Other
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.105..405c&link_type=abstract
Earth and Planetary Science Letters, Volume 105, Issue 4, p. 405-415.
Other
5
Scientific paper
We report the results of a 40Ar/39Ar study of rocks from the Britt domain, northwestern Grenville Province. Most of the age spectra obtained for micas and amphiboles have well defined age plateaus. Typically, K-feldspars yielded spectra with age gradients and Arrhenius plots with kinks or offsets. Hence, some of the data were interpreted in terms of a multi-diffusion domain-size model. This 40Ar/39Ar data base (5 amphiboles, 9 micas, 4 K-feldspar), along with some recently acquired U-Pb data, provide reasonable constraints on the post-peak metamorphic cooling history which began at depth in the upper amphibolite facies. Comparison of the data with exhumation paths generated by thermal models suggest that cooling, taking place over ~ 400 Ma, was for the most part due to erosionally controlled exhumation. Although the decompression may have initiated with a short period of rapid (extensional?) uplift, the entire cooling history may have been erosionally controlled. There is an apparent difference in cooling ages between north and south in the 40Ar/39Ar mica and K-feldspar data for the Britt domain, which may be due to somewhat higher exhumation rates in the north and/or an elevated geotherm in the south.
Check G.
Culshaw N.
Reynolds P. H.
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