Mathematics – Logic
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.104...70w&link_type=abstract
Earth and Planetary Science Letters (ISSN 0012-821X), vol. 104, no. 1, May 1991, p. 70-79. Research supported by NSERC and Ontar
Mathematics
Logic
12
Argon Isotopes, Biotite, Geochemistry, Grain Size, Radioactive Age Determination, Temperature Effects, Data Correlation, Laser Spectroscopy, Planetary Evolution
Scientific paper
Single grains of biotite extracted from two hand samples of two granitoid rocks from the Red Lake greenstone belt of northwestern Ontario were examined using a high-sensitivity Ar-40/Ar-39 laser dating system for variations in age. For small grains a striking correlation is seen between the ages and the grain sizes, as measured by the cylindrical radii, with smaller samples yielding younger ages. This effect saturates at a radius of about 225 microns, above which the integrated age is independent of grain size. By combining this grain size effect with biotite diffusion parameters taken from the literature, continuous cooling curves were derived for the region. These curves suggest the region cooled at a rate of about 0.3 C/Myr between 2635 and 2570 Ma.
Layer Paul W.
Wright Norrie
York Derek
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