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An I-Xe Constraint on the Age of the CB Chondrites, and a Reevaluation of the Closure Age of Shallowater Enstatite

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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An I-Xe Constraint on the Age of the CB Chondrites, and a Reevaluation of the Closure Age of Shallowater Enstatite. / Gilmour, Jamie; Crowther, Sarah; Busfield, Alli et al.
In: Meteoritics and Planetary Science, Vol. 44, No. 4, 04.2009, p. 573-579.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Gilmour, J, Crowther, S, Busfield, A, Holland, G & Whitby, J 2009, 'An I-Xe Constraint on the Age of the CB Chondrites, and a Reevaluation of the Closure Age of Shallowater Enstatite', Meteoritics and Planetary Science, vol. 44, no. 4, pp. 573-579. https://doi.org/10.1111/j.1945-5100.2009.tb00752.x

APA

Gilmour, J., Crowther, S., Busfield, A., Holland, G., & Whitby, J. (2009). An I-Xe Constraint on the Age of the CB Chondrites, and a Reevaluation of the Closure Age of Shallowater Enstatite. Meteoritics and Planetary Science, 44(4), 573-579. https://doi.org/10.1111/j.1945-5100.2009.tb00752.x

Vancouver

Gilmour J, Crowther S, Busfield A, Holland G, Whitby J. An I-Xe Constraint on the Age of the CB Chondrites, and a Reevaluation of the Closure Age of Shallowater Enstatite. Meteoritics and Planetary Science. 2009 Apr;44(4):573-579. doi: 10.1111/j.1945-5100.2009.tb00752.x

Author

Gilmour, Jamie ; Crowther, Sarah ; Busfield, Alli et al. / An I-Xe Constraint on the Age of the CB Chondrites, and a Reevaluation of the Closure Age of Shallowater Enstatite. In: Meteoritics and Planetary Science. 2009 ; Vol. 44, No. 4. pp. 573-579.

Bibtex

@article{26bddc8c73104eb690f7a32f933d6a55,
title = "An I-Xe Constraint on the Age of the CB Chondrites, and a Reevaluation 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 (1{\`s}). 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.",
author = "Jamie Gilmour and Sarah Crowther and Alli Busfield and Greg Holland and James Whitby",
year = "2009",
month = apr,
doi = "10.1111/j.1945-5100.2009.tb00752.x",
language = "English",
volume = "44",
pages = "573--579",
journal = "Meteoritics and Planetary Science",
issn = "1086-9379",
publisher = "The University of Arkansas Press",
number = "4",

}

RIS

TY - JOUR

T1 - An I-Xe Constraint on the Age of the CB Chondrites, and a Reevaluation of the Closure Age of Shallowater Enstatite

AU - Gilmour, Jamie

AU - Crowther, Sarah

AU - Busfield, Alli

AU - Holland, Greg

AU - Whitby, James

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 (1s̀). 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.

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 (1s̀). 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.

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

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

M3 - Journal article

VL - 44

SP - 573

EP - 579

JO - Meteoritics and Planetary Science

JF - Meteoritics and Planetary Science

SN - 1086-9379

IS - 4

ER -