Petrogenetic Significance of Initial 87Sr/86Sr Ratios in the North Atlantic Tertiary Igneous Province in the Light of Rb-Sr, K-Ar and 18O-abundance Studies of the Sarqata qaqa Intrusive Complex Ubekendt Ejland, West Greenland
- 1 January 1974
- journal article
- Published by Oxford University Press (OUP) in Journal of Petrology
- Vol. 15 (3) , 525-538
- https://doi.org/10.1093/petrology/15.3.525
Abstract
A single Rb-Sr whole rock ‘isochron’ from three gabbroic and six granitic samples from the Sarqâta qáqâ Complex, Ubekendt Ejland, yields an age and initial 87Sr/86Sr ratio of 65±5 m.y. (λβ = 1.47×10-11 yr-1) and 0.7045±0.0003. K-Ar measurements on two biotite separates from the gabbro give ages of 55.4±1.5 and 54.0±1.5 m.y. Determinations of 16O/18O ratios in two gabbro and four granite samples yield average δ values of ±5.53±0.04 and +6.74± 0.37% respectively, relative to SMOW.Keywords
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