| Title | TGI 4 - Intrusion Related Mineralisation Project: a synthesis |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Rogers, N |
| Source | TGI 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 |
| Links | Canadian Database of Geochemical Surveys, downloadable
files
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| Links | Banque de données de levés géochimiques du Canada,
fichiers téléchargeables
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| Image |  |
| Year | 2015 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in TGI 4 - Intrusion Related
Mineralisation Project: new vectors to buried porphyry-style mineralisation |
| File format | pdf |
| Province | British Columbia; New Brunswick; Newfoundland and Labrador; Nova Scotia; Ontario |
| NTS | 92I; 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 |
| Area | Williams 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 |
| Subjects | economic 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 |
| Illustrations | location maps; photographs; flow charts; cross-sections |
| Program | Targeted Geoscience Initiative (TGI-4) Intrusion/Porphyry Ore Systems |
| Released | 2015 06 11; 2023 03 17 |
| Abstract | The 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. |
| Summary | (Plain Language Summary, not published)
The Targeted Geoscience Initiative (TGI-4) is a collaborative federal geoscience program that provides industry with the next generation of geoscience
knowledge and innovative techniques to better detect buried mineral deposits, thereby reducing some of the risks of exploration. This volume summarises research activities completed under the TGI 4 Intrusion Related Mineralisation Project that
focused on porphyry-style ore systems related to the Cu- and Cu-Mo deposits of South-Central British Columbia and the Sn-W-Mo-In deposits in New Brunswick, Nova Scotia and Newfoundland. |
| GEOSCAN ID | 296463 |
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