<sup>40</sup>Ar/<sup>39</sup>Ar age of material returned from asteroid 25143 Itokawa

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  • Jisun Park
    Department of Chemistry and Chemical Biology Rutgers University Piscataway New Jersey 08854 USA
  • Brent D. Turrin
    Department of Earth and Planetary Science Rutgers University Piscataway New Jersey 08854 USA
  • Gregory F. Herzog
    Department of Chemistry and Chemical Biology Rutgers University Piscataway New Jersey 08854 USA
  • Fara N. Lindsay
    Department of Chemistry and Chemical Biology Rutgers University Piscataway New Jersey 08854 USA
  • Jeremy S. Delaney
    Department of Chemistry and Chemical Biology Rutgers University Piscataway New Jersey 08854 USA
  • Carl C. Swisher
    Department of Earth and Planetary Science Rutgers University Piscataway New Jersey 08854 USA
  • Masayuki Uesugi
    Institute of Space and Astronautical Sciences (ISAS) of the Japan Aerospace Exploration Agency (JAXA) Sagamihara 252‐5210 Japan
  • Yuzuru Karouji
    Institute of Space and Astronautical Sciences (ISAS) of the Japan Aerospace Exploration Agency (JAXA) Sagamihara 252‐5210 Japan
  • Toru Yada
    Institute of Space and Astronautical Sciences (ISAS) of the Japan Aerospace Exploration Agency (JAXA) Sagamihara 252‐5210 Japan
  • Masanao Abe
    Institute of Space and Astronautical Sciences (ISAS) of the Japan Aerospace Exploration Agency (JAXA) Sagamihara 252‐5210 Japan
  • Tatsuaki Okada
    Institute of Space and Astronautical Sciences (ISAS) of the Japan Aerospace Exploration Agency (JAXA) Sagamihara 252‐5210 Japan
  • Yukihiro Ishibashi
    Institute of Space and Astronautical Sciences (ISAS) of the Japan Aerospace Exploration Agency (JAXA) Sagamihara 252‐5210 Japan

書誌事項

公開日
2015-11-06
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/maps.12564
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>The Hayabusa mission to asteroid 25143, Itokawa, brought back 2000 small particles, which most closely resemble material found in<jats:styled-content style="fixed-case">LL</jats:styled-content>4‐6 chondrites. We report an<jats:sup>40</jats:sup>Ar/<jats:sup>39</jats:sup>Ar age of 1.3 ± 0.3 Ga for a sample of Itokawa consisting of three grains with a total mass of ~2 μg. This age is lower than the >4.0 Ga ages measured for 75% of<jats:styled-content style="fixed-case">LL</jats:styled-content>chondrites but close to one for Y‐790964 and its pairs. The flat<jats:sup>40</jats:sup>Ar/<jats:sup>39</jats:sup>Ar release spectrum of the sample suggests complete degassing 1.3 Ga ago. Recent solar heating in Itokawa's current orbit does not appear likely to have reset that age. Solar or impact heating 1.3 Ga ago could have done so. If impact heating was responsible, then the 1.3 Ga age sets an upper bound on the time at which the Itokawa rubble pile was assembled and suggests that rubble pile creation was an ongoing process in the inner solar system for at least the first 3 billion years of solar system history.</jats:p>

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