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TitreTGI 4: Investigating structural and tectonic controls on Devonian intrusion related mineralisation on the Connaigre Peninsula, Newfoundland
TéléchargerTéléchargement (publication entière)
AuteurRogers, N; Ruberti, G; Kellett, D A; van Staal, C R; Hanchar, J
SourceTGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation; par Rogers, N (éd.); Commission géologique du Canada, Dossier public 7843, 2015 p. 571-572, (Accès ouvert)
LiensCanadian Database of Geochemical Surveys, downloadable files
LiensBanque de données de levés géochimiques du Canada, fichiers téléchargeables
ÉditeurRessources naturelles Canada
Documentdossier public
Mediaen ligne; numérique
Référence reliéeCette publication est contenue dans Rogers, N; (2015). TGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation, Commission géologique du Canada, Dossier public 7843
Référence reliéeCette publication est reliée les publications suivantes
Lat/Long OENS -56.5000 -55.0000 48.0000 47.5000
Sujetsgisements porphyriques; cuivre porphyrique; prospection minière; minéralisation; altération; éléments d'indice; tungstène; molybdène; étain; bismuth; gisements minéraux; interpretations structurelles; modèles tectoniques; milieux tectoniques; éléments tectoniques; roches intrusives; roches granitiques; zones tectonostratigraphiques; caractéristiques structurales; analyses structurales; géologie économique; tectonique; géologie structurale; Paléozoïque; Dévonien
Illustrationslocation maps; plots; photographs
ProgrammeInitiative géoscientifique ciblée (IGC-4), Étude des gîtes porphyriques
Diffusé2015 06 11
Résumé(disponible en anglais seulement)
Targeted Geoscience Initiative 4 (TGI 4) is a 5 year Government of Canada program to help produce the next generation of innovative geoscience knowledge and analytical techniques that will result in more effective targeting of buried mineral deposits. The Geological Survey of Canada in collaboration with provincial and territorial surveys, industry and academia will conduct thematic, knowledge-driven projects based around ore systems. The thematic nature of TGI 4 means that individual projects are not defined by geographic region, but instead integrate data and knowledge from multiple sites across Canada, to optimise ore system categorisation.
Intrusion related (e.g., porphyry) deposits are the most important sources for Cu, Mo, W and Sn, along with Au, Ag, and PGEs. Porphyry deposits are large, low- to medium-grade deposits in which mineralisation is hosted within and immediately surrounding distinctive intrusive phases within larger intrusive complexes that commonly have a complex and prolonged emplacement history. The metallogenic contents of intrusion related deposits are diverse, reflecting a variety of tectonic settings.
The Connaigre Peninsula was selected to study the structural and tectonic controls on the formation of granitoid intrusion-related Sn-W-Mo mineralisation as it contains a variety of supracrustal units plus (apparently) barren and mineralised intrusives within a relatively constrained and accessible area. The main mineralised zones are related to the ca. 376 Ma Old Woman Stock and ca. 377 Ma phase of the Ackley Granite (Rencontre Lake facies of Tuach, 1987).
The detailed bedrock map of O'Brien (1992) has been simplified to highlight the main lithotectonic packages. Their distributions indicate three distinct tectonic blocks (herein Gander, Deadman's Bight and Wreck Cove blocks) that were amalgamated during the Devonian along major fault zones. The topographically prominent Hermitage Bay Fault has traditionally been considered to represent the Gander - Avalon boundary in this area. However, the recently obtained Silurian age for the Pass Island Granite indicates against this, as Avalonia (sensu lato) was on the passive margin at that time. In contrast to the Hermitage Bay Fault, the White Horse - East Bay fault zone, although major break, is obscured by younger sequences and so its exact position is unknown. It is interpreted to be positioned to the north-west of the Cambrian passive margin style sequences of the Young's Cove Group. In this model the White Horse - East Bay fault zone also separates the Upper Devonian Poole's Cove and Great Bay De L'Eau formations. As these formations: i) occupy approximately the same stratigraphic position; ii) are both red to buff coloured sandstone to boulder conglomeratic sequences; and iii) both appear to unconformably overlie the likely Lower Devonian Cinq Isles Formation, they are considered as a single map unit for this study.