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Petrogenesis of contrasting granitoid plutons in western Bohemia (Czech Republic)

Petrogenese kontrastierender Granitplutone in Westböhmen (Tschechien)

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Summary

Late-Variscan granitoid plutons in western Bohemia (Bor, Waidhaus-Rozvadov) have distinct petrographic, geochemical and isotopic features that suggest different magmatic evolutions. The Bor pluton comprises a suite of metaluminous tonalites and quartz diorites (Bor I), weakly peraluminous (monzo-)granites and granodiorites (Bor II) and medium-aluminous, late vein-forming leucomonzogranites (Bor III). The Waidhaus-Rozvadov pluton is strongly peraluminous, comprising a cordierite-biotite granitoid (CBG), the Rozvadov granite (ROG), the Bärnau granite (BÄG) and the subordinate, highly evolved Kreuzstein (Křížový kámen) granite (KG). Geochemical parameters and initial87Sr/86Sr ratios straddle the boundary between I- and S-type granites in the Bor pluton and are characteristic of purely S-type granites in the Waidhaus-Rozvadov pluton.

The Bor II granitoids have been dated by the Rb-Sr whole-rock method at 341±17 Ma (ISr = 0.70724±0.00060). K-Ar biotite and muscovite ages of all units of the Bor pluton are mainly in the range 321-315 Ma. The K-Ar mineral ages are in good agreement with recently published U-Pb zircon data of these rocks. The different units of the Waidhaus-Rozvadov pluton have yielded less well-constrained Rb-Sr whole-rock ages, ranging from 313 to 300 Ma. However, the intrusion sequence is constrained by K-Ar muscovite ages (312-302 Ma), which define a systematic decrease towards the chemically more evolved granite types. Taken as a whole, it seems likely that the new radiometric ages characterize two temporally distinct periods of late-Variscan granitoid intrusion. The regional significance of these periods is emphasized by contemporaneous ages previously found in the adjacent northeastern Bavarian granitoids.

The initial Sr and Nd isotope systematics indicate that the Bor and the WaidhausRozvadov plutons were derived from different source rocks. The Bor granitoids reflect the influence of less evolved crustal material which may have been similar to paragneisses of the Teplá-Barrandian region, including the Zone of ErbendorfVohenstrauß (ZEV). The Waidhaus-Rozvadov granitoids probably resulted from anatexis of rocks resembling surrounding Moldanubian paragneisses or metapelites. In addition, the two plutons exhibit poorly defined, opposite trends of εNd(T) variation which are ascribed to assimilation processes.

Zusammenfassung

Spätvariscische Granitplutone in Westböhmen (Bor, Waidhaus-Rozvadov) weisen petrographische, geochemische und isotopische Kontraste auf, die unterschiedliche magmatische Entwicklungen nahelegen. Der Bor Pluton umfaßt metalumine Tonalite und Quarzdiorite (Bor I), schwach peralumine (Monzo-)granite und Granodiorite (Bor II) und mäßig alumine, gangbildende Leukomonzogranite (Bor III). Der WaidhausRozvadov Pluton besitzt stark peralumine Zusammensetzung und läßt sich in einen Cordierit-Biotit Granitoid (CBG), den Rozvadov Granit (ROG), den Bärnau Granit (BÄG) und den stofflich hochentwickelten Kreuzstein (Křížový kámen) Granit (KG) untergliedern. Geochemische Parameter und initiale87Sr/86Sr-Verhältnisse liegen im Falle des Bor Plutons im Übergangsbereich zwischen I- und S-Typ Graniten und im Falle des Waidhaus-Rozvadov Plutons im Bereich reiner S-Typ Granite.

Die Bor II Granitoide wurden nach der Rb-Sr Gesamtgesteinsmethode auf 341±17 Ma (ISr = 0.70724±0.00060) datiert. K-Ar Biotit- und Muskovitalter der Bor Granitoide liegen zwischen 321 and 315 Ma. Die K-Ar Mineralalter stehen im Einklang mit den kürzlich publizierten U-Pb Zirkondaten dieser Gesteine. Die verschiedenen Teilintrusionen des Waidhaus-Rozvadov Plutons liefern weniger gut definierte Rb-Sr Gesamtgesteinsalter zwischen 313 and 300 Ma. Die Intrusionsabfolge läßt sich dennoch durch K-Ar Muskovitalter festlegen (312-302 Ma), die eine systematische Abnahme von den weniger zu den starker entwickelten Granittypen aufweisen. Als Ganzes betrachtet dokumentieren die neuen radiometrischen Daten zwei zeitlich voneinander getrennte spdtvariscische Intrusionsereignisse. Die regionale Signifikanz dieser Ereignisse wird durch eine analoge Altersverteilung in den benachbarten nordostbayerischen Granitoiden untermauert.

Anhand der initialen Sr und Nd Isotopensystematik können für die Bor und Waidhaus-Rozvadov Plutone unterschiedliche Quellen abgeleitet werden. Die Bor Granitoide spiegeln den Einfluß von gering entwickelten krustalen Material wider, das ähnliche stoffliche Eigenschaften besaß, wie Paragneise des Teplá-Barrandiums und der Zone von Erbendorf-Vohenstrauss (ZEV). Die Waidhaus-Rozvadov Granitoide lassen sich als Derivate moldanubischer Paragneise and Metapelite oder vergleichbarer Gesteine auffassen. Die zwei Plutone weisen schwach ausgeprägte gegensätzliche εNd(T)-Variationen auf, was auf unterschiedliche Assimilationsprozesse zurückgeführt wird.

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Authors and Affiliations

  1. GeoForschungsZentrum, Telegrafenberg B 123, D-14473, Potsdam, Germany

    W. Siebel & I. Wendt

  2. Czech Geological Survey, Geologická 6, CZ-152 00, Prague 5, Czech Republic

    K. Breiter

  3. Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655, Hannover, Germany

    A. Höhndorf & F. Henjes-Kunst

  4. Institute of Rock Structure and Mechanics, Academy of Sciences, V Holešovickách 41, CZ-182 09, Prague 8, Czech Republic

    M. René

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Siebel, W., Breiter, K., Wendt, I. et al. Petrogenesis of contrasting granitoid plutons in western Bohemia (Czech Republic). Mineralogy and Petrology 65, 207–235 (1999). https://doi.org/10.1007/BF01161961

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