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Refined composition of Solar Wind xenon delivered by Genesis NASA mission: Comparison with xenon captured by extraterrestrial regolith soils

Meshik, Alex and Pravdivtseva, Olga and Burnett, Donald (2020) Refined composition of Solar Wind xenon delivered by Genesis NASA mission: Comparison with xenon captured by extraterrestrial regolith soils. Geochimica et Cosmochimica Acta, 276 . pp. 289-298. ISSN 0016-7037. https://resolver.caltech.edu/CaltechAUTHORS:20200323-093930814

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Abstract

The Genesis mission captured Solar Wind (SW) and delivered it to Earth for laboratory analyses. Due to advanced mass spectrometric techniques developed specifically for analyses of returned Genesis SW-collectors, SW-oxygen, nitrogen and noble gas isotopes have been successfully measured providing new insights for cosmo- and geochemistry. SW-Xe collected by Genesis is the heaviest and the least abundant SW element analyzed. Here we describe in detail the experimental improvements we made over last 5 years and a latest refined SW-Xe isotopic composition. Combined with earlier, already published SW-Xe analyses, our new results provide the best current estimate for SW-Xe collected by Genesis: ¹³⁶Xe/¹³⁰Xe = 1.818 ± 0.004; ¹³⁴Xe/¹³⁰Xe = 2.242 ± 0.005; ¹³²Xe/¹³⁰Xe = 6.063 ± 0.010; ¹³¹Xe/¹³⁰Xe = 5.010 ± 0.012; ¹²⁹Xe/¹³⁰Xe = 6.314 ± 0.013; ¹²⁸Xe/¹³⁰Xe = 0.510 ± 0.001; ¹²⁶Xe/¹³⁰Xe = 0.0256 ± 0.0004; ¹²⁴Xe/¹³⁰Xe = 0.0292 ± 0.0004 (all errors are 1σ). The achieved precision allows resolving small, but now statistically significant isotopic difference between solar wind Xe and Xe trapped in lunar regolith samples. This emerging difference, not apparent prior to this study, likely points to the composition of indigenous lunar Xe and to the temporal evolution of terrestrial Xe. Combining our Xe fluence with that for other high first ionization potential (FIP) elements, we find that the depletion of elements with the FIP greater than 12 eV is not constant but monotonically decreases as FIP increases.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.gca.2020.03.001DOIArticle
ORCID:
AuthorORCID
Meshik, Alex0000-0002-9693-833X
Burnett, Donald0000-0001-9521-8675
Additional Information:© 2020 Elsevier Ltd. Received 19 November 2019, Accepted 2 March 2020, Available online 21 March 2020. We are grateful to Judy Allton, Patti Burkett, Wally Calaway, Amy Jurewicz, Karen McNamara, Melissa Rodriguez (Genesis Science team), John Saxton and Phil Freedman (Nu Instruments, now Cameca) for their support. We thank Gregory Herzog, Bernard Marty, Rainer Wieler and an anonymous reviewer for their valuable comments and very helpful suggestions. This work is supported by NASA grant 80NSSC17K0018.
Funders:
Funding AgencyGrant Number
NASA80NSSC17K0018
Record Number:CaltechAUTHORS:20200323-093930814
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200323-093930814
Official Citation:Alex Meshik, Olga Pravdivtseva, Donald Burnett, Refined composition of Solar Wind xenon delivered by Genesis NASA mission: Comparison with xenon captured by extraterrestrial regolith soils, Geochimica et Cosmochimica Acta, Volume 276, 2020, Pages 289-298, ISSN 0016-7037, https://doi.org/10.1016/j.gca.2020.03.001. (http://www.sciencedirect.com/science/article/pii/S0016703720301629)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102042
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Mar 2020 17:13
Last Modified:23 Mar 2020 17:13

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