Ruthenium isotope fractionation in protoplanetary cores.
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| Title: | Ruthenium isotope fractionation in protoplanetary cores. |
|---|---|
| Authors: | Hopp, Timo1 timo.hopp@wwu.de, Fischer-Gödde, Mario1, Kleine, Thorsten1 |
| Source: | Geochimica et Cosmochimica Acta. Feb2018, Vol. 223, p75-89. 15p. |
| Subjects: | Ruthenium isotopes, Iron meteorites, Crystallization, Chemical purification, Siderophile elements |
| Abstract: | Mass-dependent Ru isotope variations (δ 102/99 Ru) and Ru concentrations were determined for 35 magmatic iron meteorites from the five major chemical groups (IIAB, IID, IIIAB, IVA, IVB). In addition, four equilibrated ordinary chondrites were analyzed. The IIAB, IIIAB and IVB iron meteorites display increasingly heavier Ru isotopic compositions with decreasing Ru content. Modeling demonstrates that the trends for these three iron groups can be reproduced by the incremental extraction of isotopically lighter Ru into solids, which leads to progressively heavier δ 102/99 Ru in the remaining melt. The modeling further shows that the Ru isotopic variations of the IIAB and IIIAB irons are consistent with derivation from parental melts with an ordinary chondrite-like δ 102/99 Ru, whereas the IVB irons more likely derive from a melt with heavier δ 102/99 Ru. This heavy Ru isotopic composition of the IVB parental melt probably results from high-temperature processing of the IVB precursor material. The Ru isotope systematics of the IID and IVA irons are more complex and show no correlation between δ 102/99 Ru and Ru content. Although most samples exhibit heavy Ru isotopic compositions, especially the late-crystallized irons of these groups deviate from the expected fractional crystallization trends. This deviation most likely results from mixing and re-equilibration of early-crystallized solids and late-stage liquids, followed by further fractional crystallization. The mixing might be related to the migration of liquids through a complex network of dendrites or to the overturn of a cumulate inner core, and bears testimony to the complex solidification history of at least some protoplanetary cores. [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: 127469778 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Ruthenium isotope fractionation in protoplanetary cores. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hopp%2C+Timo%22">Hopp, Timo</searchLink><relatesTo>1</relatesTo><i> timo.hopp@wwu.de</i><br /><searchLink fieldCode="AR" term="%22Fischer-Gödde%2C+Mario%22">Fischer-Gödde, Mario</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kleine%2C+Thorsten%22">Kleine, Thorsten</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Feb2018, Vol. 223, p75-89. 15p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Ruthenium+isotopes%22">Ruthenium isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Iron+meteorites%22">Iron meteorites</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallization%22">Crystallization</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+purification%22">Chemical purification</searchLink><br /><searchLink fieldCode="DE" term="%22Siderophile+elements%22">Siderophile elements</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Mass-dependent Ru isotope variations (δ 102/99 Ru) and Ru concentrations were determined for 35 magmatic iron meteorites from the five major chemical groups (IIAB, IID, IIIAB, IVA, IVB). In addition, four equilibrated ordinary chondrites were analyzed. The IIAB, IIIAB and IVB iron meteorites display increasingly heavier Ru isotopic compositions with decreasing Ru content. Modeling demonstrates that the trends for these three iron groups can be reproduced by the incremental extraction of isotopically lighter Ru into solids, which leads to progressively heavier δ 102/99 Ru in the remaining melt. The modeling further shows that the Ru isotopic variations of the IIAB and IIIAB irons are consistent with derivation from parental melts with an ordinary chondrite-like δ 102/99 Ru, whereas the IVB irons more likely derive from a melt with heavier δ 102/99 Ru. This heavy Ru isotopic composition of the IVB parental melt probably results from high-temperature processing of the IVB precursor material. The Ru isotope systematics of the IID and IVA irons are more complex and show no correlation between δ 102/99 Ru and Ru content. Although most samples exhibit heavy Ru isotopic compositions, especially the late-crystallized irons of these groups deviate from the expected fractional crystallization trends. This deviation most likely results from mixing and re-equilibration of early-crystallized solids and late-stage liquids, followed by further fractional crystallization. The mixing might be related to the migration of liquids through a complex network of dendrites or to the overturn of a cumulate inner core, and bears testimony to the complex solidification history of at least some protoplanetary cores. [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.2017.11.033 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: 75 Subjects: – SubjectFull: Ruthenium isotopes Type: general – SubjectFull: Iron meteorites Type: general – SubjectFull: Crystallization Type: general – SubjectFull: Chemical purification Type: general – SubjectFull: Siderophile elements Type: general Titles: – TitleFull: Ruthenium isotope fractionation in protoplanetary cores. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hopp, Timo – PersonEntity: Name: NameFull: Fischer-Gödde, Mario – PersonEntity: Name: NameFull: Kleine, Thorsten IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 02 Text: Feb2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 00167037 Numbering: – Type: volume Value: 223 Titles: – TitleFull: Geochimica et Cosmochimica Acta Type: main |
| ResultId | 1 |
