GEOSCAN, résultats de la recherche


TitreThe search for surficial expressions of buried Cordilleran porphyry deposits; preliminary findings in a new TGI4 activity in the southern Canadian Cordillera
AuteurAnderson, R G; Plouffe, A; Ferbey, T; Dunn, C E
SourceCommission géologique du Canada, Dossier public 7266, 2012, 82 pages, (Accès ouvert)
ÉditeurRessources naturelles Canada
Réunion25th annual KEG Conference and Trade Show; Kamloops; CA; avril 3-4, 2012
Documentdossier public
Mediaen ligne; numérique
Référence reliéeCette publication est reliée les publications suivantes
SNRC92I; 92P; 93A; 93B/01; 93B/02; 93B/07; 93B/08; 93B/09; 93B/10; 93B/15; 93B/16
Lat/Long OENS-123.0000 -120.0000 53.0000 50.0000
Sujetsgisements porphyriques; cuivre porphyrique; prospection minière; cadre tectonique; dépôts glaciaires; tills; analyses de till; géochimie du till; exploration de dépôts glaciaires; dépôts glaciaires; végétation; écoulement glaciaire; directions des mouvements de la glace; levés biochimiques; biogéochimie; altération; éléments d'indice; Mine Gibraltar ; géologie économique; géologie des dépôts meubles/géomorphologie; minéraux métalliques; tectonique
Illustrationslocation maps; photographs; plots; profiles
Bibliothèque de Ressources naturelles Canada - Ottawa (Sciences de la Terre)
ProgrammeÉtude des gîtes porphyriques, Initiative géoscientifique ciblée (IGC-4)
Diffusé2012 11 20
Résumé(Sommaire disponible en anglais seulement)
The Targeted Geoscience Initiative 4 is a 5-year federal program to provide public geoscience knowledge to improve deep mineral exploration effectiveness in seven principal ore systems, including those at intrusion-related base- and precious metal districts. In southern British Columbia, case studies were conducted around the Highland Valley, Gibraltar, Mount Polley and Woodjam porphyry deposits.
Activities in the national Intrusion-related Ore Systems include research on arc-related porphyry systems (mainly in the Canadian Cordillera) and non-arc setting porphyry-like and intrusion related systems (mainly in the Canadian Appalachians). The research will attempt to test the following hypotheses:
1. Tectonic setting and crustal structures dictate type, metal budget and where porphyry style mineralisation occurs and thus can predict locations of buried/hidden systems.
2. Distinctive geological, mineralogical and geochemical characteristics exist that can differentiate not only deposit sub-types but also the degree of fertility of hidden/deep mineralization.
In the Canadian Cordillera, preliminary inter-jurisdictional activities focussed on two aspects related to hypothesis 2: the composition and inferred source area for glacial till eroded from rocks; and, the composition of tree bark, as a geochemical probe into local sediments and bedrock. The initial stage of investigation comprised pilot studies at the Woodjam area, and Gibraltar and Highland Valley deposits in autumn 2011. The identification and interpretation of complex ice-flow directions from landform- to outcrop-scale ice-flow indicators help trace geochemical and indicator mineral anomalies in till back to their bedrock source. Initial results for heavy mineral concentrates from till indicate the potential usefulness of epidote as an indicator of propylitic alteration associated with some types of intrusion-related deposits. More research will be dedicated to the development of epidote as a porphyry indicator mineral.
The studies presented here tested the utility of tree bark and till for detecting buried mineralization and provide new insights into effective ways of exploring for deep and hidden mineralization.