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Fall, classificatio...
Fall, classification, and exposure history of the Mifflin L5 chondrite
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Kita, Noriko T. (author)
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Welten, Kees C. (author)
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Valley, John W. (author)
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Spicuzza, Michael J. (author)
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Nakashima, Daisuke (author)
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Tenner, Travis J. (author)
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Ushikubo, Takayuki (author)
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MacPherson, Glenn J. (author)
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Welzenbach, Linda (author)
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Heck, Philipp R. (author)
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Davis, Andrew M. (author)
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- Meier, Matthias (author)
- Lund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science
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Wieler, Rainer (author)
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Caffee, Marc W. (author)
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Laubenstein, Matthias (author)
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Nishiizumi, Kunihiko (author)
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(creator_code:org_t)
- 2013-03-04
- 2013
- English.
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In: Meteoritics and Planetary Science. - : Wiley. - 1086-9379. ; 48:4, s. 641-655
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Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Kita, Noriko T.
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Welten, Kees C.
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Valley, John W.
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Spicuzza, Michae ...
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Nakashima, Daisu ...
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Tenner, Travis J ...
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show more...
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Ushikubo, Takayu ...
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MacPherson, Glen ...
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Welzenbach, Lind ...
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Heck, Philipp R.
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Davis, Andrew M.
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Meier, Matthias
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Wieler, Rainer
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Caffee, Marc W.
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Laubenstein, Mat ...
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Nishiizumi, Kuni ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geology
- Articles in the publication
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Meteoritics and ...
- By the university
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Lund University