Terrestrial ages, pairing, and concentration mechanism of Antarctic chondrites from Frontier Mountain, Northern Victoria Land

K. C. Welten, K. Nishiizumi, M. W. Caffee, D. J. Hillegonds, J. A. Johnson, A. J T Jull, R. Wieler, L. Folco

Research output: Contribution to journalArticle

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Abstract

We report concentrations of cosmogenic 10Be, 26Al, 36Cl, and 41Ca in the metal phase of 26 ordinary chondrites from Frontier Mountain (FRO), Antarctica, as well as cosmogenic 14C in eight and noble gases in four bulk samples. Thirteen out of 14 selected H chondrites belong to two previously identified pairing groups, FRO 90001 and FRO 90174, with terrestrial ages of ∼40 and ∼100 kyr, respectively. The FRO 90174 shower is a heterogeneous H3-6 chondrite breccia that probably includes more than 300 individual fragments, explaining the high H/L chondrite ratio (3.8) at Frontier Mountain. The geographic distribution of 19 fragments of this shower constrains ice fluctuations over the past 50-100 kyr to less than ∼40 m, supporting the stability of the meteorite trap over the last glacial cycle. The second H-chondrite pairing group, FRO 90001, is much smaller and its geographic distribution is mainly controlled by wind-transport. Most L-chondrites are younger than 50 kyr, except for the FRO 93009/01172 pair, which has a terrestrial age of ∼500 kyr. These two old L chondrites represent the only surviving members of a large shower with a similar preatmospheric radius (∼80 cm) as the FRO 90174 shower. The find locations of these two paired L-chondrite fragments on opposite sides of Frontier Mountain confirm the general glaciological model in which the two ice flows passing both ends of the mountain are derived from the same source area on the plateau. The 50 FRO meteorites analyzed so far represent 21 different falls. The terrestrial ages range from 6 kyr to 500 kyr, supporting the earlier proposed concentration mechanism.

Original languageEnglish (US)
Pages (from-to)1081-1094
Number of pages14
JournalMeteoritics and Planetary Science
Volume41
Issue number7
StatePublished - Jul 2006
Externally publishedYes

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chondrites
chondrite
mountains
mountain
showers
geographic distribution
fragments
meteorites
meteorite
ice
land
breccia
ordinary chondrite
noble gas
ice flow
Antarctic regions
Last Glacial
rare gases
plateaus
traps

ASJC Scopus subject areas

  • Geophysics

Cite this

Welten, K. C., Nishiizumi, K., Caffee, M. W., Hillegonds, D. J., Johnson, J. A., Jull, A. J. T., ... Folco, L. (2006). Terrestrial ages, pairing, and concentration mechanism of Antarctic chondrites from Frontier Mountain, Northern Victoria Land. Meteoritics and Planetary Science, 41(7), 1081-1094.

Terrestrial ages, pairing, and concentration mechanism of Antarctic chondrites from Frontier Mountain, Northern Victoria Land. / Welten, K. C.; Nishiizumi, K.; Caffee, M. W.; Hillegonds, D. J.; Johnson, J. A.; Jull, A. J T; Wieler, R.; Folco, L.

In: Meteoritics and Planetary Science, Vol. 41, No. 7, 07.2006, p. 1081-1094.

Research output: Contribution to journalArticle

Welten, KC, Nishiizumi, K, Caffee, MW, Hillegonds, DJ, Johnson, JA, Jull, AJT, Wieler, R & Folco, L 2006, 'Terrestrial ages, pairing, and concentration mechanism of Antarctic chondrites from Frontier Mountain, Northern Victoria Land', Meteoritics and Planetary Science, vol. 41, no. 7, pp. 1081-1094.
Welten KC, Nishiizumi K, Caffee MW, Hillegonds DJ, Johnson JA, Jull AJT et al. Terrestrial ages, pairing, and concentration mechanism of Antarctic chondrites from Frontier Mountain, Northern Victoria Land. Meteoritics and Planetary Science. 2006 Jul;41(7):1081-1094.
Welten, K. C. ; Nishiizumi, K. ; Caffee, M. W. ; Hillegonds, D. J. ; Johnson, J. A. ; Jull, A. J T ; Wieler, R. ; Folco, L. / Terrestrial ages, pairing, and concentration mechanism of Antarctic chondrites from Frontier Mountain, Northern Victoria Land. In: Meteoritics and Planetary Science. 2006 ; Vol. 41, No. 7. pp. 1081-1094.
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AU - Nishiizumi, K.

AU - Caffee, M. W.

AU - Hillegonds, D. J.

AU - Johnson, J. A.

AU - Jull, A. J T

AU - Wieler, R.

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