Journal of Petrology Advance Access originally published online on January 4, 2006
Journal of Petrology 2006 47(4):705-744; doi:10.1093/petrology/egi091
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Low-pressure Granulites of the Li
ov Massif, Southern Bohemia: Viséan Metamorphism of Late Devonian Plutonic Arc Rocks
CH JANOU
EK1,2,*CH ERBAN2
1 DIVISION OF MINERALOGY & MATERIAL SCIENCE, UNIVERSITY OF SALZBURG, HELLBRUNNERSTRASSE 34, A-5020 SALZBURG, AUSTRIA
2 CZECH GEOLOGICAL SURVEY, KLÁROV 3/131, 118 21 PRAGUE 1, CZECH REPUBLIC
3 INSTITUTE OF MINERALOGY, J. W. GOETHE-UNIVERSITY, SENCKENBERGANLAGE 28, D-60054 FRANKFURT, GERMANY
4 DIVISION OF GENERAL GEOLOGY & GEODYNAMICS, UNIVERSITY OF SALZBURG, HELLBRUNNERSTRASSE 34, A-5020 SALZBURG, AUSTRIA
5 DIVISION OF EARTH SCIENCES, UNIVERSITY OF GLASGOW, GLASGOW G12 8QQ, UK
RECEIVED DECEMBER 20, 2004; ACCEPTED NOVEMBER 11, 2005
The Li
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.
KEY WORDS: low-pressure granulites; geothermobarometry; laser-ablation ICP-MS zircon dating; whole-rock geochemistry; Sr–Nd isotopes; Moldanubian Zone
* Corresponding author. Present address: Czech Geological Survey, Klárov 3/131, 118 21 Prague 1, Czech Republic. Telephone: +420 251085308. Fax: +420 251818748. E-mail: janousek{at}cgu.cz
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