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

  • 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.

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Author:David V. BekaertORCiD, Maureen AuroORCiD, Quinn R. ShollenbergerORCiDGND, Ming-Chang LiuORCiDGND, Horst MarschallORCiDGND, Kevin W. BurtonORCiD, Benjamin JacobsenORCiD, Gregory A. BrenneckaORCiD, Glenn J. MacPhersonORCiDGND, Richard von Mutius, Adam SarafianORCiD, Sune G. NielsenORCiDGND
Parent Title (English):Science Advances
Publisher:American Association for the Advancement of Science
Place of publication:Washington, DC [u.a.]
Document Type:Article
Date of Publication (online):2021/09/29
Date of first Publication:2021/09/29
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2023/09/18
Issue:40, art. eabg8329
Article Number:eabg8329
Page Number:17
Institutes:Geowissenschaften / Geographie / Geowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften
Licence (German):License LogoCreative Commons - CC BY-NC - Namensnennung - Nicht kommerziell 4.0 International