Record details

    Revision of Scheumann's classification of melilitic lamprophyres and related melilitic rocks in light of new analytical data
    Ackerman, Lukáš
    Adamovič, Jiří
    Balogh, K.
    Krmíček, L.
    Ulrych, Jaromír
Publication type
    článek v odborném periodiku
Source title - serial
    Journal of Geosciences
    Roč. 59, č. 1
    s. 3-22
    Projekt: IAA300130902, GA AV ČR3cav_un_auth*0252838
    Rozsah: 20 s. : P
Subject category
    Bohemian Massif
    melilitic rocks
Abstract (in english)
   Dykes of the Late Cretaceous to Early Tertiary (80-61 Ma) melilitic rock series of the Osečná Complex and the Devil's Walls dyke swarm, including ultramafic lamprophyres - polzenites - of Scheumann (1913) occur dispersed in entire Upper Ploučnice River basin in northern Bohemia. Polzenites and associated melilitic rocks are characterized by the mineral association of olivine + melilite ? nepheline, haüyne, monticellite, phlogopite, calcite, perovskite, spinels and apatite. New data on their mineral and chemical compositions from original Scheumann's localities (the Vesec, Modlibohov, Luhov types) argue against the abolition of the group of ultramafic lamprophyres and the terms 'polzenite' and 'alnöite' by the Le Maitre (2002) classification. Marginal facies and numerous flat apophyses of the lopolith-like body known as the Osečná Complex show an olivine micro-melilitolite composition (lamprophyric facies).
   The porphyritic texture, chemical composition and the presence of characteristic minerals such as monticellite and phlogopite point to their affinity with ultramafic lamprophyres - polzenites of the Vesec type. Melilite-bearing olivine nephelinites to olivine melilitites (olivine + clinopyroxene + nepheline + melilite ? haüyne and spinels with apatite) form a swarm of subparallel dykes known as the Devil's Walls. The Scheumann's non-melilite dyke rock "wesselite", spatially associated with polzenites and often erroneously attributed to the polzenite group, is an alkaline lamprophyre of monchiquite to camptonite composition (kaersutite + phlogopite + diopside + olivine phenocrysts in groundmass containing clinopyroxene, phlogopite, haüyne, analcime, titanian magnetite, apatite ? glass/plagioclase). First K-Ar data show Oligocene ages (31 to 28 Ma) (28 to 31 Ma) and an affinity to the common tephrite-basanite rock series.
    AV ČR Brno, Geologický ústav
Contributor code
    AV ČR, GLÚ
Source format
Import date
    23. 10. 2014