Isotopic constraints on genetic relationships among group IIIF iron meteorites, Fitzwater Pass, and the Zinder pallasite

Author:

Pape Jonas1ORCID,Zhang Bidong2ORCID,Spitzer Fridolin3ORCID,Rubin Alan E.2ORCID,Kleine Thorsten3ORCID

Affiliation:

1. Institut für Planetologie University of Münster Münster Germany

2. Department of Earth, Planetary & Space Sciences University of California Los Angeles California USA

3. Max Planck Institute for Solar System Research Göttingen Germany

Abstract

AbstractComplex interelement trends among magmatic IIIF iron meteorites are difficult to explain by fractional crystallization and have raised uncertainty about their genetic relationships. Nucleosynthetic Mo isotope anomalies provide a powerful tool to assess if individual IIIF irons are related to each other. However, while trace element data are available for all nine IIIF irons, Mo isotopic data are limited to three samples. We present Mo isotopic data for all but one IIIF irons that help assess the genetic relationships among these irons, together with new Mo and W isotopic data for Fitzwater Pass (classified IIIF), and the Zinder pallasite (for which a cogenetic link with IIIF irons has been proposed). After correction for cosmic‐ray exposure, the Mo isotopic compositions of the IIIF irons are identical within uncertainty and confirm their belonging to carbonaceous chondrite (CC)‐type meteorites. The mean Mo isotopic composition of group IIIF overlaps those groups IIF and IID, but a common parent body for these groups is ruled out based on distinct trace element systematics. The new Mo isotopic data do not argue against a single parent body for the IIIF irons, and suggest a close genetic link among these samples. In contrast, Fitzwater Pass has distinct Mo and W isotopic compositions, identical to those of some non‐magmatic IAB irons. The Mo and W isotope data for Zinder indicate that this meteorite is not related to IIIF irons, but belongs to the non‐carbonaceous (NC) type and has the same Mo and W isotopic composition as main‐group pallasites.

Funder

Ames Research Center

Deutsche Forschungsgemeinschaft

Publisher

Wiley

Subject

Space and Planetary Science,Geophysics

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Geochemistry of pallasite olivine and the origin of pallasites;Geochimica et Cosmochimica Acta;2024-10

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