|Titre||TGI 4 intrusion related mineralisation project: developing new ways to detect hidden deposits|
|Auteur||Rogers, N; McClenaghan, B; McClenaghan, S; Chapman, J; Kellett, D; Parkhill, M; Thorne, K; Lentz, D; Plouffe, A; Anderson, B|
|Source||Abstracts 2012: Exploration, Mining and Petroleum New BrunswickF; par Keith, E A (éd.); 2012 p. 23|
|Liens||Online - En ligne |
|Séries alt.||Secteur des sciences de la Terre, Contribution externe 20120498|
|Réunion||Exploration, Mining and Petroleum New Brunswick; Fredericton; CA; Novembre 2012|
|Document||publication en série|
|Media||en ligne; numérique; papier|
|Sujets||gisements porphyriques; gisements minéraux; tungstène; molybdène; étain; minéralisation; interpretations structurelles; méthodes analytiques; géologie structurale; Trias; Jurassique|
|Programme||Étude 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 mineralization is hosted within and immediately surrounding distinctive intrusive phases within larger intrusive complexes that commonly have a complicated 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 British Columbia interior and the array of mineralized 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 Appalachian exploration is how to detect mineralized sequences through the extensive surficial
coverage. Indicator mineral dispersal is well established for diamond exploration, but has the potential to be applied to other mineralizing systems within glaciated terrains. Test cases for the applicability and cost effectiveness of indicator
mineral exploration are being conducted in the Sisson Brook and Mount Pleasant deposit areas. Furthermore, it might be possible to resolve the potential ore system fertility of intrusions through mineral trace element fingerprinting of common phases
and fluid inclusions utilising techniques such as in situ laser ablation ICP-MS analysis. Several graduate studies have been instigated to investigate these methods at sites across New Brunswick.