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Journal of Petrology Volume 41 Number 4 Pages 511-543 2000
© Oxford University Press 2000

Modelling Diverse Processes in the Petrogenesis of a Composite Batholith: the Central Bohemian Pluton, Central European Hercynides

VOJTECH JANOUSEK1,2,*, D. R. BOWES1, GRAEME ROGERS2, COLIN M. FARROW1 and EMIL JELÍNEK3

1DIVISION OF EARTH SCIENCES, UNIVERSITY OF GLASGOW, GLASGOW G12 8QQ, UK
2ISOTOPE GEOSCIENCES UNIT, SCOTTISH UNIVERSITIES RESEARCH AND REACTOR CENTRE, EAST KILBRIDE, GLASGOW G75 0QF, UK
3DEPARTMENT OF GEOCHEMISTRY, CHARLES UNIVERSITY, ALBERTOV 6, 128 43 PRAGUE 2, CZECH REPUBLIC

The multiple intrusions making up the Central Bohemian Pluton in the Central European Hercynides have petrographic and geochemical features consistent with the presence of four main granitoid suites. Major-element, trace-element and Sr–Nd isotopic compositions are used to model their petrogenesis. Partial melting of metabasic rocks or of a CHUR-like mantle source are interpreted to have produced melts parental to the most primitive calc-alkaline Sázava suite. Interaction of basic with more acidic magmas followed by extensive amphibole–plagioclase-dominated fractionation accounts for the production of trondhjemites. Alternatively, the trondhjemites correspond to small-degree melts of a metabasic source. AFC (assimilation–fractional crystallization) modelling with a paragneiss as a contaminant and increasing DNd values simulates the characteristics of the Blatná suite. Closed-system fractionation of strongly enriched mantle-derived magmas or their interaction with leucogranitic melts is deduced for the petrogenesis of the shoshonitic Certovo bremeno suite. Partial melting of a metasedimentary source, followed by K-feldspar-dominated fractionation, accounts for the granites of the Rícany suite. The progression from relatively primitive calc-alkaline granitoids towards evolved, K-rich calc-alkaline and shoshonitic rocks is interpreted to reflect the increasing enriched mantle input in the petrogenesis of the later suites. The evidence for Hercynian subduction is equivocal and the mantle enrichment could have been significantly older.

KEY WORDS: batholith; granitoids; Hercynides; petrogenesis


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