Summary
Subvolcanic pyroxenite-hornblendite-kentallenite-diorite-granodiorite masses of the appinite suite that are spatially and temporally associated with the much more voluminous granitic plutons of the British Caledonides have major element proportions and REE patterns indicative of shoshonitic affinities. Hornblendite-monzonite-syenogabbro-pyroxene melasyenite-durbachite-biotite-rich syenite-biotite-rich granite masses of the plutonic durbachite suite of the Bohemian Massif of the Central European Hercynides, that also are spatially and temporally associated with much more voluminous granitic plutons, have geochemical characteristics that generally correspond with those of the appinite suite. Compositionally both suites resemble lamprophyres emplaced during the latter parts of the respective episodes.
Both the appinite and durbachite suites show independence of K/Rb and SiO2 with the two suites having mainly different but somewhat overlapping K/Rb ratios. Other geochemical characters, as shown by fields and trends on K vs Rb, AFM and other plots, point to the durbachite suite representing generally more evolved products of shoshonitic magma than members of the appinite suite. However, there are different geochemical characteristics, including higher Cr/Ni ratios in the durbachite suite and Co present in lower proportions in the appinite suite. These differences are the result of different histories of freezing, remelting and partial separation and remixing of fractionation products and reflect the explosive subvolcanic vs plutonic regimes of the appinitic and durbachitic suites, respectively. Support for this petrogenesis is provided by mineral compositions and comparison of compositions of mineral phases and the rocks in which they occur.
Zusammenfassung
Subvulkanische Pyroxenit-Hornblendit-Kentallenit-Diorit-Granodioritmassen der Appinit-Gruppe, die räumlich und zeitlich mit den viel umfangreicheren Granitplutonen der Britischen Kaledoniden assoziiert sind, haben Hauptelementverteilungen und SEE Gehalte, die auf Beziehungen zu Shoshoniten hinweisen. Hornblendit-Monzonit-Syenogabbro-Pyroxen-Melasyenit-Durbachit-Biotit-reiche Syenite-Biotit-reiche Granitmassen der plutonischen Durbachitabfolge des Böhmischen Massivs der Mitteleuropäischen Herzyniden, die auch räumlich und zeitlich mit viel umfangreicheren Granitplutonen assoziiert sind, haben geochemische Charakteristika, die im allgemeinen mit denen der Appinit-Gruppe übereinstimmen. Beide Gruppen sind in ihrer Zusammensetzung Lamprophyren ähnlich, die in späteren Abschnitten der magmatischen Episoden Platz genommen haben.
Sowohl in den Appinit-, wie in den Durchbachit-Abfolgen sind K/Rb und SiO2 voneinander unabhängig, beide Gruppen haben aber verschiedene, wenn auch zum Teil einander überlappende K/Rb Verhältnisse. Andere geochemische Parameter, wie K vs Rb, AFM und andere, weisen darauf hin, daß die Durbachit-Abfolge im allgemeinen weiter entwickelte Produkte shoshonitischen Magmas darstellt, als die Mitglieder der Appinit-Gruppe. Es gibt jedoch verschiedene geochemische Charakteristika, wozu auch höhere Cr/Ni Verhältnisse in den Durbachiten und niedrige CoGehalte in den Appiniten gehōren. Diese Unterschiede sind das Ergebnis verschiedener Abkūhlung, Aufschmelzung und teilweiser Trennung- und Wiedermischung von Fraktionierungs-Produkten und weisen auf die explosiven subvulkanischen bzw. plutonischen Regimes der beiden Gruppen hin. Diese petrogenetische Interpretation wird durch Mineralzusammensetzungen und deren Vergleich mit den Muttergesteinen unterstützt.
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Bowes, D.R., Košler, J. Geochemical comparison of the subvolcanic appinite suite of the British Caledonides and the durbachite suite of the Central European Hercynides: evidence for associated shoshonitic and Granitic Magmatism. Mineralogy and Petrology 48, 47–63 (1993). https://doi.org/10.1007/BF01164908
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DOI: https://doi.org/10.1007/BF01164908