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U–Pb age and Lu–Hf signatures of detrital zircon from Palaeozoic sandstones in the Oslo Rift, Norway

Published online by Cambridge University Press:  29 October 2013

MAGNUS KRISTOFFERSEN ,
TOM ANDERSEN  and
ARILD ANDRESEN
MAGNUS KRISTOFFERSEN*
Affiliation:
Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N–0316 Oslo, Norway
TOM ANDERSEN
Affiliation:
Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N–0316 Oslo, Norway
ARILD ANDRESEN
Affiliation:
Department of Geosciences, University of Oslo, PO Box 1047 Blindern, N–0316 Oslo, Norway
*
*Author for correspondence: [email protected]
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Abstract

U–Pb and Lu–Hf isotope analyses of detrital zircon from the latest Ordovician (Hirnantian) Langøyene Formation, the Late Silurian Ringerike Group and the Late Carboniferous Asker Group in the Oslo Rift were obtained by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Overall the U–Pb dating yielded ages within the range 2861–313 Ma. The U–Pb age and Lu–Hf isotopic signatures correspond to virtually all known events of crustal evolution in Fennoscandia, as well as synorogenic intrusions from the Norwegian Caledonides. Such temporally and geographically diverse source areas likely reflect multiple episodes of sediment recycling in Fennoscandia, and highlights the intrinsic problem of using zircon as a tracer-mineral in ‘source to sink’ sedimentary provenance studies. In addition to its mostly Fennoscandia-derived detritus, the Asker Group also have zircon grains of Late Devonian – Late Carboniferous age. Since no rocks of these ages are known in Fennoscandia, these zircons are inferred to be derived from the Variscan Orogen of central Europe.

Keywords

Oslo GrabenZirconU–PbLu–Hf
Type
Original Articles
Information
Geological Magazine , Volume 151 , Issue 5 , September 2014 , pp. 816 - 829
Copyright
Copyright © Cambridge University Press 2013 

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