Sources of Sulfide Mineral Components in Au-Ag-W-Sb-Hg Deposits, Stibnite-Yellow Pine District, Idaho: Genetic Relationships to Host and Subjacent Rocks, and Regional Context
Notice bibliographique
Résumé
Abstract Approximately 5.6 million ounces (Moz) of Au (~174 tonnes [t]) and significant Sb, Ag, W, and Hg were produced from deposits in the Stibnite-Yellow Pine district, Valley County, Idaho, or exist in drill-defined resources. Epigenetic minerals of deposits and resources occur in fault zones in late Cretaceous granitic rocks of the Idaho batholith, in late Proterozoic-early Paleozoic metasedimentary rocks of the Stibnite pendant, and in vein and replacement deposits in pendant strata. Deposits and resources formed during at least five paragenetically distinct events that spanned approximately 24 m.y. The district-wide distribution of Au, Sb, W, and Hg are consistent with temperature gradient zoning in, adjacent to, and distal to major fluid conduits represented by the high-angle, north- to northeast-trending Meadow Creek and West End fault zones. Sulfide minerals of four events and host rocks were evaluated for component sources using Pb, Sr, and S isotope values—which are determined by microbeam and bulk analytical techniques—and by comparison to isotope values, stratigraphy, and ages of host rocks of polymetallic Ag-Au-Cu-Co-Pb-Zn deposits, host rocks, and plutonic rocks in Idaho, Montana, Alberta, and the Great Basin. Based on initial 206Pb/204Pb, 208Pb/204Pb, and 87Sr/86Sr isotope values (13.17–21.26, 31.93–41.24, and 0.703–0.725, respectively) of sulfide minerals and whole rocks, sulfide mineral paragenesis, and comparisons, event 1A pyrite in vein and contact zone deposits (ca. 86–75 Ma); event 2 As ± Au pyrite, which contains most mined and resource Au (ca. 70–58 Ma); and some event 5 stibnite (ca. 49–46 Ma) were sourced from late Proterozoic-early Paleozoic and older, more radiogenic metasedimentary rocks. Alternatively, they were indirectly from Cretaceous intrusions in the Stibnite-Yellow Pine district that obtained Pb from these metasedimentary rocks. Less radiogenic Pb isotope values of other event 5 stibnite and cinnabar in mined deposits and resources are largely indistinguishable from those of the areally extensive Atlanta lobe of the Idaho batholith, reflecting mixed crust sources including Archean, Mesoproterozoic, and Paleozoic rocks. The broad range of δ34S values of sulfide minerals in deposits and host rocks of the Stibnite-Yellow Pine district (–19 to 9‰) and large masses of metasedimentary rocks adjacent to deposits reflect reduction of pore seawater sulfate following sedimentation and transfer of S in sedimentary pyrite to deposits. The relatively confined range of mostly positive δ34S values of minerals comprising events 1, 2, and 5 in granitic rocks (~1–9‰) implies that sedimentary pyrite was formed by thermochemical sulfate reduction (TSR) with δ34S values homogenized by high-temperature fractionation during Cretaceous magmatism. The broader range of δ34S values of event 5 cinnabar and realgar in metasedimentary rocks (~19–3‰) reflects direct replacement of sedimentary pyrite formed by thermochemical and biogenic sulfate reduction. Sulfur and Pb isotope systematics link many polymetallic deposits in Idaho, Montana, and the Great Basin, including those of the Stibnite-Yellow Pine district, to sedimentary source rocks and Mesozoic magmatism and demark a dominant metallogeny of large parts of the interior western United States.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».