Geology and geochemistry of the Fenton Creek Zone (Manitoba, Canada)
Notice bibliographique
Résumé
The Fenton Creek deposit is a new Zn-Cu base metal discovery situated 70km southeast of the town of Snow Lake, which hosts numerous polymetallic Zn-Cu and Cu-Zn volcanic hosted massive sulphide (VHMS) deposits. The Fenton Creek deposit was located using airborne EM and MAG techniques and is completely blind with no surface expression as it is overlain by 30m of Paleozoic limestone and dolomite and 20m of muskeg. Diamond drilling has defined an initial geologic resource of 2.3 Mt grading 0.09g/t Au, 20.42g/t Ag, 0.56% Cu and 7.44%Zn. The deposit consists of two massive sulphide lenses hosted within a mixed sequence of graphitic metasediment and volcaniclastics. Amphibolite grade metamorphism has destroyed most of the primary features in the host rocks and caused a complete recrystallisation and coarsening of the ore. The footwall to the deposit is a quartz-muscovite-sillimanite schist of rhyolitic composition. The immediate hanging wall contains biotite-clinopyroxene-plagioclase schist and amphibole-plagioclase schist of basaltic composition, which is overlain by a substantial thickness of quartz-biotite-sillimanite schist of rhyodacite composition. The ore position is marked by metasediments including garnetifferous and graphitic metapelite. Analysis of the carbon isotopes from the graphite suggests that the source of the carbon is biogenic, which indicates a seafloor position. Unlike many of the known and well studied VHMS deposits in the Snow Lake Assemblage which have discordant pipe-like hydrothermal alteration with sericitized peripheries and chloritized cores, the hydrothermal alteration in the Fenton Creek stratigraphy consists of fault related K-feldspar-muscovite (formerly quartz-sericite alteration) that occurs in and around the fault zones and stratiform K-feldspar, muscovite, sillimanite, cordierite and cummingtonite (formerly sericite +/- chlorite alteration) confined to the footwall. The footwall alteration is fairly weak consistent with that found in a stratiform/blanket-like volcanic hosted massive sulphide system. Mass balance calculations indicate that the footwall alteration reflects an overall loss in Si, AI and Na with only minor gains in Ca and Mg. The ore lenses comprising the Fenton Creek zone contain three different types of mineralisation that include disseminated, semi-massive and massive styles. The massive and semi-massive mineralisation consist of pyrrhotite +/- sphalerite-chalcopyrite while the disseminated mineralisation can be divided into three types of mineral associations (A) Pyrrhotite +/- chalcopyrite-sphalerite, (8) Pyrrhotite +/- galena-chalcopyrite-tetrahedrite (C) Pyrrhotite +/graphite- chalcopyrite-sphalerite. Spatially type 8 disseminated mineralized rock is observed proximal to the semi-massive and massive mineralisation while type A and C were observed both in and proximal to the semi-massive and massive styles of mineralisation. Metal zonation studies of section 400N suggest that Zn and Cu dominate the upper lens whereas; the lower lens contains Pb, Ag, and Au. Plotting of the Zn ratio and the Cu ratio indicate the hottest portions of the ore lenses exist down plunge from the thickest portion of massive sulphide intersected. Geologic features including the arc-rift related basaltic volcanic/volcaniclastic rocks in the immediate hanging wall, overlain by large thicknesses of rhyodacitic volcaniclastics and biogenic carbon in the graphite of the Fenton Creek zone suggest that it may have formed in rift environment as a seafloor/sub-seafloor volcanic hosted massive sulphide deposit. This style of deposit may represent a new and previously unexplored mineralized stratigraphic position within the Snow Lake Assemblage.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| 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 | 0,003 | 0,005 |
| Études des sciences et des technologies | 0,003 | 0,001 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,001 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,007 | 0,001 |
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 source (Gemma direct ou Codex distillé), 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 ».