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Fossil records of early solar irradiation and cosmolocation of the CAI factory: A reappraisal

Bekaert, David V. and Auro, Maureen and Shollenberger, Quinn R. and Liu, Ming-Chang and Marschall, Horst and Burton, Kevin W. and Jacobsen, Benjamin and Brennecka, Gregory A. and McPherson, Glenn J. and von Mutius, Richard and Sarafian, Adam and Nielsen, Sune G. (2021) 'Fossil records of early solar irradiation and cosmolocation of the CAI factory: A reappraisal.', Science Advances, 7 (40). eabg8329.


Calcium-aluminum–rich inclusions (CAIs) in meteorites carry crucial information about the environmental conditions of the nascent Solar System prior to planet formation. Based on models of 50V–10Be co-production by in-situ irradiation, CAIs are considered to have formed within ~0.1 AU from the proto-Sun. Here, we present vanadium (V) and strontium (Sr) isotopic co-variations in fine- and coarse-grained CAIs and demonstrate that kinetic isotope effects during partial condensation and evaporation best explain V isotope anomalies previously attributed to solar particle irradiation. We also report initial excesses of 10Be and argue that CV CAIs possess essentially a homogeneous level of 10Be, inherited during their formation. Based on numerical modeling of 50V–10Be co-production by irradiation, we show that CAI formation during protoplanetary disk build-up likely occurred at greater heliocentric distances than previously considered, up to planet-forming regions (~1AU), where solar particle fluxes were sufficiently low to avoid substantial in-situ irradiation of CAIs.

Item Type:Article
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Available under License - Creative Commons Attribution Non-commercial 4.0.
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Publisher statement:Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S.Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Date accepted:No date available
Date deposited:04 October 2021
Date of first online publication:29 September 2021
Date first made open access:04 October 2021

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