An improved model of metal/silicate differentiation during Earth's accretion

Title data

Dale, K. I. ; Rubie, David C. ; Nakajima, M. ; Jacobson, S. ; Nathan, G. ; Golabek, Gregor J. ; Cambioni, S. ; Morbidelli, A.:
An improved model of metal/silicate differentiation during Earth's accretion.
In: Icarus. Vol. 406 (2023) . - 115739.
ISSN 0019-1035
DOI: https://doi.org/10.1016/j.icarus.2023.115739

Official URL:

Abstract in another language

We improved the algorithm presented in Rubie et al. (2015) to model the chemical evolution of Earth driven by iron/silicate differentiation during the planet's accretion. The pressure at which the equilibration occurs during a giant impact is no longer a free parameter but is determined by the smooth particle hydrodynamic (SPH) simulations of Nakajima et al. (2021). Moreover, impacting planetesimals are now assumed to be too small to cause melting and differentiation and thus their materials are stored in the crystalline upper mantle of the growing planet until a hydrostatically relaxed global magma ocean forms in the aftermath of a giant impact, whose depth is also estimated from Nakajima et al. (2021). With these changes, not all dynamical simulations lead to a satisfactory reproduction of the chemical composition of the bulk silicate Earth (BSE). Thus, the latter becomes diagnostic of the success of dynamical models. In the successful cases also the BSE abundances of W and Mo can be reproduced, that were previously hard to fit (Jennings et al., 2021).

Further data

Item Type:	Article in a journal
Refereed:	Yes
Keywords:	Cosmochemistry; Interior abundances; Planet formation
Institutions of the University:	Research Institutions > Central research institutes > Bavarian Research Institute of Experimental Geochemistry and Geophysics - BGI Research Institutions Research Institutions > Central research institutes
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 550 Earth sciences, geology
Date Deposited:	14 Oct 2024 07:40
Last Modified:	14 Oct 2024 07:40
URI:	https://eref.uni-bayreuth.de/id/eprint/90652