| Titre | Integration of rock properties and geophysics, Bathurst Mining Camp |
| Télécharger | Téléchargements |
| |
| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Tschirhart, P A; Morris, W A |
| Source | Targeted Geoscience Initiative 4: Contributions to the understanding of volcanogenic massive sulphide deposit genesis and exploration methods development; par Peter, J M (éd.); Mercier-Langevin, P (éd.); Commission géologique du Canada, Dossier public
7853, 2015 p. 101-115, https://doi.org/10.4095/296547  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/10.4095/296547 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Targeted
Geoscience Initiative 4: Contributions to the understanding of volcanogenic massive sulphide deposit genesis and exploration methods development |
| Formats | pdf |
| Province | Nouveau-Brunswick |
| SNRC | 21O/01; 21O/02; 21O/03; 21O/06; 21O/07; 21O/08; 21O/09; 21O/10; 21O/11; 21P/04; 21P/05; 21P/12 |
| Région | Halfmile Lake; Bathurst; Grand-Sault; Nepisiguit River |
| Lat/Long OENS | -66.5833 -65.7500 47.7500 47.1333 |
| Sujets | analyse par spectromètre de masse; minéralisation; zinc; cuivre; plomb; or; argent; gîtes volcanogènes; gîtes sulfureux; densités; susceptibilité magnétique; interprétations géophysiques; Camp minier de
Bathurst; géologie économique; géophysique; Paléozoïque; Ordovicien |
| Illustrations | cartes de localisation; tableaux; graphiques; images |
| Programme | Initiative géoscientifique ciblée (IGC-4) Étude des gîtes de sulfures massifs volcaniques |
| Diffusé | 2015 06 11; 2023 03 17 |
| Résumé | (disponible en anglais seulement)
Physical rock property information is an important aspect of geophysical processing and interpretation as it provides a direct link between geophysical data and
geological interpretations. Herein, the existing physical rock property (density and magnetic susceptibility measurements) database for host rocks and volcanogenic massive sulphide (VMS) mineralization in the Bathurst Mining Camp (BMC), northern New
Brunswick, is expanded by incorporating new measurements taken on in situ samples and drill cores from throughout the BMC. Descriptive statistics are calculated and presented, and density-magnetic susceptibility bivariate plots are used to illustrate
patterns indicative of changes in the abundances of paramagnetic versus ferrimagnetic mineral phases. A discrete object magnetic inversion, solving for the remanent magnetization vector of the Armstrong B anomaly, is computed. The inversion is
constrained geometrically by geological mapping at surface and diamond drilling at depth. Magnetic susceptibility values for the country rock and mineralization are from the physical property database. Results of the inversion suggest that the
remanent vector was acquired sometime between 470 and 420 Ma, likely during the Salinic orogeny. Density information is used to reprocess ground gravity and airborne gravity gradiometry (AGG) data by applying a laterally variable Bouguer and terrain
density correction linked to averaged, measured density values and mapped extents of the different tectonostratigraphic groups that make up the BMC. The results of this reprocessing subtly change the gravity and gravity-gradient anomaly patterns
allowing for isolated anomalies to be more discretely resolved and reduce the impact of the terrain-related signal in the AGG data. Finally, helicopterborne frequency domain electromagnetic data for a small test site within the BMC are inverted for
magnetic susceptibility and forward modelled into a magnetic anomaly grid. Magnetic susceptibility values from the physical property database are used to validate the results of the inversion. This computed near-surface magnetic anomaly grid is then
used as a reference to effectively filter measured total magnetic intensity data to represent solely near-surface magnetic sources. Although petrophysical measurements in the BMC may not apply elsewhere, the various methodologies presented are
appropriate wherever the geological and geophysical requirements of the method are met. |
| 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 synthétise 12 activités de
recherche complétées dans le cadre du projet sur les systèmes minéralisés sulfures massifs volcanogènes de l'IGC-4. Ces activités portaient notamment sur les gisements de types SMV enrichis en métaux précieux (Au, Ag) ainsi que sur le développement
de vecteurs et de méthodes non-conventionnelles de détection pour les gisements de SMV. |
| GEOSCAN ID | 296547 |
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