Silicon isotope homogeneity in the mantle

Savage, P. S. and Georg, R. B. and Armytage, R. M. G. and Williams, H. M. and Halliday, A. N. (2010) Silicon isotope homogeneity in the mantle. Earth and Planetary Science Letters, 295 (1-2). pp. 139-146. ISSN 0012-821X DOI 10.1016/j.epsl.2010.03.035

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Abstract

Thirty-five mafic and ultramafic rocks have been analysed for their silicon isotopic composition to very high precision with the aim of providing a robust average value for the silicate earth. This is of importance to studies using the difference between meteorite and terrestrial isotope composition to quantify silicon sequestration during core formation and, also, for understanding crustal processes. The δ30Si values of the samples are more limited than previously reported, ranging between just -0.39 and -0.23 despite significant variations in chemical and other isotopic compositions. A hint of a trend exists between δ30Si and both SiO2 and Al2O3, which can be explained by concentration of the heavier isotopes in the melt as a function of silica polymerisation. Our best estimate for the δ30Si of the bulk silicate earth (BSE) is -0.29±0.08 (2 s.d.). © 2010 Elsevier B.V.

Item Type:	Article
Uncontrolled Keywords:	NILAREP
Subjects:	05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions:	05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Journal or Publication Title:	Earth and Planetary Science Letters
Volume:	295
Page Range:	pp. 139-146
Identification Number:	10.1016/j.epsl.2010.03.035
Depositing User:	Sarah Humbert
Date Deposited:	19 Jul 2016 12:37
Last Modified:	19 Jul 2016 12:37
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3692

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