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

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Year:
2014
Type of Publication:
Article
Authors:
O', B.; Driscoll, ; Clay, P. L.; Cawthorn, R. G.; Lenaz, D.; Adetunji, J.; Kronz, Andreas
Journal:
Mineralogical Magazine
Volume:
78
Number:
1
Pages:
145-163
BibTex:
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.

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