Journal of Petrology Advance Access published online on January 4, 2006
Journal of Petrology, doi:10.1093/petrology/egi091
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1 DIVISION OF MINERALOGY & MATERIAL SCIENCE, UNIVERSITY OF SALZBURG, HELLBRUNNERSTRASSE 34, A-5020 SALZBURG, AUSTRIA; CZECH GEOLOGICAL SURVEY, KLÁROV 3/131, 118 21 PRAGUE 1, CZECH REPUBLIC
* To whom correspondence should be addressed. The Li
Received December 20, 2004
Accepted November 11, 2005
Article
Low-pressure Granulites of the Li
VOJT
ov Massif, Southern Bohemia: Viséan Metamorphism of Late Devonian Plutonic Arc Rocks
CH JANOU
EK 1 *,
AXEL GERDES 2,
STANISLAV VRÁNA 3,
FRITZ FINGER 4,
VOJTCH ERBAN 3,
GERTRUDE FRIEDL 5,
and
COLIN J. R. BRAITHWAITE 6
2 INSTITUTE OF MINERALOGY, J. W. GOETHE-UNIVERSITY, SENCKENBERGANLAGE 28, D-60054 FRANKFURT, GERMANY
3 CZECH GEOLOGICAL SURVEY, KLÁROV 3/131, 118 21 PRAGUE 1, CZECH REPUBLIC
4 DIVISION OF MINERALOGY & MATERIAL SCIENCE, UNIVERSITY OF SALZBURG, HELLBRUNNERSTRASSE 34, A-5020 SALZBURG, AUSTRIA
5 DIVISION OF GENERAL GEOLOGY & GEODYNAMICS, UNIVERSITY OF SALZBURG, HELLBRUNNERSTRASSE 34, A-5020 SALZBURG, AUSTRIA
6 DIVISION OF EARTH SCIENCES, UNIVERSITY OF GLASGOW, GLASGOW G12 8QQ, UK
VOJTCH JANOUEK, E-mail: janousek{at}cgu.cz
Abstract 
ov Granulite Massif differs from neighbouring granulite bodies in the Moldanubian Zone of southern Bohemia (Czech Republic) in including a higher proportion of intermediate-mafic and orthopyroxene-bearing rocks, associated with spinel peridotites but lacking eclogites. In addition to dominantly felsic garnet granulites, other major rock types include quartz dioritic two-pyroxene granulites, tonalitic granulites and charnockites. Minor bodies of high-pressure layered gabbroic garnet granulites and spinel peridotites represent tectonically incorporated foreign elements. The protoliths of the mafic-intermediate granulites (quartz-dioritic and tonalitic) crystallized 
360-370 Ma ago, as indicated by laser ablation inductively coupled plasma mass spectrometry U-Pb ages of abundant zircons with well-preserved magmatic zoning. Strongly metamorphically recrystallized zircons give ages of 330-340 Ma, similar to those of other Moldanubian granulites. For the overwhelming majority of the Liov granulites peak metamorphic conditions probably did not exceed 800-900°C at 4-5 kbar; the equilibration temperature of the pyroxene granulites was 670-770°C. This is in sharp contrast to conditions of adjacent contemporaneous Moldanubian granulites, which are characterized by a distinct HP-HT signature. The mafic-intermediate Liov granulites are thought to have originated during Viséan metamorphic overprinting of metaluminous, medium-K calc-alkaline plutonic rocks that formed the mid-crustal root of a Late Devonian magmatic arc. The protolith resembled contemporaneous calc-alkaline intrusions in the European Variscan Belt.
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