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Alkaline and ultramafic carbonate lamprophyres in Central Bohemian carboniferous basins, Czech Republic

Alkalische und ultramafische Karbonat-Lamprophyre der zentralen böhmischen Karbonbecken, Tschische Republik

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Summary

Dykes of alkaline and ultramafic carbonate lamprophyres (monchiquite-ouachitite and aillikite) intrude the Carboniferous sediments of Central Bohemia. Their characteristic feature is the presence of substantial amounts of a sodalite group mineral (presumably haüyne), carbonate and barite. Isotopic compositions ofδ 13C (−3.4 to −6.2‰) andδ 18O ( + 13.5 to + 15.9‰) indicate that the carbonate is of primary magmatic origin and that fluids were formed at temperatures of 500 to 350°C. High contents of CO2 (3.6 to 17.6 wt.%) and incompatible elements, high LREE/HREE ratios (30.0 to 57.7), and low Rb/Sr (0.025 to 0.078) and87Sr/86Sr (0.7038 to 0.7042) ratios suggest the ultramafic lamprophyres are related to deep-seated carbonated magmas of mantle origin. Low degree of partial melting ( < 1%) of the mantle peridotite is envisaged, with additional transport of fluids rich in incompatible elements into the crustal chamber. Alkaline lamprophyres are fractionated derivatives which originated from the same source. Magma intrusion from different levels of a magma chamber into fracture zones under horizontal tension without a central intrusion could result in variability in lamprophyre composition (cumulates or evolved derivatives).

Zusammenfassung

Alkalische und ultramafische Karbonat-Lamprophyrgänge (Monchiquit-Ouachitit und Aillikit) intrudieren in karbonische Sedimente Zentralböhmens. Sie sind charakterisiert durch das Auftreten von beträchtlichen Mengen an Mineralen der Sodalith-Gruppe (v.a. Haüyn), Karbonaten und Baryt. Ihre Isotopenzusammensetzung von⊙ 13C (−3.4 bis −6.2‰) undδ 18O (13.5 bis 15.9‰) zeigt, daß die Karbonate primär magmatischen Ursprungs sind und daß assoziierte Fluide in einem Temperaturbereich von 350 bis 500°C gebildet wurden. Hohe Gehalte an CO2 (3.6 bis 17.6 Gew. %), inkompatiblen Elementen, hohe LREE/HREE-Verhältnisse (30.0 bis 57.7), sowie niedrige Rb/Sr—(0.025 bis 0.078) und87Sr/86Sr-(0.7038 bis 0.7042) Verhältnisse lassen vermuten, daß die ultramafischen Lamprophyre mit karbonatischen Magmen des Mantels in Beziehung stehen. Eine niedrige Aufschmelzungsrate ( < 1%) von Mantelperidotit mit zusätzlichem Transport von, an inkompatiblen Elementen angereicherten Fluiden, in die krustale Magmenkammer wird diskutiert. Alkalische Lamprophyre sind als stärker fraktionierte Magmen, die derselben Quelle entstammen, zu verstehen. Die Intrusion der aus verschiedenen Bereichen der Magmenkammer stammenden Magmen in durch horizontale Dehnung verursachte Störungszonen könnte das Fehlen eines zentralen Intrusionskörpers und die unterschiedliche Zusammensetzung der Lamprophyre (Kumulate oder entwickelte Derivate) erklären.

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Authors and Affiliations

  1. Department of Mineralogy, Geochemistry and Crystallography, Charles University, Albertov 6, 128 43, Praha 2, Czech Republic

    J. Ulrych

  2. Czech Academy of Sciences, Geological Institute, Rozvojová 135, 165 00, Praha 6, Czech Republic

    E. Pivec

  3. Geological Survey, Malostranské náměstí 19, 118 21, Praha 2, Czech Republic

    K. Zák &  J. Bendl

  4. GMS a.s. Prístavní 24 6, 170 04, Praha 7, Czech Republic

    P. Bosák

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Ulrych, J., Pivec, E., Zák, K. et al. Alkaline and ultramafic carbonate lamprophyres in Central Bohemian carboniferous basins, Czech Republic. Mineralogy and Petrology 48, 65–81 (1993). https://doi.org/10.1007/BF01164909

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