Trevorite: Ni-rich spinel formed by metasomatism and desulfurization processes at Bon Accord, South Africa?
Clay, Patricia L.
Cawthorn, R. Grant
University of Manchester
University of the Witwatersrand
University of Derby
University of Göttingen
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AbstractThe 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.
CitationO'Driscoll, B. et al (2014) 'Trevorite: Ni-rich spinel formed by metasomatism and desulfurization processes at Bon Accord, South Africa?', Mineralogical Magazine, 78 (1):145.