| Titre | Stratigraphy and lithogeochemistry of rocks from the Nugget Pond Deposit area, Baie Verte Peninsula, Newfoundland |
| Télécharger | Téléchargement (publication entière) |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Mueller, C; Piercey, S J ; Babechuk, M G; Copeland, D |
| Source | Targeted Geoscience Initiative 5: grant program final reports (2018-2020); par Targeted Geoscience Initiative Coordination Office; Commission géologique du Canada, Dossier public 8755, 2021 p. 217-234,
https://doi.org/10.4095/328989  Accès ouvert |
| Année | 2021 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/328989 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Targeted
Geoscience Initiative 5: grant program final reports (2018-2020) |
| Formats | pdf |
| Province | Terre-Neuve-et-Labrador |
| SNRC | 2E/13 |
| Région | Island of Newfoundland; Baie Verte Peninsula; Betts Cove |
| Lat/Long OENS | -55.8000 -55.7333 49.8667 49.8333 |
| Sujets | prospection minière; gisements minéraux; or; gîtes sulfureux; gîtes volcanogènes; genèse des minerais; minéralisation; contrôles des minerais; analyses stratigraphiques; lithogéochimie; trous de forage;
géologie du substratum rocheux; lithologie; roches ignées; roches volcaniques; basaltes; roches volcaniques mafiques; coulées de lave; laves en oreiller; tholéiites; brèches volcaniques; couches volcano-sédimentaires; volcanoclastique; roches
intrusives; gabbros; roches sédimentaires; siltstones; chailles; formations ferrifères; roches clastiques; roches mafiques; caractéristiques structurales; failles; discordances; antécédents tectoniques; magmatisme; système hydrothermal; intrusions;
géochimie du fer; géochimie de l'aluminium; anomalies géochimiques; géochimie du cerium; géochimie des éléments en trace; milieu sédimentaire; altération; modèles; Dépôt de Nugget Pond ; Mine Nugget Pond ; Province Appalachienne; Groupe de Snooks Arm
; Formation de Mount Misery ; Formation de Scrape Point ; Océan Iapetus; Complexe de Betts Cove ; géologie économique; géochimie; stratigraphie; tectonique; Sciences et technologie; Nature et environnement; Phanérozoïque; Paléozoïque; Ordovicien;
Cambrien |
| Illustrations | cartes de localisation; cartes géolscientiques généralisées; échelles stratigraphiques; diagraphies lithologiques; tableaux; graphiques géochimiques; diagrammes ternaires |
| Programme | Initiative géoscientifique ciblée (IGC-5) Gestion de la connaissance de IGC |
| Diffusé | 2021 10 27 |
| Résumé | (disponible en anglais seulement)
Stratigraphic and lithogeochemical data were collected from selected drill core from the Nugget Pond gold deposit in the Betts Cove area, Newfoundland. The
stratigraphy consists of a lower unit of basaltic rocks that are massive to pillowed (Mount Misery Formation). This is overlain by sedimentary rocks of the Scrape Point Formation that consist of lower unit of turbiditic siltstone and hematitic
cherts/iron formations (the Nugget Pond member); the unit locally has a volcaniclastic rich-unit at its base and grades upwards into finer grained volcaniclastic/turbiditic rocks. This is capped by basaltic rocks of the Scrape Point Formation that
contain pillowed and massive mafic flows that are distinctively plagioclase porphyritic to glomeroporphyritic. The mafic rocks of the Mount Misery Formation have island arc tholeiitic affinities, whereas Scrape Point Formation mafic rocks have normal
mid-ocean ridge (N-MORB) to backarc basin basalt (BABB) affinities. One sample of the latter formation has a calc-alkalic affinity. All of these geochemical features are consistent with results and conclusions from previous workers in the area.
Clastic sedimentary rocks and Fe-rich sedimentary rocks of the Scrape Point Formation have features consistent with derivation from local, juvenile sources (i.e., intra-basinal mafic rocks). The Scrape Point Formation sedimentary rocks with the
highest Fe/Al ratios, inferred to have greatest amount of hydrothermally derived Fe, have positive Ce anomalies on Post-Archean Australian Shale (PAAS)-normalized trace element plots. These features are consistent with having formed via hydrothermal
venting into an anoxic/ sub-oxic water column. Further work is needed to test whether these redox features are a localized feature (i.e., restricted basin) or a widespread feature of the late Cambrian-early Ordovician Iapetus Ocean, as well as to
delineate the role that these Fe-rich sedimentary rocks have played in the localization of gold mineralization within the Nugget Pond deposit. |
| Sommaire | (Résumé en langage clair et simple, non publié)
L'Initiative des géosciences ciblées (IGC) est un programme fédéral collaboratif. Ce programme fournit à l'industrie ce qui est requis pour la
prochaine génération des connaissances géoscientifiques et des techniques novatrices. Le résultat est l'identification des dépôts de minéraux en profondeur. Ce compendium est le résultat des récipiendaires des subventions d'IGC 2018-2020. |
| GEOSCAN ID | 328989 |
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