Trevorite: Ni-rich spinel formed by metasomatism and desulfurization processes at Bon Accord, South Africa?
|Authors||O'Driscoll, Brian, Clay, Patricia L., Cawthorn, R. Grant, Lenaz, Davide, Adetunji, Jacob and Kronz, Andreas|
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|
|Digital Object Identifier (DOI)||https://doi.org/10.1180/minmag.2014.078.1.11|
|Web address (URL)||http://hdl.handle.net/10545/621579|
|Publication dates||01 Feb 2014|
|Publication process dates|
|Deposited||02 May 2017, 15:22|
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|
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