Compound– and position–specific carbon isotopic signatures of abiogenic hydrocarbons from on–land serpentinite–hosted Hakuba Happo hot spring in Japan.
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| Title: | Compound– and position–specific carbon isotopic signatures of abiogenic hydrocarbons from on–land serpentinite–hosted Hakuba Happo hot spring in Japan. |
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| Authors: | Suda, Konomi1 suda.konomi@jamstec.go.jp, Gilbert, Alexis2, Yamada, Keita3, Yoshida, Naohiro2,3, Ueno, Yuichiro1,2,4 |
| Source: | Geochimica et Cosmochimica Acta. Jun2017, Vol. 206, p201-215. 15p. |
| Subjects: | Carbon isotopes, Hydrocarbons, Serpentinite, Propane, Hot springs |
| Geographic Terms: | Japan |
| Abstract: | It has been proposed that serpentinite–hosted hydrothermal/hot spring systems played a significant role in the origin and early evolution of life on early Earth because abiogenic synthesis of organic compounds may accompany serpentinization. However, production mechanisms for apparently abiogenic hydrocarbons that have been observed in the ongoing serpentinizing systems are still poorly constrained. We report a new geochemical study of hydrocarbons in an on–land serpentinite–hosted hot spring in Hakuba Happo, Japan. We have conducted both compound–specific and position–specific carbon isotopic analyses of the observed C 1 to C 5 hydrocarbons. A positive linear relationship between the δ 13 C values and the inverse carbon number is found in C 1 to C 5 straight–chain alkanes in the Happo sample. This isotopic trend is consistent with a simple polymerization model developed in this study. Our model assumes that, for any particular alkane, all of the subsequently added carbons have the same isotopic composition, and those are depleted in 13 C with respect to the first carbon in the growing carbon chain. The fit of this model suggests that Happo alkanes can be produced via polymerization from methane with a constant kinetic isotopic fractionation of –8.9 ± 1.0‰. A similar carbon isotopic relationship among alkanes has been observed in some serpentinite–hosted seafloor hydrothermal systems, indicating that the same process is responsible for the abiological hydrocarbon in general serpentinization fields, not only in the Hakuba Happo hot spring. Moreover, our model is also applicable to other potentially abiogenic natural gases and experimentally synthesized hydrocarbon products. For the first time, the intramolecular 13 C composition of propane from a natural sample derived from a serpentinite-hosted system was determined. The intramolecular 13 C distribution in propane shows the important potential to identify different polymerization mechanisms that cannot be discriminated by compound–specific isotopic analysis. [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 |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 122721813 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Compound– and position–specific carbon isotopic signatures of abiogenic hydrocarbons from on–land serpentinite–hosted Hakuba Happo hot spring in Japan. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Suda%2C+Konomi%22">Suda, Konomi</searchLink><relatesTo>1</relatesTo><i> suda.konomi@jamstec.go.jp</i><br /><searchLink fieldCode="AR" term="%22Gilbert%2C+Alexis%22">Gilbert, Alexis</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Yamada%2C+Keita%22">Yamada, Keita</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Yoshida%2C+Naohiro%22">Yoshida, Naohiro</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Ueno%2C+Yuichiro%22">Ueno, Yuichiro</searchLink><relatesTo>1,2,4</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Jun2017, Vol. 206, p201-215. 15p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Carbon+isotopes%22">Carbon isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrocarbons%22">Hydrocarbons</searchLink><br /><searchLink fieldCode="DE" term="%22Serpentinite%22">Serpentinite</searchLink><br /><searchLink fieldCode="DE" term="%22Propane%22">Propane</searchLink><br /><searchLink fieldCode="DE" term="%22Hot+springs%22">Hot springs</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Japan%22">Japan</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: It has been proposed that serpentinite–hosted hydrothermal/hot spring systems played a significant role in the origin and early evolution of life on early Earth because abiogenic synthesis of organic compounds may accompany serpentinization. However, production mechanisms for apparently abiogenic hydrocarbons that have been observed in the ongoing serpentinizing systems are still poorly constrained. We report a new geochemical study of hydrocarbons in an on–land serpentinite–hosted hot spring in Hakuba Happo, Japan. We have conducted both compound–specific and position–specific carbon isotopic analyses of the observed C 1 to C 5 hydrocarbons. A positive linear relationship between the δ 13 C values and the inverse carbon number is found in C 1 to C 5 straight–chain alkanes in the Happo sample. This isotopic trend is consistent with a simple polymerization model developed in this study. Our model assumes that, for any particular alkane, all of the subsequently added carbons have the same isotopic composition, and those are depleted in 13 C with respect to the first carbon in the growing carbon chain. The fit of this model suggests that Happo alkanes can be produced via polymerization from methane with a constant kinetic isotopic fractionation of –8.9 ± 1.0‰. A similar carbon isotopic relationship among alkanes has been observed in some serpentinite–hosted seafloor hydrothermal systems, indicating that the same process is responsible for the abiological hydrocarbon in general serpentinization fields, not only in the Hakuba Happo hot spring. Moreover, our model is also applicable to other potentially abiogenic natural gases and experimentally synthesized hydrocarbon products. For the first time, the intramolecular 13 C composition of propane from a natural sample derived from a serpentinite-hosted system was determined. The intramolecular 13 C distribution in propane shows the important potential to identify different polymerization mechanisms that cannot be discriminated by compound–specific isotopic analysis. [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.2017.03.008 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 201 Subjects: – SubjectFull: Carbon isotopes Type: general – SubjectFull: Hydrocarbons Type: general – SubjectFull: Serpentinite Type: general – SubjectFull: Propane Type: general – SubjectFull: Hot springs Type: general – SubjectFull: Japan Type: general Titles: – TitleFull: Compound– and position–specific carbon isotopic signatures of abiogenic hydrocarbons from on–land serpentinite–hosted Hakuba Happo hot spring in Japan. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Suda, Konomi – PersonEntity: Name: NameFull: Gilbert, Alexis – PersonEntity: Name: NameFull: Yamada, Keita – PersonEntity: Name: NameFull: Yoshida, Naohiro – PersonEntity: Name: NameFull: Ueno, Yuichiro IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 00167037 Numbering: – Type: volume Value: 206 Titles: – TitleFull: Geochimica et Cosmochimica Acta Type: main |
| ResultId | 1 |
