GEOSCAN, résultats de la recherche


TitreIdentifying new methods to detect hidden intrusion related mineralisation
AuteurRogers, N; Plouffe, A; McClenaghan, B; Anderson, B
SourceL'Association géologique du Canada-L'Association minéralogique du Canada, Réunion annuelle conjointe, Recueil des résumés vol. 35, 2012 p. 119
LiensOnline - En ligne (PDF 8.46 MB)
Séries alt.Secteur des sciences de la Terre, Contribution externe 20130611
RéunionGAC-MAC Joint annual meeting; St. John's, NL; CA; mai 2012
Documentpublication en série
Mediaen ligne; numérique
Sujetsgisements porphyriques; gisements minéraux; tungstène; molybdène; étain; minéralisation; interpretations structurelles; méthodes analytiques; géologie structurale; Trias; Jurassique
ProgrammeÉtude des gîtes porphyriques, Initiative géoscientifique ciblée (IGC-4)
Résumé(disponible en anglais seulement)
Targeted Geoscience Initiative 4 (TGI 4) is a 5 year Government of Canada program to conduct thematic, knowledge-driven ore systems studies aimed at discovering future resources through more effective targeting of buried mineral deposits.
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 purpose of this project is to develop more effective exploration criteria to identify and evaluate fertile intrusive mineralizing systems at depth and/or that are hidden beneath surficial deposits. In order to achieve this studies are being undertaken at sites associated with the Triassic- Jurassic porphyry deposits of the BC interior and for the array of mineralised Canadian Appalachian Siluro-Devonian intrusions, for which the fundamental geoscience knowledge is often lacking.
The alteration halos and vein systems associated with intrusion related mineralization can represent a much larger exploration target than the actual economic orebody itself. In the right circumstances alteration and other vectors can be applied to identify hidden deposits. A common problem facing Cordilleran and Appalachian exploration is how to detect mineralised sequences through the extensive surficial coverage. Consequently research activities are focussing on surficial geochemistry, biogeochemistry, up-flow of volatiles, indicator mineral dispersal and the geophysical characteristics of intrusion related deposits. Indicator mineral dispersal is well established for diamond exploration, but has the potential to be applied to other mineralising systems within glaciated terrains. Furthermore, utilising mineral trace element fingerprinting, it might be possible to develop methods for common phases. Also as trees collect various elements through their roots, the chemistry of their bark can be used as a natural probe into the subsurface to help pinpoint buried mineral deposits and increase the effectiveness of deep mineral exploration.