Chemically fractionated fission-xenon in meteorites and on the earth

Shukolyukov, Y.A.; Jeßberger, E. K.; Meshik, A. P.; Minh, Dang Vu; Jordan, J.

doi:10.1016/0016-7037(94)90180-5

Cited by 7 publications

(5 citation statements)

References 23 publications

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“…There are several publications by Gerling and later by Shukolyukov and coauthors (mostly in Russian), who developed the Xe isotope geochemistry. For instance, Shukolyukov et al 80 found that migration of short-lived precursors of Xe isotopes (these include isotopes of Sn, Sb, Te and I) produced by the 235 U fission in the natural nuclear reactor Oklo (Gabon) resulted in anomalous isotope composition of Xe remaining there in uranium minerals. As one of the precursors, 129 I is intermediate-lived (about 17 Ma y), it was hypothesised (in the 1980s and 1990s) that migration of the 129 I -the precursor of 129 Xe -might have resulted in some isotope peculiarities of Xe on the early Earth.…”

Section: Applications In Earth and Geosciences Paleoclimate Researchmentioning

confidence: 98%

“…The isotopic composition depends on the chemical composition of the irradiated material and also on the shielding depth. In meteorites and lunar soil, neutron capture by Br and I can result in additional 80 Kr, 82 Kr and 128 Xe.…”

Section: Cosmogenic (Spallogenic) Componentsmentioning

confidence: 99%

“…As one of the precursors, 129 I is intermediate-lived (about 17 Ma y), it was hypothesised (in the 1980s and 1990s) that migration of the 129 I -the precursor of 129 Xe -might have resulted in some isotope peculiarities of Xe on the early Earth. 80 Hydrology and Palaeoclimate Research Noble gases have been widely used as tracers for the origin and the transport of fluids as they are chemically inert and volatile (thus a having strong tendency to partition between phases). Noble gases were applied, e.g.…”

Section: Applications In Earth and Geosciences Paleoclimate Researchmentioning

confidence: 99%

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Gas Source Isotope Ratio Mass Spectrometry for the Analysis of Noble Gases

Assonov

Prohaska

2014

Sector Field Mass Spectrometry for Elemental and Isotopic Analysis

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Geological processes result in redistribution of noble gases on Earth, with some isotopes being accumulated due to radioactive decay and cosmic irradiation. Therefore noble gas isotope and concentration ratios can be used as tracers of geological processes and geologic age. Analytical techniques for measuring noble gases are complex and differ substantially from the techniques used for stable isotopes. This chapter describes the historical development of noble gas isotope ratio mass spectrometry, sampling requirements, noble gas extraction techniques and sample gas purification and also gives the overview of modern commercially available instruments. Next the referencing strategy and calibration approaches are considered. The only international reference for noble gas isotope ratios is the Earth atmosphere reservoir – an artifact-based scale. In contrast to stable isotopes, noble gas applications require not only relative determinations vs. the international scale but mostly numerical values of isotope and elemental ratios. Up to date many publications refer to the noble gas isotope ratios determined in 1940s. Since then several re-determinations have been reported, being mostly based on commercially available noble gases. Unsolved discrepancies in the isotope ratios, e.g. for atmospheric Ar imply not well-identified uncertainty component for noble gas data which needs more attention. Finally an overview of applications is given.

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Section: Applications In Earth and Geosciences Paleoclimate Researchmentioning

confidence: 98%

Section: Cosmogenic (Spallogenic) Componentsmentioning

confidence: 99%

Section: Applications In Earth and Geosciences Paleoclimate Researchmentioning

confidence: 99%

See 1 more Smart Citation

Gas Source Isotope Ratio Mass Spectrometry for the Analysis of Noble Gases

Assonov

Prohaska

2014

Sector Field Mass Spectrometry for Elemental and Isotopic Analysis

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“…However, the low inferred value for the trapped component is inconsistent with this interpretation because radioactive decay of 129 I can only increase the 129 Xe/ 132 Xe ratio from some initial solar system value such as Q-xenon with 129 Xe/ 132 Xe = 1.04 (Busemann et al 2000) or solar wind with 129 Xe/ 132 Xe = 1.05 (Wieler and Baur 1994). Other mechanisms affecting the 129 Xe/ 132 Xe ratio such as mass-dependent fractionation or the incorporation of a chemically fractionated fission xenon component (Shukolyukov et al 1994) leave characteristic isotopic signatures that are not observed.…”

Section: Vigarano Caimentioning

confidence: 99%

I‐Xe measurements of CAIs and chondrules from the CV3 chondrites Mokoia and Vigarano

Whitby¹,

Russell²,

Turner³

et al. 2004

Meteorit & Planetary Scien

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Abstract-I-Xe analyses were carried out for chondrules and refractory inclusions from the two CV3 carbonaceous chondrites Mokoia and Vigarano (representing the oxidized and reduced subgroups, respectively). Although some degree of disturbance to the I-Xe system is evident in all of the samples, evidence is preserved of aqueous alteration of CAIs in Mokoia 1 Myr later than the I-Xe age of the Shallowater standard and of the alteration of a chondrule (V3) from Vigarano ~0.7 Myr later than Shallowater. Other chondrules in Mokoia and Vigarano experienced disturbance of the I-Xe system millions of years later and, in the case of one Vigarano chondrule (VS1), complete resetting of the IXe system after decay of essentially all 129 I, corresponding to an age more than 80 Myr after Shallowater. Our interpretation is that accretion and processing to form the Mokoia and Vigarano parent bodies must have continued for at least 4 Myr and 80 Myr, respectively. The late age of a chondrule that shows no evidence for any aqueous alteration or significant thermal processing after its formation leads us to postulate the existence of an energetic chondrule-forming mechanism at a time when nebular processes are not expected to be important.

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“…At low extraction temperatures the apparent fission yields of 131 Xe and 132 Xe showed ~ 10-fold enrichments. A modified version of this experiment included the isotopic analyses of the Xe accumulated in a neutron-irradiated quartz ampoule containing U-oxide powder [3,4]. Here, Xe in the ampoule was found to be enriched in 136 Xe and 134 Xe, complimentarily to the low temperature Xe releases from the irradiated powder itself which was depleted in these isotopes.…”

Section: Introductionmentioning

confidence: 99%

New evidence for chemical fractionation of radioactive xenon precursors in fission chains

2016

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Mass-spectrometric analyses of Xe released from acid-treated U ore reveal that apparent Xe fission yields significantly deviate from the normal values. The anomalous Xe structure is attributed to chemically fractionated fission (CFF), previously observed only in materials experienced neutron bursts. The least retentive CFF-Xe isotopes, 136 Xe and 134 Xe, typically escape in 2:1 proportion. Xe retained in the sample is complimentarily depleted in these isotopes. This nucleochemical process allows understanding of unexplained Xe isotopic structures in several geophysical environments, which include well gasses, ancient anorthosite, some mantle rocks, as well as terrestrial atmosphere. CFF is likely responsible for the isotopic difference in Xe in the Earth's and Martian atmospheres and it is capable of explaining the relationship between two major solar system Xe carriers: the Sun and phase-Q, found in meteorites.

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Chemically fractionated fission-xenon in meteorites and on the earth

Cited by 7 publications

References 23 publications

Gas Source Isotope Ratio Mass Spectrometry for the Analysis of Noble Gases

Gas Source Isotope Ratio Mass Spectrometry for the Analysis of Noble Gases

I‐Xe measurements of CAIs and chondrules from the CV3 chondrites Mokoia and Vigarano

New evidence for chemical fractionation of radioactive xenon precursors in fission chains

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