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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Granitic magmatism by melting of juvenile continental crust: New constraints on the source of Palaeoproterozoic granitoids in Fennoscandia from Hf isotopes in zircon
Journal of the Geological Society, Volume 166, No. 2, Year 2009
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Description
Zircons from nine Palaeoproterozoic granitoid intrusions within the southern part of the Fennoscandian Shield have been studied by laser ablation inductively coupled plasma source mass spectrometry to obtain U-Pb ages (in the range 1.88-1.68 Ga) and Hf isotope compositions. Six granitoids are from the 1.85-1.65 Ga Transscandinavian Igneous Belt; during that period more than 106 km3 of granitoid magma intruded the pre-existing crust. The large majority of magmatic zircons from the nine granitoids have a limited initial range, 176Hf/177Hf = 0.2816-0.2818, and define an evolutionary trend given by an initial value of εHf(1:88Ga) ≈+2 ± 3 at an average 176Lu/177Hf = 0.015. These data show that a geographically extensive, long-lived, relatively homogeneous, and dominant magma source resided within 2.1-1.86 Ga Svecofennian juvenile crust between 1.88 and 1.68 Ga. Zircon xenocrysts (1.91-1.98 Ga) with initial εHf = +0 to +2.5 from one of the intrusions provide additional evidence for such a long-lived crustal source of granitic magmas in central Fennoscandia. The granitoids were emplaced during a period of active mafic underplating that supplied heat to the anatectic zone in the lower-middle crust, but little or no mantle-derived Hf to the granitic magmas, in contrast to many mixed intermediate rocks. © 2009 Geological Society of London.
Authors & Co-Authors
Andersen, Tom A.M.
Norway, Oslo
Universitetet I Oslo
Andersson, U. B.
Sweden, Stockholm
Naturhistoriska Riksmuseet
Simonsen, Siri Lene
Norway, Oslo
Universitetet I Oslo
Statistics
Citations: 187
Authors: 3
Affiliations: 5
Identifiers
Doi:
10.1144/0016-76492007-166
ISSN:
00167649