A Late Paleoproterozoic (1.80 Ga) subduction-related mafic igneous suite from Lomza, NE Poland

Ewa Krzemińska*, Ian Williams, Janina Wiszniewska

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    21 Citations (Scopus)

    Abstract

    The Lomza orthoamphibolites in the crystalline basement of NE Poland, dated at 1802 ± 9 Ma by SHRIMP zircon U-Pb, are characterized by high incompatible and REE element contents. These features, the low Nb, and the position of the rock compositions on La-Y-Nb, Zr-Nb/Zr and Zr-Nb-Y tectonomagmatic discrimination diagrams, suggest that the metavolcanics formed in a subduction setting, possibly within a continental margin island arc. The likely extension of the belt of Paleoproterozoic mafic magmatism from Latvia and Lithuania into NE Poland provides convincing evidence for the existence of an active plate margin in that region at that time.

    Original languageEnglish
    Pages (from-to)442-449
    Number of pages8
    JournalTerra Nova
    Volume17
    Issue number5
    DOIs
    Publication statusPublished - Oct 2005

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