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

Hu, J. Y. and Dauphas, N. and Tissot, F. L. H. and Yokochi, R. and Ireland, T. J. and Zhang, Z. and Davis, A. M. and Ciesla, F. J. and Grossman, L. and Charlier, B. L. A. and Roskosz, M. and Alp, E. E. and Hu, M. Y. and Zhao, Jiyong (2021) Heating events in the nascent solar system recorded by rare earth element isotopic fractionation in refractory inclusions. Meteoritics and Planetary Science, 56 (S1). Art. No. 105. ISSN 1086-9379. doi:10.1111/maps.13727.

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It is widely accepted that the building blocks of the planets and other inner solar system objects have been vaporized and homogenized at the birth of the solar system. According to this view, solids condensed as the solar nebula cooled, with composition evolving from more refractory phases rich in Ca, Al, and Ti to more volatile phases rich in K and Na. This view has been supported by the observation of the depletions in both the least (Eu, Yb) and most refractory (Gd-Er, Lu) rare earth elements (REEs) in group II calcium-aluminum-rich inclusions (CAIs) [1]. The formation of group II CAIs were thought to represent a snapshot of the condensation sequence, the partial condensate in equilibrium with the solar nebula as it cooled [2,3,4]. However, this view of group II CAI formation was never tested other than through thermodynamic calculations that suffer from large uncertainties due to the paucity of thermodynamic data. To test this paradigm of equilibrium condensation of solar gas, we measured the isotopic compositions of Ce, Nd, Sm, Eu, Gd, Dy, Er, and Yb in 8 CAIs (7 with group II REE patterns). Contrary to expectations for equilibrium condensation, we found significant negative isotopic compositions for the most refractory REEs and more subdued isotopic variations for the least refractory REEs, indicative of disequilibrium formation pathways.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemJournal Article
Hu, J. Y.0000-0002-3705-8148
Dauphas, N.0000-0002-1330-2038
Tissot, F. L. H.0000-0001-6622-2907
Yokochi, R.0000-0002-8756-142X
Ireland, T. J.0000-0001-7617-3889
Davis, A. M.0000-0001-7955-6236
Ciesla, F. J.0000-0002-0093-065X
Charlier, B. L. A.0000-0003-0285-8978
Roskosz, M.0000-0003-1919-5971
Alp, E. E.0000-0002-4803-8863
Hu, M. Y.0000-0002-3718-7169
Zhao, Jiyong0000-0002-0777-3626
Additional Information:© 2021 The Meteoritical Society. Issue Online: 09 August 2021.
Issue or Number:S1
Record Number:CaltechAUTHORS:20211008-203232557
Persistent URL:
Official Citation:(2021), 84th Annual Meeting of the Meteoritical Society (2021). Meteorit Planet Sci, 56: A1-A300.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:111295
Deposited By: Tony Diaz
Deposited On:08 Oct 2021 20:54
Last Modified:16 Nov 2021 19:44

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