Unraveling a Rare Polygonal Gold–Pyrite Assemblage: Insights from the Lena Province, Bodaibo Mining District (Russia)
A rare polygonal gold assemblage from the Bodaibo mining district (Russia) was analyzed in this study. It resembles cubic native gold from the same area described as a gold pseudomorph after pyrite. The polygonal assemblage differs from these cubic gold samples by the absence of striations, its step...
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MDPI AG
2024-12-01
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| author | Isabella Pignatelli Gaston Giuliani Christophe Morlot Louis-Dominique Bayle |
| author_facet | Isabella Pignatelli Gaston Giuliani Christophe Morlot Louis-Dominique Bayle |
| author_sort | Isabella Pignatelli |
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| description | A rare polygonal gold assemblage from the Bodaibo mining district (Russia) was analyzed in this study. It resembles cubic native gold from the same area described as a gold pseudomorph after pyrite. The polygonal assemblage differs from these cubic gold samples by the absence of striations, its stepped morphology, and the presence of euhedral pyrite. It was analyzed with non-destructive techniques (SEM, VSI, and X-ray CT) in order to preserve the integrity of this exceptional sample. The experimental data allowed us to understand how this rare sample could be formed. A formation of secondary deposits, i.e., eluvial placers, is compatible with the mobilization and precipitation of gold by surface effects on primary pyrite, as well as oxidation episodes producing iron oxides/hydroxides. The redox condition in the geological environment caused the pyrite dissolution and release of gold in its structure, leading to the formation of a thin layer of gold on pyrite by epitaxy rather than pseudomorphism. |
| format | Article |
| id | doaj-art-7c686cf3f1f74ddb928556fc51f6bb40 |
| institution | Kabale University |
| issn | 2073-4352 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | MDPI AG |
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| series | Crystals |
| spelling | doaj-art-7c686cf3f1f74ddb928556fc51f6bb402025-01-24T13:27:59ZengMDPI AGCrystals2073-43522024-12-01151410.3390/cryst15010004Unraveling a Rare Polygonal Gold–Pyrite Assemblage: Insights from the Lena Province, Bodaibo Mining District (Russia)Isabella Pignatelli0Gaston Giuliani1Christophe Morlot2Louis-Dominique Bayle3Centre de Recherches Pétrographiques et Géochimiques (CRPG), UMR 7358 CNRS-UL, Université de Lorraine, 54500 Nancy, FranceCentre de Recherches Pétrographiques et Géochimiques (CRPG), UMR 7358 CNRS-UL, Université de Lorraine, 54500 Nancy, FranceLaboratoire Energie & Mécanique Théorique et Appliquée (LEMTA), Université de Lorraine, 54000 Nancy, FranceIndependent Researcher, 590 Chemin de Glavenas, 43200 Saint-Julien-du-Pinet, FranceA rare polygonal gold assemblage from the Bodaibo mining district (Russia) was analyzed in this study. It resembles cubic native gold from the same area described as a gold pseudomorph after pyrite. The polygonal assemblage differs from these cubic gold samples by the absence of striations, its stepped morphology, and the presence of euhedral pyrite. It was analyzed with non-destructive techniques (SEM, VSI, and X-ray CT) in order to preserve the integrity of this exceptional sample. The experimental data allowed us to understand how this rare sample could be formed. A formation of secondary deposits, i.e., eluvial placers, is compatible with the mobilization and precipitation of gold by surface effects on primary pyrite, as well as oxidation episodes producing iron oxides/hydroxides. The redox condition in the geological environment caused the pyrite dissolution and release of gold in its structure, leading to the formation of a thin layer of gold on pyrite by epitaxy rather than pseudomorphism.https://www.mdpi.com/2073-4352/15/1/4goldpyritepolygonal habitBodaibo mining districtepitaxypseudomorphism |
| spellingShingle | Isabella Pignatelli Gaston Giuliani Christophe Morlot Louis-Dominique Bayle Unraveling a Rare Polygonal Gold–Pyrite Assemblage: Insights from the Lena Province, Bodaibo Mining District (Russia) Crystals gold pyrite polygonal habit Bodaibo mining district epitaxy pseudomorphism |
| title | Unraveling a Rare Polygonal Gold–Pyrite Assemblage: Insights from the Lena Province, Bodaibo Mining District (Russia) |
| title_full | Unraveling a Rare Polygonal Gold–Pyrite Assemblage: Insights from the Lena Province, Bodaibo Mining District (Russia) |
| title_fullStr | Unraveling a Rare Polygonal Gold–Pyrite Assemblage: Insights from the Lena Province, Bodaibo Mining District (Russia) |
| title_full_unstemmed | Unraveling a Rare Polygonal Gold–Pyrite Assemblage: Insights from the Lena Province, Bodaibo Mining District (Russia) |
| title_short | Unraveling a Rare Polygonal Gold–Pyrite Assemblage: Insights from the Lena Province, Bodaibo Mining District (Russia) |
| title_sort | unraveling a rare polygonal gold pyrite assemblage insights from the lena province bodaibo mining district russia |
| topic | gold pyrite polygonal habit Bodaibo mining district epitaxy pseudomorphism |
| url | https://www.mdpi.com/2073-4352/15/1/4 |
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