Iodine-xenon studies of Allende inclusions: Eggs and the Pink Angel

T. D. Swindle; M. W. Caffee; C. M. Hohenberg

doi:10.1016/0016-7037(88)90124-X

Iodine-xenon studies of Allende inclusions: Eggs and the Pink Angel

T. D. Swindle, M. W. Caffee, C. M. Hohenberg

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Abstract

The iodine-xenon systems of six Allende inclusions (five Eggs and the Pink Angel) appear to have been altered by non-nebular secondary processes. Evidence for this includes temperature-ordered variations in the initial I isotopic composition within several objects (with older apparent I-Xe ages associated with higher extraction temperatures) and the absence of primitive I-Xe ages. The span of apparent ages seen in Allende objects (10 Ma or more) is probably too long to reflect any nebular process, so at least some alteration probably occurred on the parent body. The range in initial ²⁴⁴Pu²³⁸U ratios for the Eggs (3-14 × 10^-3) includes the current best estimates of the bulk solar system value (4-7 × 10^-3). For Egg 3, the Pu U ratio varies by a factor of two between extractions, probably the result of fractionation of Pu from U among different phases.

Original language	English (US)
Pages (from-to)	2215-2227
Number of pages	13
Journal	Geochimica et Cosmochimica Acta
Volume	52
Issue number	9
DOIs	https://doi.org/10.1016/0016-7037(88)90124-X
State	Published - Sep 1988
Externally published	Yes

ASJC Scopus subject areas

Geochemistry and Petrology

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10.1016/0016-7037(88)90124-X

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title = "Iodine-xenon studies of Allende inclusions: Eggs and the Pink Angel",

abstract = "The iodine-xenon systems of six Allende inclusions (five Eggs and the Pink Angel) appear to have been altered by non-nebular secondary processes. Evidence for this includes temperature-ordered variations in the initial I isotopic composition within several objects (with older apparent I-Xe ages associated with higher extraction temperatures) and the absence of primitive I-Xe ages. The span of apparent ages seen in Allende objects (10 Ma or more) is probably too long to reflect any nebular process, so at least some alteration probably occurred on the parent body. The range in initial 244Pu 238U ratios for the Eggs (3-14 × 10-3) includes the current best estimates of the bulk solar system value (4-7 × 10-3). For Egg 3, the Pu U ratio varies by a factor of two between extractions, probably the result of fractionation of Pu from U among different phases.",

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T1 - Iodine-xenon studies of Allende inclusions

T2 - Eggs and the Pink Angel

AU - Swindle, T. D.

AU - Caffee, M. W.

AU - Hohenberg, C. M.

PY - 1988/9

Y1 - 1988/9

N2 - The iodine-xenon systems of six Allende inclusions (five Eggs and the Pink Angel) appear to have been altered by non-nebular secondary processes. Evidence for this includes temperature-ordered variations in the initial I isotopic composition within several objects (with older apparent I-Xe ages associated with higher extraction temperatures) and the absence of primitive I-Xe ages. The span of apparent ages seen in Allende objects (10 Ma or more) is probably too long to reflect any nebular process, so at least some alteration probably occurred on the parent body. The range in initial 244Pu 238U ratios for the Eggs (3-14 × 10-3) includes the current best estimates of the bulk solar system value (4-7 × 10-3). For Egg 3, the Pu U ratio varies by a factor of two between extractions, probably the result of fractionation of Pu from U among different phases.

AB - The iodine-xenon systems of six Allende inclusions (five Eggs and the Pink Angel) appear to have been altered by non-nebular secondary processes. Evidence for this includes temperature-ordered variations in the initial I isotopic composition within several objects (with older apparent I-Xe ages associated with higher extraction temperatures) and the absence of primitive I-Xe ages. The span of apparent ages seen in Allende objects (10 Ma or more) is probably too long to reflect any nebular process, so at least some alteration probably occurred on the parent body. The range in initial 244Pu 238U ratios for the Eggs (3-14 × 10-3) includes the current best estimates of the bulk solar system value (4-7 × 10-3). For Egg 3, the Pu U ratio varies by a factor of two between extractions, probably the result of fractionation of Pu from U among different phases.

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Iodine-xenon studies of Allende inclusions: Eggs and the Pink Angel

Abstract

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