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

Jisun Park, Brent D. Turrin, Gregory F. Herzog, Fara N. Lindsay, Jeremy S. Delaney, Carl C. Swisher, Masayuki Uesugi, Yuzuru Karouji, Toru Yada, Masanao Abe, Tatsuaki Okada, Yukihiro Ishibashi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The Hayabusa mission to asteroid 25143, Itokawa, brought back 2000 small particles, which most closely resemble material found in LL4-6 chondrites. We report an 40Ar/39Ar 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 LL chondrites but close to one for Y-790964 and its pairs. The flat 40Ar/39Ar 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.

Original languageEnglish (US)
Pages (from-to)2087-2098
Number of pages12
JournalMeteoritics and Planetary Science
Volume50
Issue number12
DOIs
StatePublished - Dec 1 2015

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solar heating
chondrites
piles
asteroids
solar system
asteroid
heating
degassing
chondrite
histories
orbits
pile
material
history

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Space and Planetary Science

Cite this

Park, Jisun ; Turrin, Brent D. ; Herzog, Gregory F. ; Lindsay, Fara N. ; Delaney, Jeremy S. ; Swisher, Carl C. ; Uesugi, Masayuki ; Karouji, Yuzuru ; Yada, Toru ; Abe, Masanao ; Okada, Tatsuaki ; Ishibashi, Yukihiro. / 40Ar/39Ar age of material returned from asteroid 25143 Itokawa. In: Meteoritics and Planetary Science. 2015 ; Vol. 50, No. 12. pp. 2087-2098.
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abstract = "The Hayabusa mission to asteroid 25143, Itokawa, brought back 2000 small particles, which most closely resemble material found in LL4-6 chondrites. We report an 40Ar/39Ar 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 LL chondrites but close to one for Y-790964 and its pairs. The flat 40Ar/39Ar 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.",
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Park, J, Turrin, BD, Herzog, GF, Lindsay, FN, Delaney, JS, Swisher, CC, Uesugi, M, Karouji, Y, Yada, T, Abe, M, Okada, T & Ishibashi, Y 2015, '40Ar/39Ar age of material returned from asteroid 25143 Itokawa', Meteoritics and Planetary Science, vol. 50, no. 12, pp. 2087-2098. https://doi.org/10.1111/maps.12564

40Ar/39Ar age of material returned from asteroid 25143 Itokawa. / Park, Jisun; Turrin, Brent D.; Herzog, Gregory F.; Lindsay, Fara N.; Delaney, Jeremy S.; Swisher, Carl C.; Uesugi, Masayuki; Karouji, Yuzuru; Yada, Toru; Abe, Masanao; Okada, Tatsuaki; Ishibashi, Yukihiro.

In: Meteoritics and Planetary Science, Vol. 50, No. 12, 01.12.2015, p. 2087-2098.

Research output: Contribution to journalArticle

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AU - Turrin, Brent D.

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AU - Swisher, Carl C.

AU - Uesugi, Masayuki

AU - Karouji, Yuzuru

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AU - Ishibashi, Yukihiro

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