Trevorite: Ni-rich spinel formed by metasomatism and desulfurization processes at Bon Accord, South Africa?
Journal article
Authors | O'Driscoll, Brian, Clay, Patricia L., Cawthorn, R. Grant, Lenaz, Davide, Adetunji, Jacob and Kronz, Andreas |
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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. |
Keywords | Bon accord; Desulfursization; Metasomatism; South Africa; Spinel; Trevorite |
Year | 2014 |
Journal | Mineralogical Magazine |
Publisher | Mineralogical Society |
ISSN | 0026461X |
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 dates | 01 Feb 2014 |
Publication process dates | |
Deposited | 02 May 2017, 15:22 |
Rights | Archived with thanks to Mineralogical Magazine |
Contributors | Keele University, University of Manchester, University of the Witwatersrand, Trieste University, University of Derby and University of Göttingen |
File | File Access Level Open |
https://repository.derby.ac.uk/item/92545/trevorite-ni-rich-spinel-formed-by-metasomatism-and-desulfurization-processes-at-bon-accord-south-africa
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