Possible two-stage 87Sr evolution in the Stockdale Rhyolite

Details Possible two-stage 87Sr evolution in the Stockdale Rhyolite Possible two-stage 87Sr evolution in the Stockdale Rhyolite

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..61..297c&link_type=abstract

Earth and Planetary Science Letters, Volume 61, Issue 2, p. 297-302.

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The Rb-Sr total-rock data for the Stockdale Rhyolite, of significance for the Palaeozoic time scale, are more scattered about a single-stage isochron than expected from experimental error. Two-stage 87Sr evolution for several of the samples is explored to explain this, as an alternative to variation in the initial 87Sr/86Sr which is customarily used in single-stage dating models. The deletion of certain samples having very high Rb/Sr removes most of the excess scatter and leads to an estimate of 430 +/- 7 m.y. for the age of extrusion. There is a younger alignment of Rb-Sr data within each sampling site at 412 +/- 7 m.y. We suggest that the Stockdale Rhyolite is at least 430 m.y. old, that its original range in Rb/Sr was smaller than now observed, and that it experienced a net loss in Sr during later hydrothermal alteration at ca. 412 m.y.

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