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TitleTGI 4 - Intrusion Related Mineralisation Project: a synthesis
DownloadDownload (whole publication)
AuthorRogers, N
SourceTGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation; by Rogers, N (ed.); Geological Survey of Canada, Open File 7843, 2015 p. 1-13, https://doi.org/10.4095/296463 (Open Access)
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Year2015
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2015). TGI 4 - Intrusion Related Mineralisation Project: new vectors to buried porphyry-style mineralisation, Geological Survey of Canada, Open File 7843
File formatpdf
ProvinceBritish Columbia; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario
NTS92I; 92P; 93A; 93B; 21A; 21G; 21H; 1M; 11D; 11E; 11P/13; 11P/14; 11P/15; 11P/16; 32D/01; 32D/02; 32D/07; 32D/08; 21G/14; 21G/15
AreaWilliams Lake; Woodjam; Gibraltar; Highland Valley; Mount Pleasant; Connaigre Peninsula; Mascarene Basin; Caledonian Highlands; Grey River; Moly Brook; Kirkland Lake; Côté Lake; Lake George; Fredericton
Lat/Long WENS -68.0000 -61.5000 46.0000 45.0000
Lat/Long WENS -56.5000 -55.0000 48.0000 47.5000
Lat/Long WENS-124.0000 -120.0000 53.0000 50.0000
Lat/Long WENS -78.4000 -78.4000 48.2833 48.2167
Subjectseconomic geology; surficial geology/geomorphology; metallic minerals; geochemistry; structural geology; tectonics; igneous and metamorphic petrology; geochronology; porphyry deposits; porphyry copper; mineral exploration; glacial deposits; tills; till analyses; till geochemistry; drift prospecting; drift deposits; vegetation; ice flow; ice movement directions; biogeochemical surveys; biogeochemistry; dispersal patterns; mineralization; alteration; indicator elements; tungsten; molybdenum; tin; bismuth; bulk samples; mineral deposits; structural interpretations; tectonic models; tectonic environments; tectonic elements; molybdenite; intrusive rocks; granitic rocks; fluid inclusions; quartz; metallogeny; petrographic analyses; granodiorites; petrogenesis; copper; gold; geobarometry; geothermometry; geochemical analyses; magmatic deposits; hydrothermal alteration; stable isotope studies; quartz veins; salinity; vein deposits; meteoric waters; granophile deposits; fluorspar; uranium lead dates; radiometric dates; igneous rocks; tourmaline; Archean; hydrothermal deposits; antimony; magmatism; biotite; magma differentiation; analytical methods; amphibole; uranium; mica; tantalum; lithium; granites; Gibraltar Mine; Highland Valley Mine; Sisson deposit; Mount Pleasant deposit; Northumberland till; Collins Pond till; Caledonia till; Old Woman Stock; Belleoram Granite; South Mountain Batholith; Evandale Granodiorite; Broad River Group; Woodjam deposit; Upper Beaver gold system; Cote Lake gold system; Lake George deposit; Acadian Orogeny; Devonian; Precambrian; Paleozoic
Illustrationslocation maps; photographs; flow charts; cross-sections
ProgramIntrusion/Porphyry Ore Systems, Targeted Geoscience Initiative (TGI-4)
Released2015 06 11
AbstractThe Targeted Geoscience Initiative 4 (TGI 4) was a 2010-15 Government of Canada research program to conduct thematic, knowledge-driven ore systems studies aimed at assisting in the discovery of future resources through more effective targeting of buried mineral deposits. Intrusion related (e.g., porphyry) deposits are the world's most important sources for Cu, Mo, W and Sn, as well as being a major contributor of Au, Ag, and PGEs. Porphyry deposits are typically 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 prolonged emplacement histories. To develop more effective exploration criteria to identify and evaluate deeply buried and/or hidden fertile intrusive mineralising systems, studies into Cu-Mo/Au and W-Mo-Sn systems are aimed at answering the following questions: i) are there distinctive proximal and distal footprints for deposit types that will allow identification of, and vectoring towards hidden economically viable deposits?; and ii) what are the triggering conditions and indicators of an hydrothermal-magmatic system of size and duration sufficient to develop a large porphyry deposit? To help answer these questions studies are being undertaken at sites associated with the Triassic-Jurassic porphyry deposits of the British Columbia interior and for the array of mineralised Devonian intrusions developed in the Canadian Appalachians.
A common problem facing Cordilleran and Appalachian exploration is how to detect intrusion-related mineralization through the extensive glacial sediment cover. Consequently, research activities are focussing at identifying key geochemical and mineral indicators in till near known mineralisation and their detrital dispersal down-ice. Indicators are being developed for the detection of mineralisation, but also the alteration halos and vein systems associated with mineralization, which represent much larger exploration targets than the actual economic orebody itself. Once identified in till, these indicators can be traced to their bedrock source using reconstructed ice movement vectors.
Structural relationships indicate that Sn-W-Mo mineralised intrusive systems can form due to extension associated with far removed non-orthogonal accretion. Deposits within these bodies form along fluid pathways such as the intersection of high-angle syntectonic breaks. Mineral potential can also be resolved through trace element fingerprinting. Subtle compositional changes in commonly occurring minerals (i.e., biotite) and fluid inclusions provide evidence of chemical variations related to magma fertility and vectors to mineralisation.
GEOSCAN ID296463