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Title: Cosmic-ray production rates for sup 3 He, sup 21 Ne, sup 38 Ar, sup 83 Kr, and sup 126 Xe in chondrites based on sup 81 Kr-Kr exposure ages

Abstract

{sup 81}Kr-Kr exposure ages and the isotopic abundances of He, Ne, Ar, Kr, and Xe were measured for thirteen ordinary chondrites. Together with the {sup 81}Kr-Kr ages for four chondrites obtained earlier in our laboratory and two chondrites reported by other authors, this data based used to derive cosmic-ray production rates for {sup 3}He, {sup 2}Ne, {sup 38}Ar, {sup 83}Kr, and {sup 126}Xe. Production rates are obtained as a function of the shielding dependent cosmogenic ratio ({sup 22}Ne/{sup 21}Ne){sub c} and of the chemical composition of CI, CM, CO, CV, H, L, LL, EH, and EL chondrites. Exposure ages were calculated from cosmogenic {sup 3}He, {sup 21}Ne, and {sup 38}Ar concentrations in eleven chondrites which lack Kr data. The good agreement of the ages derived from different noble gases demonstrates the consistency of the adopted production rates. Finally, noble gas data from mineral separates and from stepped temperature fractions show that Kr and Xe extracted between 700 and 1200{degree}C from a feldspar-rich separate have large excesses of the cosmogenic component. This should result in more accurate {sup 81}Kr-Kr and {sup 126}Xe ages then bulk chondrites analyses.

Authors:
 [1]
  1. Univ. of Bern (Switzerland)
Publication Date:
OSTI Identifier:
5557615
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta; (USA)
Additional Journal Information:
Journal Volume: 52:6; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHONDRITES; CHEMICAL COMPOSITION; COSMIC RAY PROPAGATION; ISOTOPE DATING; ARGON 38; HELIUM 3; ISOTOPE RATIO; KRYPTON 81; KRYPTON 83; NEON 21; XENON 126; AGE ESTIMATION; ARGON ISOTOPES; BETA DECAY RADIOISOTOPES; ELECTRON CAPTURE RADIOISOTOPES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HELIUM ISOTOPES; HOURS LIVING RADIOISOTOPES; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; KRYPTON ISOTOPES; LIGHT NUCLEI; METEORITES; NEON ISOTOPES; NUCLEI; RADIOISOTOPES; SECONDS LIVING RADIOISOTOPES; STABLE ISOTOPES; STONE METEORITES; XENON ISOTOPES; YEARS LIVING RADIOISOTOPES; 580400* - Geochemistry- (-1989); 580100 - Geology & Hydrology- (-1989); 640101 - Astrophysics & Cosmology- Cosmic Radiation

Citation Formats

Eugster, O. Cosmic-ray production rates for sup 3 He, sup 21 Ne, sup 38 Ar, sup 83 Kr, and sup 126 Xe in chondrites based on sup 81 Kr-Kr exposure ages. United States: N. p., 1988. Web. doi:10.1016/0016-7037(88)90233-5.
Eugster, O. Cosmic-ray production rates for sup 3 He, sup 21 Ne, sup 38 Ar, sup 83 Kr, and sup 126 Xe in chondrites based on sup 81 Kr-Kr exposure ages. United States. https://doi.org/10.1016/0016-7037(88)90233-5
Eugster, O. Wed . "Cosmic-ray production rates for sup 3 He, sup 21 Ne, sup 38 Ar, sup 83 Kr, and sup 126 Xe in chondrites based on sup 81 Kr-Kr exposure ages". United States. https://doi.org/10.1016/0016-7037(88)90233-5.
@article{osti_5557615,
title = {Cosmic-ray production rates for sup 3 He, sup 21 Ne, sup 38 Ar, sup 83 Kr, and sup 126 Xe in chondrites based on sup 81 Kr-Kr exposure ages},
author = {Eugster, O},
abstractNote = {{sup 81}Kr-Kr exposure ages and the isotopic abundances of He, Ne, Ar, Kr, and Xe were measured for thirteen ordinary chondrites. Together with the {sup 81}Kr-Kr ages for four chondrites obtained earlier in our laboratory and two chondrites reported by other authors, this data based used to derive cosmic-ray production rates for {sup 3}He, {sup 2}Ne, {sup 38}Ar, {sup 83}Kr, and {sup 126}Xe. Production rates are obtained as a function of the shielding dependent cosmogenic ratio ({sup 22}Ne/{sup 21}Ne){sub c} and of the chemical composition of CI, CM, CO, CV, H, L, LL, EH, and EL chondrites. Exposure ages were calculated from cosmogenic {sup 3}He, {sup 21}Ne, and {sup 38}Ar concentrations in eleven chondrites which lack Kr data. The good agreement of the ages derived from different noble gases demonstrates the consistency of the adopted production rates. Finally, noble gas data from mineral separates and from stepped temperature fractions show that Kr and Xe extracted between 700 and 1200{degree}C from a feldspar-rich separate have large excesses of the cosmogenic component. This should result in more accurate {sup 81}Kr-Kr and {sup 126}Xe ages then bulk chondrites analyses.},
doi = {10.1016/0016-7037(88)90233-5},
url = {https://www.osti.gov/biblio/5557615}, journal = {Geochimica et Cosmochimica Acta; (USA)},
issn = {0016-7037},
number = ,
volume = 52:6,
place = {United States},
year = {1988},
month = {6}
}