Computer Science
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.277..642c&link_type=abstract
Nature, Volume 277, Issue 5698, pp. 642-643 (1979).
Computer Science
15
Scientific paper
THE Scourie dyke swarm intrudes the Lewisian Complex in north-west Scotland. The structural state of these basic dykes is used to subdivide the Lewisian into the pre-dyke `Scourian' and post-dyke `Laxfordian' complexes1. The ~2,700 Myr (refs 2-4) pyroxene-granulite facies Scourian gneisses of the Assynt area contain undeformed NW-trending dykes. Gneisses and dykes, which underwent the ~1,900 Myr (refs 5, 6) Laxfordian event, are now deformed and metamorphosed at amphibolite facies. Previous K-Ar measurements for the Scourie dykes in the Assynt area of the Lewisian gave a minimum age for dyke injection of 2,200 Myr (ref. 7). Younger K-Ar ages were thought to reflect later Laxfordian overprinting. I report here a Rb-Sr whole-rock isochron age of 2,390+/-20 Myr (2σ) and an initial 87Sr/86Sr ratio of 0.7022+/-0.0001 (2σ) for the Scourie dykes.
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