Early differentiation of magmatic iron meteorite parent bodies from Mn–Cr chronometry

Anand, A.; Pape, J.; Wille, M.; Mezger, K.; Hofmann, B. (2021). Early differentiation of magmatic iron meteorite parent bodies from Mn–Cr chronometry. Geochemical perspectives letters, 20, pp. 6-10. European Association of Geochemistry 10.7185/geochemlet.2136

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Magmatic iron meteorite groups such as IIAB, IIIAB and IVA, represent the largest sampling of extraterrestrial core material from the earliest accreted distinct planetary bodies in the solar system. Chromium isotope compositions of chromite/daubréelite from seven samples, translated into 53Cr/52Cr model ages, provide robust time information on planetary core formation. These ages are within ∼1.5 Ma after formation of calcium-aluminium-rich inclusions (CAIs) and define the time of metal core formation in the respective parent bodies, assuming metal–silicate separation was an instantaneous event that induced strong chemical fractionation of Mn from the more siderophile Cr. The early core formation ages support accretion and differentiation of the magmatic iron meteorite parent bodies to have occurred prior to the chondrule formation interval. The calibration of Mn–Cr ages with established Hf–W ages of samples from the same magmatic iron meteorite groups constrains the initial ɛ53Cr of the solar system to −0.30 ± 0.05, and thus lower than previously estimated.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences

UniBE Contributor:

Anand, Aryavart; Pape, Jonas; Wille, Martin; Mezger, Klaus and Hofmann, Beda Anton

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

2410-339X

Publisher:

European Association of Geochemistry

Language:

English

Submitter:

Beda Anton Hofmann

Date Deposited:

30 Mar 2022 14:17

Last Modified:

30 Mar 2022 14:26

Publisher DOI:

10.7185/geochemlet.2136

BORIS DOI:

10.48350/168190

URI:

https://boris.unibe.ch/id/eprint/168190

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