Palme, Herbert; Mezger, Klaus (2024). Nucleosynthetic isotope variations in chondritic meteorites and their relationship to bulk chemistry. Meteoritics & planetary science, 59(2), pp. 382-394. Wiley 10.1111/maps.14127
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Meteorit_Planetary_Scien_-_2024_-_Palme_-_Nucleosynthetic_isotope_variations_in_chondritic_meteorites_and_their.pdf - Published Version Restricted to registered users only Available under License Publisher holds Copyright. Download (772kB) | Request a copy |
The relationship of mass-independent stable isotope anomalies with the chemistry of chondritic meteorites provides constraints on mixing and fractionation processes in the early solar nebula. The present study emphasizes the strong correlation of nucleosynthetic isotope variations among ordinary chondrites (OC), enstatite chondrites (EC), Earth, CI-chondrites, and Ca, Al-rich inclusions (CAI) in ε50Ti versus ε54Cr space. This correlation indicates variable contamination of chondritic reservoirs with material from a single source providing neutron-rich nuclei such as 50Ti, 54Cr, and 62Ni. The well-defined linear relationship of ε50Ti versus ε54Cr indicates that all reservoirs on the correlation line (“chondrite reference line”) started with a CI-chondritic (solar) Cr/Ti ratio, irrespective of the present Cr/Ti ratio of the samples falling on the chondrite reference line. The isotope compositions of carbonaceous chondrites (CC) do not fit the chondrite reference line. Their isotope composition is consistent with a mixture of chondritic meteorites originally falling on the chondrite reference line and volatile element depleted CAIs. However, CC cannot result from addition of CAIs to OC or EC. Neither can OC and EC be produced by loss of refractory components from CI-meteorites. Also, stable isotopes are inconsistent with OC being derived from EC, and vice versa, by a chemical fractionation process. The enrichment of the Earth in refractory lithophile elements is not the result of addition of a refractory component to a chondritic reservoir. It is rather the result of internal fractionation of a chondritic reservoir.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Institute of Geological Sciences 08 Faculty of Science > Other Institutions > Emeriti, Faculty of Science 10 Strategic Research Centers > Center for Space and Habitability (CSH) |
UniBE Contributor: |
Mezger, Klaus |
Subjects: |
000 Computer science, knowledge & systems 500 Science > 550 Earth sciences & geology |
ISSN: |
1945-5100 |
Publisher: |
Wiley |
Language: |
English |
Submitter: |
Klaus Mezger |
Date Deposited: |
14 Mar 2024 10:59 |
Last Modified: |
14 Mar 2024 11:08 |
Publisher DOI: |
10.1111/maps.14127 |
BORIS DOI: |
10.48350/193979 |
URI: |
https://boris.unibe.ch/id/eprint/193979 |
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