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Pre-Klondikean oxidation prepared the ground for Broken Hill-type mineralization in South Africa

Höhn, Stefan
Frimmel, Hartwig E.ORCIDiD
Debaille, VincianeORCIDiD
Price, Westley
DOI: https://doi.org/10.1111/ter.12502
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/8787
Höhn, Stefan; Frimmel, Hartwig E.; Debaille, Vinciane; Price, Westley, 2020: Pre-Klondikean oxidation prepared the ground for Broken Hill-type mineralization in South Africa. In: Terra Nova, DOI: 10.1111/ter.12502.
 
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  • Abstract
New Cu isotope data obtained on chalcopyrite from the Black Mountain and the Broken Hill deposits in the medium- to high-grade metamorphic Aggeneys-Gamsberg ore district (South Africa) require a revision of our understanding of the genesis of metamorphic Broken Hill-type massive sulphide deposits. Chalcopyrite from both deposits revealed unusually wide ranges in δ65Cu (−2.41 to 2.84‰ NIST 976 standard) in combination with distinctly positive mean values (0.27 and 0.94‰, respectively). This is interpreted to reflect derivation from various silicate and oxide precursor minerals in which Cu occurred in higher oxidation states. Together with the observation of a typical supergene base metal distribution within the deposits and their spatial association with an unconformity only meters above the ore horizon, our new data are best explained by supergene oxidation of originally possibly SEDEX deposits prior to metamorphic sulphide formation, between the Okiepian (1,210–1,180 Ma) and Klondikean (1,040–1,020 Ma) orogenic events.
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  • Geochemie, Mineralogie, Petrologie [395]
Subjects:
chalcopyrite
Cu isotope data
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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