Nickel isotopic composition of the mantle

Gall, Louise and Williams, Helen M. and Halliday, Alex N. and Kerr, Andrew C. (2016) Nickel isotopic composition of the mantle. Geochimica Et Cosmochimica Acta, 199. pp. 196-209. ISSN 0016-7037 DOI https://doi.org/10.1016/j.gca.2016.11.016

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Abstract

This paper presents the first detailed study of Ni isotope variations in mantle rocks of different types and origins. Ultramafic rocks display a relatively large range in δ 60 Ni (permil deviation in 60 Ni/ 58 Ni relative to the NIST SRM 986 Ni isotope standard) from 0.15‰ to 0.36‰, with olivine- rich rocks such as dunite and olivine cumulates showing lighter isotope compositions than komatiite, lherzolite and pyroxenite. In order to understand these variations mineral separates from peridotites xenoliths have also been analysed. Olivine and orthopyroxene mineral separates display light δ 60 Ni whereas clinopyroxene and garnet are isotopically heavy. This indicates that peridotite whole-rock δ 60 Ni are a function of variations in mineralogy, suggesting that melts will have δ 60 Ni that is dominated by variations in residual mantle and cumulate mineralogy. Based on fertile peridotite xenoliths and Phanerozoic komatiite samples it is concluded that the upper mantle has a relatively

Item Type:	Article
Uncontrolled Keywords:	2016AREP; IA71; Bull
Subjects:	05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions:	05 - Petrology - Igneous, Metamorphic and Volcanic Studies 08 - Green Open Access
Journal or Publication Title:	Geochimica Et Cosmochimica Acta
Volume:	199
Page Range:	pp. 196-209
Identification Number:	https://doi.org/10.1016/j.gca.2016.11.016
Depositing User:	Sarah Humbert
Date Deposited:	30 Nov 2016 18:35
Last Modified:	12 Sep 2019 09:38
URI:	http://eprints.esc.cam.ac.uk/id/eprint/3764

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