Dating blueschist metamorphism: A combined 40 Ar/ 39 Ar and electron microprobe approach

Details Dating blueschist metamorphism: A combined 40 Ar/ 39 Ar and electron microprobe approach Dating blueschist metamorphism: A combined 40 Ar/ 39 Ar and electron microprobe approach

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2111s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 50, Issue 9, pp.2111-2117

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10

Scientific paper

40 Ar / 39 Ar and electron microprobe examination of blueschist samples from the Iceberg Lake schist, southern Alaska suggest that phengite inclusions are the source of 40 Ar in crossite. Because such finegrained inclusions may be susceptible to argon loss, caution should be exercised in interpreting K-Ar ages from this phase, and possibly other low-K amphiboles from blueschist suites. The estimated blocking temperature for phengite in the matrix (314° to 450°C), however, is close to the estimated peak metamorphic temperatures (325° ± 50° C ), suggesting that phengite 40 Ar / 39 Ar plateau dates may coincide closely with the time of blueschist metamorphism.

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