Apparent argon diffusive loss 40Ar/39Ar age spectra in amphiboles.

Wartho, J.-A. (1995) Apparent argon diffusive loss 40Ar/39Ar age spectra in amphiboles. Earth and Planetary Science Letters, 134 (3-4). pp. 393-407. DOI 10.1016/0012-821X(95)00113-Q.

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Detailed investigations have been made of two amphibole samples where 40Ar/39Ar age spectra have been interpreted to show argon diffusive loss. Both samples display complex compositional zoning that reflects partial major and minor element chemical re-equilibration during later thermal events that is associated with the loss of radiogenic 40Ar. The apparent diffusive loss age spectra in these samples are an artefact of this chemical re-equilibration process. One sample additionally shows the effect of potassium gain and contamination with a potassium-rich phase (biotite). The resulting ages in this sample are geologically meaningless and the apparent fit to a theoretical diffusive loss curve is coincidental. This study shows that volume diffusive loss of argon appears to operate at slower rates than argon loss by chemical re-equilibration in amphiboles.

Document Type: Article
Keywords: Argon; amphiboles
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/0012-821X(95)00113-Q
ISSN: 0012-821X
Date Deposited: 24 Nov 2015 10:23
Last Modified: 24 Nov 2015 10:23

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