Trevorite: Ni-rich spinel formed by metasomatism and desulfurization processes at Bon Accord, South Africa?

Journal article

O'Driscoll, Brian, Clay, Patricia L., Cawthorn, R. Grant, Lenaz, Davide, Adetunji, Jacob and Kronz, Andreas 2014. Trevorite: Ni-rich spinel formed by metasomatism and desulfurization processes at Bon Accord, South Africa? Mineralogical Magazine. https://doi.org/10.1180/minmag.2014.078.1.11
AuthorsO'Driscoll, Brian, Clay, Patricia L., Cawthorn, R. Grant, Lenaz, Davide, Adetunji, Jacob and Kronz, Andreas
Abstract

The 3.5 Ga Bon Accord Ni deposit occurs within the lowest serpentinized mafic ultramafic lavas of the Barberton Greenstone Belt (South Africa). Though now completely mined out, it comprised a suite of rare Ni-rich minerals that led to its interpretation as either an extraterrestrial body or as an oxidized fragment of Fe-Ni alloy originating from the terrestrial core. In this study, we draw on detailed petrographic observation and mineral chemical data, as well as previous work, to re-evaluate these ideas. The balance of evidence, from thin section (<1 mm) to regional (∼10s of km) scales, appears to support an alternative origin for Bon Accord, possibly as an oxidized Ni-sulfide deposit formed in association with ocean floor komatiite eruptions.

KeywordsBon accord; Desulfursization; Metasomatism; South Africa; Spinel; Trevorite
Year2014
JournalMineralogical Magazine
PublisherMineralogical Society
ISSN0026461X
14718022
Digital Object Identifier (DOI)https://doi.org/10.1180/minmag.2014.078.1.11
Web address (URL)http://hdl.handle.net/10545/621579
hdl:10545/621579
Publication dates01 Feb 2014
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Deposited02 May 2017, 15:22
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Archived with thanks to Mineralogical Magazine

ContributorsKeele University, University of Manchester, University of the Witwatersrand, Trieste University, University of Derby and University of Göttingen
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