Predominantly non-solar origin of nitrogen in lunar soils.
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| Title: | Predominantly non-solar origin of nitrogen in lunar soils. |
|---|---|
| Authors: | Mortimer, J.1, Verchovsky, A.B.1, Anand, M.1,2 Mahesh.Anand@open.ac.uk |
| Source: | Geochimica et Cosmochimica Acta. Nov2016, Vol. 193, p36-53. 18p. |
| Subjects: | Lunar soil, Nitrogen in soils, Mass spectrometry, Solar wind, Temperature measurements, Combustion |
| Abstract: | Simultaneous static-mode mass spectrometric measurements of nitrogen, carbon, helium, neon, and argon, extracted from the same aliquot of sample by high-resolution stepped combustion, have been made for a suite of five lunar soils. Noble gas isotope ratios show that the majority of noble gases are derived from a solar wind source; for example, at peak release temperatures of 500–600 °C, 21 Ne/ 22 Ne = 0.0313 ± 0.0007 to 0.0333 ± 0.0007, and 20 Ne/ 22 Ne = 11.48 ± 0.05 to 12.43 ± 0.07, with values at the lowest temperature steps less fractionated during implantation from, and therefore even closer to, solar values ( 21 Ne/ 22 Ne SW = 0.03361 ± 0.00018 and 20 Ne/ 22 Ne SW = 14.001 ± 0.042 ( Pepin et al., 2012 )). Despite the co-release of nitrogen and solar wind argon, measured nitrogen isotopic signatures at each temperature step, whilst variable, are significantly more enriched in 15 N compared to the measured solar wind nitrogen value from the Genesis mission. Therefore, mixing between a 15 N-enriched non-solar planetary nitrogen source with solar wind nitrogen is required to explain the measured isotopic values from the stepped combustion analysis of lunar soils. Binary mixing calculations, made under different assumptions about the degree of loss of solar wind 36 Ar, reveal that the majority (up to 98%) of the nitrogen released is derived from a non-solar source. The range of modelled non-solar end-member nitrogen compositions required to satisfy the measured δ 15 N values varies between samples and temperature steps from +5‰ up to +300‰, or between +87‰ and +160‰ for bulk samples. This range of modelled isotopic compositions for the non-solar source of nitrogen encompasses measured values for several different groups of carbonaceous chondrite, as well as IDPs. [ABSTRACT FROM AUTHOR] |
| Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Items | – Name: Title Label: Title Group: Ti Data: Predominantly non-solar origin of nitrogen in lunar soils. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mortimer%2C+J%2E%22">Mortimer, J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Verchovsky%2C+A%2EB%2E%22">Verchovsky, A.B.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Anand%2C+M%2E%22">Anand, M.</searchLink><relatesTo>1,2</relatesTo><i> Mahesh.Anand@open.ac.uk</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Nov2016, Vol. 193, p36-53. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Lunar+soil%22">Lunar soil</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrogen+in+soils%22">Nitrogen in soils</searchLink><br /><searchLink fieldCode="DE" term="%22Mass+spectrometry%22">Mass spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+wind%22">Solar wind</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+measurements%22">Temperature measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Combustion%22">Combustion</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Simultaneous static-mode mass spectrometric measurements of nitrogen, carbon, helium, neon, and argon, extracted from the same aliquot of sample by high-resolution stepped combustion, have been made for a suite of five lunar soils. Noble gas isotope ratios show that the majority of noble gases are derived from a solar wind source; for example, at peak release temperatures of 500–600 °C, 21 Ne/ 22 Ne = 0.0313 ± 0.0007 to 0.0333 ± 0.0007, and 20 Ne/ 22 Ne = 11.48 ± 0.05 to 12.43 ± 0.07, with values at the lowest temperature steps less fractionated during implantation from, and therefore even closer to, solar values ( 21 Ne/ 22 Ne SW = 0.03361 ± 0.00018 and 20 Ne/ 22 Ne SW = 14.001 ± 0.042 ( Pepin et al., 2012 )). Despite the co-release of nitrogen and solar wind argon, measured nitrogen isotopic signatures at each temperature step, whilst variable, are significantly more enriched in 15 N compared to the measured solar wind nitrogen value from the Genesis mission. Therefore, mixing between a 15 N-enriched non-solar planetary nitrogen source with solar wind nitrogen is required to explain the measured isotopic values from the stepped combustion analysis of lunar soils. Binary mixing calculations, made under different assumptions about the degree of loss of solar wind 36 Ar, reveal that the majority (up to 98%) of the nitrogen released is derived from a non-solar source. The range of modelled non-solar end-member nitrogen compositions required to satisfy the measured δ 15 N values varies between samples and temperature steps from +5‰ up to +300‰, or between +87‰ and +160‰ for bulk samples. This range of modelled isotopic compositions for the non-solar source of nitrogen encompasses measured values for several different groups of carbonaceous chondrite, as well as IDPs. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.gca.2016.08.006 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 36 Subjects: – SubjectFull: Lunar soil Type: general – SubjectFull: Nitrogen in soils Type: general – SubjectFull: Mass spectrometry Type: general – SubjectFull: Solar wind Type: general – SubjectFull: Temperature measurements Type: general – SubjectFull: Combustion Type: general Titles: – TitleFull: Predominantly non-solar origin of nitrogen in lunar soils. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mortimer, J. – PersonEntity: Name: NameFull: Verchovsky, A.B. – PersonEntity: Name: NameFull: Anand, M. IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 11 Text: Nov2016 Type: published Y: 2016 Identifiers: – Type: issn-print Value: 00167037 Numbering: – Type: volume Value: 193 Titles: – TitleFull: Geochimica et Cosmochimica Acta Type: main |
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