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Fall, classification, and exposure history of the Mifflin L5 chondrite

Kita, Noriko T. ; Welten, Kees C. ; Valley, John W. ; Spicuzza, Michael J. ; Nakashima, Daisuke ; Tenner, Travis J. ; Ushikubo, Takayuki ; MacPherson, Glenn J. ; Welzenbach, Linda and Heck, Philipp R. , et al. (2013) In Meteoritics and Planetary Science 48(4). p.641-655
Abstract
The Mifflin meteorite fell on the night of April 14, 2010, in southwestern Wisconsin. A bright fireball was observed throughout a wide area of the midwestern United States. The petrography, mineral compositions, and oxygen isotope ratios indicate that the meteorite is a L5 chondrite fragmental breccia with light/dark structure. The meteorite shows a low shock stage of S2, although some shock-melted veins are present. The U,Th-He age is 0.7Ga, and the K-Ar age is 1.8Ga, indicating that Mifflin might have been heated at the time of the 470Ma L-chondrite parent body breakup and that U, Th-He, and K-Ar ages were partially reset. The cosmogenic radionuclide data indicate that Mifflin was exposed to cosmic rays while its radius was 3065cm.... (More)
The Mifflin meteorite fell on the night of April 14, 2010, in southwestern Wisconsin. A bright fireball was observed throughout a wide area of the midwestern United States. The petrography, mineral compositions, and oxygen isotope ratios indicate that the meteorite is a L5 chondrite fragmental breccia with light/dark structure. The meteorite shows a low shock stage of S2, although some shock-melted veins are present. The U,Th-He age is 0.7Ga, and the K-Ar age is 1.8Ga, indicating that Mifflin might have been heated at the time of the 470Ma L-chondrite parent body breakup and that U, Th-He, and K-Ar ages were partially reset. The cosmogenic radionuclide data indicate that Mifflin was exposed to cosmic rays while its radius was 3065cm. Assuming this exposure geometry, a cosmic-ray exposure age of 25 +/- 3Ma is calculated from cosmogenic noble gas concentrations. The low 22Ne/21Ne ratio may, however, indicate a two-stage exposure with a longer first-stage exposure at high shielding. Mifflin is unusual in having a low radiogenic gas content combined with a low shock stage and no evidence of late stage annealing; this inconsistency remains unexplained. (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Meteoritics and Planetary Science
volume
48
issue
4
pages
641 - 655
publisher
Wiley-Blackwell
external identifiers
  • wos:000318029400004
  • scopus:84876415397
ISSN
1086-9379
DOI
10.1111/maps.12077
language
English
LU publication?
yes
id
babd7a7e-1aa4-479a-9ce3-c066f5f3584e (old id 3851410)
date added to LUP
2016-04-01 13:26:25
date last changed
2022-01-27 19:14:11
@article{babd7a7e-1aa4-479a-9ce3-c066f5f3584e,
  abstract     = {{The Mifflin meteorite fell on the night of April 14, 2010, in southwestern Wisconsin. A bright fireball was observed throughout a wide area of the midwestern United States. The petrography, mineral compositions, and oxygen isotope ratios indicate that the meteorite is a L5 chondrite fragmental breccia with light/dark structure. The meteorite shows a low shock stage of S2, although some shock-melted veins are present. The U,Th-He age is 0.7Ga, and the K-Ar age is 1.8Ga, indicating that Mifflin might have been heated at the time of the 470Ma L-chondrite parent body breakup and that U, Th-He, and K-Ar ages were partially reset. The cosmogenic radionuclide data indicate that Mifflin was exposed to cosmic rays while its radius was 3065cm. Assuming this exposure geometry, a cosmic-ray exposure age of 25 +/- 3Ma is calculated from cosmogenic noble gas concentrations. The low 22Ne/21Ne ratio may, however, indicate a two-stage exposure with a longer first-stage exposure at high shielding. Mifflin is unusual in having a low radiogenic gas content combined with a low shock stage and no evidence of late stage annealing; this inconsistency remains unexplained.}},
  author       = {{Kita, Noriko T. and Welten, Kees C. and Valley, John W. and Spicuzza, Michael J. and Nakashima, Daisuke and Tenner, Travis J. and Ushikubo, Takayuki and MacPherson, Glenn J. and Welzenbach, Linda and Heck, Philipp R. and Davis, Andrew M. and Meier, Matthias and Wieler, Rainer and Caffee, Marc W. and Laubenstein, Matthias and Nishiizumi, Kunihiko}},
  issn         = {{1086-9379}},
  language     = {{eng}},
  number       = {{4}},
  pages        = {{641--655}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Meteoritics and Planetary Science}},
  title        = {{Fall, classification, and exposure history of the Mifflin L5 chondrite}},
  url          = {{http://dx.doi.org/10.1111/maps.12077}},
  doi          = {{10.1111/maps.12077}},
  volume       = {{48}},
  year         = {{2013}},
}