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Heating events in the nascent solar system recorded by rare earth element isotopic fractionation in refractory inclusions

Journal Article · · Science Advances
 [1];  [1];  [2];  [3];  [4];  [1];  [3];  [3];  [3];  [5];  [6];  [7];  [7];  [7]
  1. Univ. of Chicago, IL (United States). Origins Lab.; Univ. of Chicago, IL (United States). Enrico Fermi Inst., Chicago Center for Cosmochemistry
  2. Univ. of Chicago, IL (United States). Origins Lab.; California Institute of Technology (CalTech), Pasadena, CA (United States). The Isotoparium
  3. Univ. of Chicago, IL (United States). Enrico Fermi Inst., Chicago Center for Cosmochemistry
  4. Univ. of Chicago, IL (United States). Origins Lab.; Univ. of Chicago, IL (United States). Enrico Fermi Inst., Chicago Center for Cosmochemistry; Boston Univ., MA (United States)
  5. Victoria Univ. of Wellington (New Zealand)
  6. Univ. Pierre et Marie Curie, Paris (France). IMPMC, CNRS, UMR, Museum National d'Histoire Naturelle
  7. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Equilibrium condensation of solar gas is often invoked to explain the abundance of refractory elements in planets and meteorites. This is partly motivated, by the observation that the depletions in both the least and most refractory rare earth elements (REEs) in meteoritic group II calcium-aluminum–rich inclusions (CAIs) can be reproduced by thermodynamic models of solar nebula condensation. We measured the isotopic compositions of Ce, Nd, Sm, Eu, Gd, Dy, Er, and Yb in eight CAIs to test this scenario. Contrary to expectation for equilibrium condensation, we find light isotope enrichment for the most refractory REEs and more subdued isotopic variations for the least refractory REEs. This suggests that group II CAIs formed by a two-stage process involving fast evaporation of preexisting materials, followed by near-equilibrium recondensation. The calculated time scales are consistent with heating in events akin to FU Orionis– or EX Lupi–type outbursts of eruptive pre–main-sequence stars.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1775491
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 2 Vol. 7; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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