Computer Science
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..72..376w&link_type=abstract
Earth and Planetary Science Letters, Volume 72, Issue 4, p. 376-388.
Computer Science
24
Scientific paper
U-Pb zircon and whole-rock Rb-Sr, Sm-Nd and O isotope results are reported for granitoids from three Proterozoic provinces in Sweden that represent different crustal environments. The radiometric ages span the period 1.89-1.65 Ga and record events ranging from original igneous crystallisation to late metamorphic resetting. These events occurred at different times in the crustal segments. The O isotope ratios identify different crustal source materials for the granitoids. The Sm-Nd results indicate that the major crustal source components common to most of the granitoids formed shortly before 1.9 Ga, close in time to the formation of the earliest granitoids. Contributions from recycled Archaean basement are minimal. The geographically widespread occurrence of such crustal sources indicates that the period around 2 Ga was of great importance for the growth of new continental crust in Sweden.
Aftalion M.
Fallick Anthony E.
Hamilton J. P.
Michard Annie
Wilson Ryan M.
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