| Titre | Igneous rocks and hydrothermal alteration of Lower Carboniferous sedimentary rocks, Clarke Head, Minas Fault Zone, western Nova Scotia |
| Télécharger | Téléchargements |
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| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Pe-Piper, G; Nagle, J; Piper, D J W |
| Source | Commission géologique du Canada, Dossier public 8314, 2017, 640p., https://doi.org/10.4095/306289  Accès ouvert |
| Année | 2017 |
| Éditeur | Ressources naturelles Canada |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/306289 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est reliée à Detailed
mineralogical data from hydrothermally altered igneous rocks at Clarke Head, Minas Fault Zone, western Nova Scotia |
| Liens | readme
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| Formats | pdf |
| Province | Nouvelle-Écosse |
| SNRC | 11E/05; 21H/08 |
| Région | Clarke Head; Parrsboro; Minas Basin |
| Lat/Long OENS | -64.3667 -63.9667 45.5000 45.3333 |
| Sujets | géologie du substratum rocheux; lithologie; roches ignées; roches intrusives; gabbros; lamprophyres; syenites; diorites; granulites; pegmatites; roches mafiques; feldspath; analcime; scapolite;
mégabrèches; roches sédimentaires; calcaires; grès; xénolites; siltstones; gypse; roches clastiques; carbonates; hydroxydes; oxydes; caractéristiques structurales; failles; intrusions; plutons; batholites; filons; roches hôtes; gisements minéraux;
fer; genèse des minerais; minéralisation; altération hydrothermale; paragenèse; géothermométrie; chlorite; évolution tectonique; antécédents tectoniques; brèches tectoniques; analyses au microscope électronique à balayage; travaux de prospection;
analyses de textures; Zone de cisaillement de Cobequid ; Bassin de Cumberland ; Terrane de Meguma ; Batholite de South Mountain ; Faille de Cobequid ; Faille de Kirkhill ; Bloc de Jeffers ; Groupe de Cumberland ; Groupe de Windsor ; Groupe d'Horton ;
Formation de Cheverie ; Formation de West Bay ; géologie régional; géologie économique; tectonique; pétrologie ignée et métamorphique; géochimie; minéralogie; Phanérozoïque; Mésozoïque; Trias; Paléozoïque; Carbonifère; Dévonien |
| Illustrations | tableaux; cartes géolscientiques généralisées; photographies; photomicrographies; graphiques géochimiques; histogrammes; cartes géochronologiques; images numériques; graphiques |
| Programme | Division de la CGC atlantique |
| Programme | CRSNG Conseil de recherches en sciences
naturelles et en génie du Canada |
| Diffusé | 2017 12 14 |
| Résumé | (disponible en anglais seulement)
Fault zone megabreccia exposed at Clarke Head, near Parrsboro, Nova Scotia, is a splay of the mid-Carboniferous Minas Fault Zone. Lower Carboniferous
sedimentary rocks and Upper Devonian-Lower Carboniferous igneous rocks occur as megablocks within the fault zone. This study investigated: 1) the character of the igneous rocks in the Clarke Head fault zone and (2) the type of hydrothermal veins
cutting sedimentary and/or igneous rocks in the fault zone. This information is then used to make comparisons with the evolution of the igneous and hydrothermal systems in the Cobequid fault zone to the north.
Igneous rocks comprise gabbro that
was intruded by syenite and diorite that either intruded or has xenoliths of grey silty sandstone. The syenite contains magmatic rutile and analcime; magmatic K-feldspar has been largely replaced by scapolite, which shows a temporal transition from
more Cl rich to more carbonate rich varieties. The source of the Cl was probably Windsor Group halite.
Sedimentary rocks in the fault zone include Lower Horton Group siltstones and sandstones, Windsor Group gypsum and limestones, and grey to
reddish clastic rocks that might be either Cheverie Formation or West Bay Formation. All these rocks are cut by Fe-carbonate and (hydr)oxide veins that have younger titania minerals, synchysite, barite, zircon and xenotime. These veins cross-cut
older quartz-chlorite-calcite veins, which in turn only in the Lower Horton Group cross-cut albite veins. A similar succession of vein minerals has been described in the literature from the Cobequid Fault to the north.
Taken together, the vein
systems and the igneous rocks extend knowledge about the igneous and hydrothermal systems along the mineralised Minas Fault Zone and provide opportunities for more precise dating of the complex late Paleozoic tectonic events in the region. |
| Sommaire | (Résumé en langage clair et simple, non publié)
Une nouvelle étude d'une importante zone de failles minéralisées en Nouvelle-Écosse fournit de nouvelles preuves de son âge et de son
caractère. |
| GEOSCAN ID | 306289 |
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