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2 laser allows controlled and progressive degassing of optically transmissive materials such as sanidine with minimal contribution to background levels of Ar [W. C. McIntosh and M. T. Heizler, U.S. Geol. Surv. Circ. 1107, 212 (1994); (18)]. Background levels (blanks) of argon isotopes were measured between every one or two samples, and corrections were based on regression of the values over time. Mass discrimination was monitored by analysis of 45 samples of purified air interspersed with analysis of the unknowns, yielding a mean value of 1.0026 ± 0.0002 per atomic mass unit based on a power law relation.
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36Ar to make a standard air correction.
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I. M. Villa, Schweiz. Mineral. Petrogr. Mitt. 71, 211 (1991); R. P. Esser, W. C. McIntosh, M. T. Heizler, P. R. Kyle, Eos 77 (no. 17), S91 (1996); W. C. McIntosh, R. P. Esser, T. I. Wilch, ibid.
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Eos
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1842390967
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note
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We thank T. Becker, G. Curtis, G. Heiken, K. Ludwig, E. Piccirillo, M. Piochi, A. Necco, and J. Sime for discussion and assistance. Supported by NSF (grants SBR94-08181, EAR94-05309, and EAR94-05347), the Ann and Gordon Getty Foundation, and the Osservatorio Vesuviano.
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