An early I-Xe age of the CB Chondrite chondrule formation, and a Re-evaluation of the closure age of Shallowater enstatite

J. D. Gilmour; S. A. Crowther; A. Busfield; Greg Holland; J. A. Whitby

doi:10.1111/j.1945-5100.2009.tb00752.x

An early I-Xe age of the CB Chondrite chondrule formation, and a Re-evaluation of the closure age of Shallowater enstatite

J. D. Gilmour, S. A. Crowther, A. Busfield, Greg Holland, J. A. Whitby

Research output: Contribution to journal › Article › peer-review

Abstract

The iodine xenon system has been analyzed in samples of 7 chondrules from the CB chondrites Gujba and Hammadah al Hamra (HaH) 237. One sample from Gujba defined a high temperature iodine xenon isochron corresponding to closure 1.87 ± 0.4 Ma before closure of Shallowater enstatite. Motivated by this result, we employ outlier rejection to re evaluate the Shallowater age, leading to a modified value of 4562.3 ± 0.4 Ma (1σ). In this process, the datum obtained by combining our I Xe age for Gujba with the literature Pb Pb age is rejected as an outlier, indicating that in this sample the I Xe system closed earlier than the accepted Pb Pb age of chondrules from CB chondrites. The need for a formation environment distinct from that of chondrules from other meteorites is thus reduced. © The Meteoritical Society, 2009.

Original language	English
Pages (from-to)	573-579
Number of pages	7
Journal	Meteoritics & Planetary Science
Volume	44
Issue number	4
DOIs	https://doi.org/10.1111/j.1945-5100.2009.tb00752.x https://doi.org/10.1111/j.1945-5100.2009.tb00752.x
Publication status	Published - Apr 2009

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@article{b20051199d6d4ff8a85eada03993f338,

title = "An early I-Xe age of the CB Chondrite chondrule formation, and a Re-evaluation of the closure age of Shallowater enstatite",

abstract = "The iodine xenon system has been analyzed in samples of 7 chondrules from the CB chondrites Gujba and Hammadah al Hamra (HaH) 237. One sample from Gujba defined a high temperature iodine xenon isochron corresponding to closure 1.87 ± 0.4 Ma before closure of Shallowater enstatite. Motivated by this result, we employ outlier rejection to re evaluate the Shallowater age, leading to a modified value of 4562.3 ± 0.4 Ma (1σ). In this process, the datum obtained by combining our I Xe age for Gujba with the literature Pb Pb age is rejected as an outlier, indicating that in this sample the I Xe system closed earlier than the accepted Pb Pb age of chondrules from CB chondrites. The need for a formation environment distinct from that of chondrules from other meteorites is thus reduced. {\textcopyright} The Meteoritical Society, 2009.",

author = "Gilmour, {J. D.} and Crowther, {S. A.} and A. Busfield and Greg Holland and Whitby, {J. A.}",

note = "This work was funded by the Particle Physics and Astronomy Research Council (now Science and Technology Facilities Council) and by the Royal Society.",

year = "2009",

month = apr,

doi = "10.1111/j.1945-5100.2009.tb00752.x",

language = "English",

volume = "44",

pages = "573--579",

journal = "Meteoritics & Planetary Science",

issn = "1945-5100",

publisher = "John Wiley & Sons Ltd",

number = "4",

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TY - JOUR

T1 - An early I-Xe age of the CB Chondrite chondrule formation, and a Re-evaluation of the closure age of Shallowater enstatite

AU - Gilmour, J. D.

AU - Crowther, S. A.

AU - Busfield, A.

AU - Holland, Greg

AU - Whitby, J. A.

N1 - This work was funded by the Particle Physics and Astronomy Research Council (now Science and Technology Facilities Council) and by the Royal Society.

PY - 2009/4

Y1 - 2009/4

N2 - The iodine xenon system has been analyzed in samples of 7 chondrules from the CB chondrites Gujba and Hammadah al Hamra (HaH) 237. One sample from Gujba defined a high temperature iodine xenon isochron corresponding to closure 1.87 ± 0.4 Ma before closure of Shallowater enstatite. Motivated by this result, we employ outlier rejection to re evaluate the Shallowater age, leading to a modified value of 4562.3 ± 0.4 Ma (1σ). In this process, the datum obtained by combining our I Xe age for Gujba with the literature Pb Pb age is rejected as an outlier, indicating that in this sample the I Xe system closed earlier than the accepted Pb Pb age of chondrules from CB chondrites. The need for a formation environment distinct from that of chondrules from other meteorites is thus reduced. © The Meteoritical Society, 2009.

AB - The iodine xenon system has been analyzed in samples of 7 chondrules from the CB chondrites Gujba and Hammadah al Hamra (HaH) 237. One sample from Gujba defined a high temperature iodine xenon isochron corresponding to closure 1.87 ± 0.4 Ma before closure of Shallowater enstatite. Motivated by this result, we employ outlier rejection to re evaluate the Shallowater age, leading to a modified value of 4562.3 ± 0.4 Ma (1σ). In this process, the datum obtained by combining our I Xe age for Gujba with the literature Pb Pb age is rejected as an outlier, indicating that in this sample the I Xe system closed earlier than the accepted Pb Pb age of chondrules from CB chondrites. The need for a formation environment distinct from that of chondrules from other meteorites is thus reduced. © The Meteoritical Society, 2009.

U2 - 10.1111/j.1945-5100.2009.tb00752.x

DO - 10.1111/j.1945-5100.2009.tb00752.x

M3 - Article

SN - 1945-5100

VL - 44

SP - 573

EP - 579

JO - Meteoritics & Planetary Science

JF - Meteoritics & Planetary Science

IS - 4

ER -

An early I-Xe age of the CB Chondrite chondrule formation, and a Re-evaluation of the closure age of Shallowater enstatite

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