Late Svecofennian sedimentary basins in the crystalline basement of NE Poland and adjacent area of Lithuania: Ages, major sources of detritus, and correlations

Ewa Krzemińska*, Janina Wiszniewska, Grazina Skridlaite, Ian S. Williams

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    The Precambrian basement of Lithuania and NE Poland, much of which is metasedimentary paragneiss, can be accessed only by cores from deep boreholes. Ion microprobe dating of detrital zircons from samples of these metasediments and the geochemical signatures of the rocks provide new insights into their age and provenance. Detrital zircons from metasediments from Jastrze{ogonek}bna and Mońki have Pb isotopic ages in the ranges 3.14-1.83 and 3.53-1.82 Ga, respectively. Similar results have been obtained from the Lithuanian Lazdijai and Bliudziai paragneisses. About 30% of the analysed Polish detrital zircon cores are of Late Archaean age (2.90-2.60 Ga) and about 70% are Palaeoproterozoic (2.10-1.90 Ga), similar to the age distributions of detrital zircon from Svecofennian metasediments exposed in Central Sweden and Southern Finland. The youngest detrital zircon sub-groups indicate max i mum deposition ages of about 1.86 Ga, similar to the ages of exposed Svecofennian sedimentary basins. Possible source rocks of comparable ages and affinities can be found within Fennoscandia, Greenland and Sarmatia.

    Original languageEnglish
    Pages (from-to)255-272
    Number of pages18
    JournalGeological Quarterly
    Volume53
    Issue number3
    Publication statusPublished - 2009

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