| Autor: |
Smith, William, Maghdour-Mashhour, Reza, Hayes, Ben, Thompson, Erin, Holwell, David A., Lloyd, Andy, Brooksby, Kiara C., Hughes, Hannah S. R., Andersen, Jens C. Ø., Lloyd, Andy A., Du Preez, Lara, Acheampong, Kofi, Mapiloko, Mabatho, Yudovskaya, Marina, Nex, Paul, Kinnaird, Judith, Montjoie, Richard, McCreesh, Matthew, Dyan, S., Prevec, S. A. |
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| Zdroj: |
Applied Earth Science; Sep2022, Vol. 131 Issue 3, p116-148, 33p |
| Abstrakt: |
[[1]] Sulphide-sulphide liquid immiscibility as an additional mechanism for Norilsk ores PGE enrich... Fractional crystallisation of sulphide liquids is widely recognised as the main mechanism of palladium-group platinum group element (PGE) enrichment of Norilsk magmatic sulphide ores. Two styles of PGE-Cu-Ni mineralisation are hosted in the Critical Zone-like sequences: (i) contact PGE-Ni-Cu mineralisation confined to the basal parts of the intrusions and within the footwall and (ii) reef-style (strata-bound) PGE horizon associated with discontinuous chromitite seams in the upper part of the intrusions [[1]]. Nickel sulphide mineralisation in Lower Zone serpentinised ultramafic rocks as well as PGE-Cu-Ni mineralisation in Critical Zone lithologies are targets of the recent exploration campaign by Lesego Platinum Uitloop (Pty) Ltd on the Uitloop II body [[1]] (Figure 1). Widespread, albeit low volume, chalcopyrite-galena symplectite ores at the top of the Oktyabrsky sulphide body indicate an onset of sulphide-sulphide immiscibility in residual sulphide liquid and its possible role in separation of the chalcophile elements. As the main carrier phase of chalcophile elements, immiscible sulphide liquid in mafic-ultramafic magmas has been considered as the crucial factor in forming magmatic Ni-Cu-(PGE) sulphide deposits. [Extracted from the article] |
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Complementary Index |
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