The scale of Sr isotopic diffusion during post-metamorphic cooling of gneisses in the Inner Piedmont of Georgia, southern Appalachians

Details The scale of Sr isotopic diffusion during post-metamorphic cooling of gneisses in the Inner Piedmont of Georgia, southern Appalachians The scale of Sr isotopic diffusion during post-metamorphic cooling of gneisses in the Inner Piedmont of Georgia, southern Appalachians

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984e%26psl..68..141v&link_type=abstract

Earth and Planetary Science Letters, Volume 68, Issue 1, p. 141-150.

Mathematics

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4

Scientific paper

Rb-Sr whole-rock isotopic analyses of two suites of contiguous gneiss samples (each ca. 10 cm in width) collected in quarries within the Georgia Inner Piedmont of the southern Appalachians indicate that Sr isotopic diffusion continued on a scale of 10-25 cm for at least 30 Ma after culmination of high-grade regional metamorphism. Variation of Rb/Sr ratios between 14 contiguous slabs of one suite is sinusoidal about an overall mean of 1.5, permitting calculation of a 315 +/- 17 Ma isochron. On the basis of previous estimates of the scale of Sr diffusion in feldspar under geological conditions, an approximate closure temperature of 600°C may be calculated. Together with Rb-Sr and 40Ar/39Ar mineral ages from this quarry, the 315 +/- 17 Ma isochron age is interpreted to date cooling through ca. 600°C following culmination of high-grade Devonian regional metamorphism. The average Rb-Sr isotopic composition of a contiguous suite from another Inner Piedmont quarry confirms a Paleozoic age for regional metamorphism.

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