Modelling diverse processes in the petrogenesis of a composite batholith: the Central Bohemian Pluton, Central European Hercynides

Janousek, V., Bowes, D.R., Rogers, G., Farrow, C.M. and Jelinek, E. (2000) Modelling diverse processes in the petrogenesis of a composite batholith: the Central Bohemian Pluton, Central European Hercynides. Journal of Petrology, 41(4), pp. 511-543. (doi: 10.1093/petrology/41.4.511)

Abstract

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 locks or of a CHUR-like mantle source are interpreted to have produced melts parental to the most primitive calc-alkaline Sazava 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 D-Nd values simulates the characteristics of the Blatna 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 rite Ricany 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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Farrow, Dr Colin and Bowes, Professor Donald
• Authors: Janousek, V., Bowes, D.R., Rogers, G., Farrow, C.M., and Jelinek, E.
• Subjects: Q Science > QE Geology
• College/School: University Services > IT Services > Computing Service; College of Science and Engineering > Scottish Universities Environmental Research Centre
• Journal Name: Journal of Petrology
• ISSN: 0022-3530