Mathematics – Logic
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..50..225k&link_type=abstract
Earth and Planetary Science Letters, Volume 50, Issue 1, p. 225-237.
Mathematics
Logic
2
Scientific paper
Rb-Sr whole-rock isochron ages of gneisses from the Fiskenaesset area are considerably lower (2600-2800 m.y.) than U-Pb zircon ages for the same rocks (2880-2950 m.y.). There is a significant correlation between the isochron ages and the range in Rb/Sr ratios of the samples involved. Higher ages (and lower initial 87Sr/86Sr ratios) are obtained for sample collections with a wide range in Rb/Sr ratios. Lower ages (and higher initial ratios) are obtained for sample collections with a narrow range in Rb/Sr ratios. This relationship is explained by a model of local metamorphic Sr isotope homogenisation in restricted rock volumes. This model implies that the individual isochron ages do not date specific geological events. There is a significant inverse correlation between the isochron ages and the corresponding initial ratios. It is probable that the igneous precursors of the gneisses intruded with initial 87Sr/86Sr ratios well below 0.701.
Kalsbeek Feiko
Pidgeon Robert T.
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