Age of Labrador Anorthosites

Details Age of Labrador Anorthosites Age of Labrador Anorthosites

Aug 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964natur.203..509m&link_type=abstract

Nature, Volume 203, Issue 4944, pp. 509-510 (1964).

Physics

3

Scientific paper

THE age of the Nain anorthosite1,2 on the coast of Newfoundland-Labrador is probably the same as that of the Michikamau anorthosite (1,400 +/- 80 m.y.) recently reported by Emslie3. The Nain anorthosite is flanked on the north side by the Kiglapait layered intrusion4,5, which shows no chill against anorthosite and is therefore thought to be barely younger than the anorthosite. The Kiglapait intrusion is invaded on its north margin by a granodiorite, possibly rheomorpbic, the biotite of which gives a potassium-argon age6 of 1,480 +/- 50.m.y. This is therefore a minimum age for the Kiglapait intrusion, and also for the anorthosite.

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