40 Ar- 39 Ar ages and trace element contents of Apollo 14 breccias; an interlaboratory cross-calibration of 40 Ar- 39 Ar standards

Details 40 Ar- 39 Ar ages and trace element contents of Apollo 14 breccias; an interlaboratory cross-calibration of 40 Ar- 39 Ar standards 40 Ar- 39 Ar ages and trace element contents of Apollo 14 breccias; an interlaboratory cross-calibration of 40 Ar- 39 Ar standards

Jun 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974gecoa..38..911a&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 38, Issue 6, pp.911-928

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Scientific paper

Rare gas data are presented from step-wise heatings of lunar breccias 14066 and 14318 and from an interlaboratory cross-calibration of five standards used in 40 Ar- 39 Ar dating. Four samples of 14066 all show depressed 40* Ar/ 39* Ar ratios at high temperatures, thus making age interpretation uncertain. While different in detail, the Ar release patterns in the four samples yield indistinguishable plateau ages of 3.93 ± 0.03 b.y. and > 400°C total ages of 3.87 ± 0.06 b.y. Concentrations of K, Ca, Ba, Br, U and I are given for 14318 and 14066. We also present an updating of all of the 40 Ar- 39 Ar ages and trace element concentrations previously published by this laboratory. 40 Ar- 39 Ar dating standards from Menlo Park, Pasadena, Stony Brook, Toronto and Berkeley are calibrated against each other and the internal homogeneity of their 40* Ar/K ratios is tested. The Berkeley standard (from the St. Severin meteorite) has an age of 4.504 ± 0.020 b.y. from this intercalibration. 80 Kr from capture of lunar neutrons is detected in 14318. A comparison of the release pattern of the 80 Kr produced by lunar neutrons with the 80,82 Kr produced by pile neutrons in 14318, indicates that 14318 has lost approximately 35 per cent of the 80 Kr produced by lunar neutrons.

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