Age, provenance and tectonostratigraphic status of the Mesoproterozoic Blefjell quartzite, Telemark sector, southern Norway

Tom Andersen, Kauko Laajoki, Ayesha Saeed

    Research output: Contribution to journalArticle

    28 Citations (Scopus)

    Abstract

    The Blefjell quartzite is ca. 40 × 6-10 km gneissic metasupracrustal occurrence deposited on a 1159 ± 8 Ma old felsic volcanite. It is part of a mature beach - shallow shelf complex deposited between ca. 1155 and 1145 Ma. LAM-ICPMS U-Pb ages of single, detrital zircons range from 1.40 to 2.07 Ga, with frequency maxima in the age-range 1.65-1.90 Ga. Younger zircons (1.53-1.64 and 1.40-1.50 Ga are less abundant. Present-day 176Hf/ 177Hf ranges from 0.2814 to 0.2822, corresponding to ε Hf(t) between -8 and +14. The minor and trace element distribution of the zircons suggest derivation from a range of mafic to granitic protosources, characterized by distinct, relative LREE enrichment or HREE depletion. The data confirm the presence of important 1.7-1.9 Ga protosources for Precambrian sediments in S Norway, indistinguishable in age and crustal history from rocks of the Transscandinavian Igneous Belt. This lends further support to regional tectonic models in which southern Norway west of the Oslo Rift has been an integral part of the Baltic Shield since the formation of the regional protolith in the Paleoprotoerozoic.

    Original languageEnglish
    Pages (from-to)217-244
    Number of pages28
    JournalPrecambrian Research
    Volume135
    Issue number3
    DOIs
    Publication statusPublished - 30 Nov 2004

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