Mass-independent fractionation of titanium isotopes and its cosmochemical implications
In: EISSN: 2397-3366 ; Nature Astronomy ; https://insu.hal.science/insu-02898345 ; Nature Astronomy, 2020, ⟨10.1038/s41550-020-1043-1⟩, 2020
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International audience ; Isotopes of heavy elements are produced in various amounts by nuclear processes in stars(1,2). Consequently, the presence of isotopic anomalies in the Solar System is considered to reflect the presence of presolar grains condensed in previous generations of stars(3) and not a (proto-) Solar System process. However, for oxygen, the major rock-forming element, it has been shown that physico-chemical reactions applicable to the presolar cloud or the protoplanetary disk were a possible source of isotopic variations due to mass-independent isotopic fractionation (MIF)(4,5). Here we show that MIF effects are not restricted to oxygen, but can also be produced for titanium. Titanium-rich grains experimentally condensed from a TiCl4(g)/C5H12(g) plasma exhibit MIF effects from -25% to +120% for all Ti isotopic ratios. These large Ti isotopic variations follow the model developed for oxygen MIF6 and mimic the Ti isotopic anomalies observed in some presolar grains. This effect is ascribed to the reactions between chemically indistinguishable isotopes(6) and could contribute to the complexity of isotopic anomalies observed in Solar System materials(1,7-14).
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Mass-independent fractionation of titanium isotopes and its cosmochemical implications
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| Autor/in / Beteiligte Person: | Robert, François ; Tartese, Romain ; Lombardi, Guillaume ; Reinhardt, Peter ; Roskosz, Mathieu ; Doisneau, Béatrice ; Deng, Zhengbin ; Chaussidon, Marc ; Institut de minéralogie, de physique des matériaux et de cosmochimie (IMPMC) ; Muséum national d'Histoire naturelle (MNHN)-Institut de recherche pour le développement IRD : UR206-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) ; Univ Manchester, Dept Earth & Environm Sci, Manchester, Lancs, England ; UnivUniv Manchester, Dept Earth & Environm Sci, Manchester, Lancs, England ; Laboratoire de chimie théorique (LCT) ; Institut de Chimie - CNRS Chimie (INC-CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) ; Muséum national d'Histoire naturelle (MNHN) ; Institut de Physique du Globe de Paris (IPGP) ; Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) ; Institut de Physique du Globe de Paris (IPGP (UMR_7154)) ; Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) ; ERC Advanced Grant PaleoNanoLife 161764Science & Technology Facilities Council (STFC)ST/P005225/1UK Research Partnership Investment Funding (UKRPIF) Manchester RPIF Round 2 Henry Royce Institute for Advanced Materials - EPSRC grant EP/R00661X/1EP/P025021/1EP/P025498/1 |
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| Zeitschrift: | EISSN: 2397-3366 ; Nature Astronomy ; https://insu.hal.science/insu-02898345 ; Nature Astronomy, 2020, ⟨10.1038/s41550-020-1043-1⟩, 2020 |
| Veröffentlichung: | HAL CCSD ; Nature Publishing Group, 2020 |
| Medientyp: | academicJournal |
| DOI: | 10.1038/s41550-020-1043-1 |
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