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http://hdl.handle.net/2445/179909
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DC Field | Value | Language |
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dc.contributor.author | González Jiménez, José María | - |
dc.contributor.author | Piña, Rubén | - |
dc.contributor.author | Kerestedijian, T.N. | - |
dc.contributor.author | Gervilla Linares, Fernando | - |
dc.contributor.author | Borrajo, I. | - |
dc.contributor.author | Farré De Pablo, Júlia | - |
dc.contributor.author | Proenza Fernández, Joaquín Antonio | - |
dc.contributor.author | Tornos, Fernando | - |
dc.contributor.author | Roqué, Josep | - |
dc.contributor.author | Nieto, Fernando | - |
dc.date.accessioned | 2021-09-10T06:32:46Z | - |
dc.date.available | 2021-09-10T06:32:46Z | - |
dc.date.issued | 2021-01 | - |
dc.identifier.issn | 0375-6742 | - |
dc.identifier.uri | http://hdl.handle.net/2445/179909 | - |
dc.description.abstract | Porphyry Cu can contain significant concentrations of platinum-group elements (PGE: Os, Ir, Ru, Rh, Pt, Pd). In this study, we provide a comprehensive in situ analysis of noble metals (PGE, Au, Ag) for (Cusingle bondFe)-rich sulfides from the Elatsite, one of the world's PGE-richest porphyry Cu deposits. These data, acquired using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), indicate that Pd was concentrated in all the (Cusingle bondFe)-rich sulfides at ppm-levels, with higher values in pyrite (~6 ppm) formed at the latest epithermal stage (i.e., quartz-galena-sphalerite assemblage) than in bornite and chalcopyrite (<5 ppm) from the hypogene quartz-magnetite-bornite-chalcopyrite ores. Likewise, Au is significantly more concentrated in pyrite (~5 ppm) than in the (Cusingle bondFe)-rich sulfides (≤0.08 ppm). In contrast, Ag reaches hundreds of ppm in pyrite and bornite (~240 ppm) but is in much lesser amounts in chalcopyrite (<25 ppm). The inspection of the time-resolved spectra collected during LA-IPC-MS analyses indicates that noble metals are present in the sulfides in two forms: (1) structurally bound (i.e., solid solution) in the lattice of sulfides and, (2) as nano- to micron-sized inclusions (Pdsingle bondTe and Au). These observations are further confirmed by careful investigations of the PGE-rich (Cusingle bondFe)-rich sulfides by combining high-spatial resolution of field emission scanning electron microscope (FESEM) and focused ion beam and high-resolution transmission electron microscopy (FIB/HRTEM). A typical Pd-bearing mineral includes the composition PdTe2 close to the ideal merenskyite but with a distinct crystallographic structure, whereas Au is mainly found as native element. Our detailed mineralogical study coupled with previous knowledge on noble-metal inclusions in the studied ores reveals that noble metal enrichment in the Elatsite porphyry ores was mainly precipitated from droplets of Au-Pd-Ag telluride melt (s) entrained in the high-temperature hydrothermal fluid. These telluride melts could separate at the time of fluid unmixing from the silicate magma or already be present in the latter either derived from deep-seated crustal or mantle sources. Significant enrichment in Pd and Au (the latter correlated with As) in low-temperature pyrite is interpreted as remobilization of these noble metals from pre-existing hypogene ores during the epithermal overprinting. | - |
dc.format.extent | 20 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Elsevier B.V. | - |
dc.relation.isformatof | Versió postprint del document publicat a: https://doi.org/10.1016/j.gexplo.2020.106664 | - |
dc.relation.ispartof | Journal of Geochemical Exploration, 2021, vol. 220, p. 106664 | - |
dc.relation.uri | https://doi.org/10.1016/j.gexplo.2020.106664 | - |
dc.rights | cc-by-nc-nd (c) Elsevier B.V., 2021 | - |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/4.0/ | - |
dc.source | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) | - |
dc.subject.classification | Mineralogia | - |
dc.subject.classification | Minerals de platí | - |
dc.subject.classification | Porfirita | - |
dc.subject.classification | Sulfurs | - |
dc.subject.classification | Mines de coure | - |
dc.subject.classification | Bulgària | - |
dc.subject.other | Mineralogy | - |
dc.subject.other | Platinum ores | - |
dc.subject.other | Porphyry | - |
dc.subject.other | Sulfides | - |
dc.subject.other | Copper mines | - |
dc.subject.other | Bulgaria | - |
dc.title | Mechanisms for Pd-Au enrichment in porphyry-epithermal ores of the Elatsite deposit, Bulgaria | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 708281 | - |
dc.date.updated | 2021-09-10T06:32:46Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
dc.identifier.pmid | 33041466 | - |
Appears in Collections: | Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada) |
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File | Description | Size | Format | |
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708281.pdf | 17.83 MB | Adobe PDF | View/Open |
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