| Titre | Structural and tectonic controls on Devonian intrusion related mineralisation on the Connaigre Peninsula, Newfoundland |
| Télécharger | Téléchargements |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Ruberti, G; Rogers, N; Kellett, D A ; van Staal, C R; Hanchar, J |
| Source | TGI 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. 559-560, https://doi.org/10.4095/296490  Accès ouvert |
| Liens | Canadian Database of Geochemical Surveys, downloadable files
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| Liens | Banque de données de levés géochimiques du Canada,
fichiers téléchargeables
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| Image |  |
| Année | 2015 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/296490 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans TGI 4 -
Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation |
| Formats | pdf |
| Province | Terre-Neuve-et-Labrador |
| SNRC | 1M |
| Région | Connaigre Peninsula |
| Lat/Long OENS | -56.5000 -55.0000 48.0000 47.5000 |
| Sujets | gisements porphyriques; cuivre porphyrique; prospection minière; minéralisation; altération; éléments d'indice; tungstène; molybdène; étain; bismuth; gisements minéraux; interpretations structurelles;
roches intrusives; roches granitiques; zones tectonostratigraphiques; datations au uranium-plomb; géologie économique; tectonique; géologie structurale; Paléozoïque; Dévonien; Silurien |
| Illustrations | cartes de localisation; graphiques; photographies |
| Programme | Initiative géoscientifique ciblée (IGC-4) Étude des gîtes porphyriques |
| Diffusé | 2015 06 11; 2023 03 17 |
| Résumé | (disponible en anglais seulement)
The Canadian Appalachians represent an archetypal ancient, accretionary orogen the study of which has played a substantial role in developing modern geological
concepts. From the initial simplistic models of a mountain belt deriving from the closure of the Iapetus Ocean, our understanding has evolved, recognising a richer, more complex geological history. Current models define multiple collisions between
arcs and microcontinents due to the closures of interposed oceans and seaways. Delineating specific tectonic events provides context to the various periods and styles of mineralisation produced, which in turn can define new exploration models for the
next generation of deposits.
One of the least understood deposit types in the Canadian Appalachians are the Devonian granitoid intrusion-related Sn-W-Mo mineralisation. The Connaigre Peninsula was selected to study such deposits as it contains a
variety of supracrustal units plus (apparently) barren and mineralised intrusives within a relatively constrained and accessible area. The distributions of the main lithotectonic packages indicate three distinct tectonic blocks that were amalgamated
by the Middle Devonian, and subsequently intruded by Upper Devonian granitoids concurrent with clastic sedimentation.
The ca. 376 Ma Old Woman Stock contains several known Mo occurrences. Molybdenite is disseminated and associated with vugs
containing dog-tooth quartz, and intense alteration zones (up to 5 cm wide) are localised along north - south to north-west - south-east trending joints. The distribution of deposits demonstrates a potential linkage between regional structures and
the localisation of mineralisation. At the large scale, the Connaigre Peninsula in the Upper Devonian is interpreted to be in extension associated with far removed non-orthogonal accretion of other peri-Gondwanan elements to composite Laurentia. It
is notable however that the mineralisation does not occur at a major fault, but rather at the intersection of a prominent north- east to south-west lineament and well-developed north - south to north-west - south-east jointing. The implication is
that the high-angle intersection of breaks that are contemporaneous with intrusion but have relatively little motion provide ideal pathways for mineralising fluids. In contrast to the Old Woman Stock, the adjacent, approximately coeval to slightly
younger Belleoram Granite is apparently barren. It remains unclear why the Belleoram Granite contains no known Sn-W-Mo mineralisation. Possible explanations include: i) its hybrid nature makes it compositionally unsuitable; ii) it formed at too
shallow a crustal depth; or iii) it was too dry and did not develop fluid pathways. |
| Sommaire | (Résumé en langage clair et simple, non publié)
L'Initiative géoscientifique ciblée (IGC-4) est un programme géoscientifique fédéral de collaboration qui fournit à l'industrie les
connaissances géoscientifiques et les techniques novatrices de prochaine génération dont elle a besoin pour mieux détecter les gîtes minéraux enfouis, réduisant ainsi certains risques liés à l'exploration. Ce volume résume les activités de recherche
effectuées dans le cadre du projet de minéralisation lié à des intrusions de l'Initiative géoscientifique ciblée 4 qui était axé sur des systèmes minéralisés porphyriques associés aux dépôts de Cu et de Cu-Mo dans le centre-sud de la
Colombie-Britannique et aux dépôts de Sn-W-Mo-In au Nouveau-Brunswick, en Nouvelle-Écosse et à Terre-Neuve-et-Labrador. |
| GEOSCAN ID | 296490 |
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