
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The Letovice-Rehberg ophiolite - a remnant of an ocean between Brunovistulicum and Moldanubicum
Geology without frontiers:Magmatic and Metamorphic evolution of central European Variscides, year: 2003
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Tourmaline from the NYF pegmatites; example from the Třebíč Massif
LERM 2003, International Symposium on Light Elements in Rock-forming Minerals, year: 2003
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Tourmaline-bearing versus axinite-bearing veins within metabasite zone, Brno batholith, Czech Republic.
Book of Abstracts, International Symposium LERM 2003, year: 2003