| Reference Type | Journal (article/letter/editorial) |
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| Title | HRTEM Study of Desulfurization of Pt- and Pd-Rich Sulfides from New Caledonia Ophiolite |
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| Journal | Minerals |
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| Authors | Cano, Néstor | Author |
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| González-Jiménez, José M. | Author |
| Gervilla, Fernando | Author |
| Kerestedjian, Thomas N. | Author |
| Year | 2025 | Volume | < 15 > |
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| Issue | < 1 > |
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| URL | |
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| DOI | doi:10.3390/min15010066Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17882620 | Long-form Identifier | mindat:1:5:17882620:8 |
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| GUID | 0 |
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| Full Reference | Cano, Néstor, González-Jiménez, José M., Gervilla, Fernando, Kerestedjian, Thomas N. (2025) HRTEM Study of Desulfurization of Pt- and Pd-Rich Sulfides from New Caledonia Ophiolite. Minerals, 15 (1). doi:10.3390/min15010066 |
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| Plain Text | Cano, Néstor, González-Jiménez, José M., Gervilla, Fernando, Kerestedjian, Thomas N. (2025) HRTEM Study of Desulfurization of Pt- and Pd-Rich Sulfides from New Caledonia Ophiolite. Minerals, 15 (1). doi:10.3390/min15010066 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | Oxygen-bearing platinum group minerals (O-bearing PGMs) are intergrown with base metal sulfides (BMS, e.g., pentlandite–[NiFe]9S8) within fractures in chromite grains from chromitite bodies on Ouen Island, New Caledonia. These PGMs are hosted in chlorite and serpentine, which formed during serpentinization of olivine and pyroxene. The O-bearing PGM grains are polygonal, show microfracturing (indicating volume loss), and contain Pt-Pd-rich sulfide remnants, suggesting pseudomorphic replacement of primary (magmatic) sulfides. They display chemical zonation, with Pt(-Pd-Ni-Fe) relict sulfide cores replaced by Pt-Fe-Ni oxidized alloy mantles and Pt-Cu-Fe(-Pd) alloy rims (tulameenite), indicating desulfurization. The core and mantle show a nanoporous structure, interpreted as the result of coupled dissolution–reprecipitation reactions between magmatic sulfides and low fO2–fS2 serpentinite-related fluids, probably formed during olivine transformation to serpentine + magnetite (early stages of serpentinization). This fluid infiltrated magmatic sulfides (PGE-rich and BMS), degrading them to secondary products and releasing S and metals that were accommodated in the mantle and rim of O-bearing PGMs. Upon olivine exhaustion, an increase in fO2 might have stabilized Pt-Fe-O compounds (likely Pt0/Pt-Fe + Fe oxyhydroxides) alongside Ni-Fe alloys. Our results show that post-magmatic desulfurization of primary sulfides produces complex nano-scale intergrowths, mainly driven by changes in the fluid’s physicochemical properties during serpentinization. |
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