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Cosmogenic neon produced from sodium in meteoritic minerals

Smith, S. P. and Huneke, J. C. (1975) Cosmogenic neon produced from sodium in meteoritic minerals. Earth and Planetary Science Letters, 27 (2). pp. 191-199. ISSN 0012-821X.

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Cosmogenic neon in sodium-rich oligoclase feldspar from the ordinary chondrites St. Severin and Guareña is characterized by an unusually high ^(22)Ne/^(21_Ne = 1.50 ± 0.02. This high ratio is due to the cosmogenic22Ne/21Ne production ratio in sodium which is 2.9 ± 0.3, two to three times the production ratio in any other target element. The relative production rate of ^(21)Ne per gram sodium is one quarter the production rate per gram magnesium. The striking enrichment of ^(22)Ne relative to ^(21)Ne in sodium arises from enhanced indirect production from ^(23)Na via ^(22)Na. The unusual composition of cosmogenic neon in sodium and sodium-rich minerals explains the high ^(22)Ne/^(21)Ne ratios observed in inclusions of the Allende carbonaceous chondrite, and observed during low-temperature extraction of neon from ordinary chondrites. The isotopic composition of cosmogenic neon released during the stepwise heating of a trapped gas-rich meteorite containing sodium-rich phases can be expected to vary, and use of a constant cosmogenic neon composition to derive the composition of the trapped gas may not be justified. Preferential loss of this ^(22)Ne-enriched cosmogenic neon from meteoritic feldspar can result in a 2–3% drop in the measured cosmogenic ^(22)Ne/^(21)Ne ratio in a bulk meteorite sample. This apparent change in composition can lead to overestimation of the minimum pre-atmospheric mass of the meteorite by a factor of two.

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Additional Information:© 1975 Elsevier B.V. Received 12 May 1975, Revised 19 June 1975. We thank G.J. Wasserburg for the mineral separates and for suggestions leading to great simplification in the presentation and discussion of the data. We also thank D.D. Bogard and D. Heymann for review comments aiding in the revision of the manuscript. This work was supported by NSF grant GP-28027. Contribution No. 2606, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.
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Caltech Division of Geological and Planetary Sciences2606
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Official Citation:S.P. Smith, J.C. Huneke, Cosmogenic neon produced from sodium in meteoritic minerals, Earth and Planetary Science Letters, Volume 27, Issue 2, 1975, Pages 191-199, ISSN 0012-821X, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76984
Deposited By: Tony Diaz
Deposited On:27 Apr 2017 16:24
Last Modified:03 Oct 2019 17:52

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