Modelling Diverse Processes in the Petrogenesis of a Composite Batholith: the Central Bohemian Pluton, Central European Hercynides
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. P...
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| Veröffentlicht in: | Journal of petrology 2000-04, Vol.41 (4), p.511-543 |
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| container_title | Journal of petrology |
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| creator | JANOUŠEK, VOJTĚCH BOWES, D. R. ROGERS, GRAEME FARROW, COLIN M. JELÍNEK, EMIL |
| description | 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 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 |
| doi_str_mv | 10.1093/petrology/41.4.511 |
| format | Article |
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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 the 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. 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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 the 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. 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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 the 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. 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| title | Modelling Diverse Processes in the Petrogenesis of a Composite Batholith: the Central Bohemian Pluton, Central European Hercynides |
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