Encyclopedia of Astrobiology

Living Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James Cleaves, Daniele Pinti, José Cernicharo Quintanilla, Michel Viso

Bulk Silicate Earth

Living reference work entry
DOI: https://doi.org/10.1007/978-3-642-27833-4_5237-1

Synonyms

Definition

Bulk Silicate Earth (BSE) refers to the original chemical composition of the silicate part of the Earth after the accretion and separation of a core but prior to differentiation of the first crust. For this reason, BSE is comparable to the composition of the Earth’s “primitive mantle.” There are several models to evaluate the BSE initial composition. The classic model is to infer BSE from the chemical composition of the most primitive, undifferentiated meteorites, i.e., the CI-class carbonaceous chondrites. Using this model, refractory lithophile elements (i.e., those which did not enter the core but remained in the silicate mantle) are given relative abundances as they occur in chondrites. Other models point to differences in ratios of 142Nd/144Nd and 3He/4He between primitive, mantle-derived lavas and chondrites to derive a somewhat different, nonchondritic composition of the primitive mantle.

See Also

Keywords

Relative Abundance Bioorganic Chemistry Classic Model Initial Composition Primitive Mantle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.GEOTOP Research Center for Geochemistry and GeodynamicsUniversité du Québec à MontréalMontréalCanada