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

Ewa Krzemińska; Ian Williams; Janina Wiszniewska

doi:10.1111/j.1365-3121.2005.00631.x

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 journal › Article › peer-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 language	English
Pages (from-to)	442-449
Number of pages	8
Journal	Terra Nova
Volume	17
Issue number	5
DOIs	https://doi.org/10.1111/j.1365-3121.2005.00631.x
Publication status	Published - Oct 2005

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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.",

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N2 - 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.

AB - 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.

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

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