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TitleAirborne gamma spectrometer-magnetic-VLF survey of northeastern Alberta
DownloadDownload (whole publication)
AuthorCharbonneau, B W; Holman, P B; Hetu, R J
SourceExploring for minerals in Alberta: Geological Survey of Canada geoscience contributions, Canada-Alberta Agreement on Mineral Development (1992-1995); by Macqueen, R W (ed.); Geological Survey of Canada, Bulletin 500, 1997 p. 107-1131, (Open Access)
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Macqueen, R W; (1997). Exploring for minerals in Alberta: Geological Survey of Canada geoscience contributions, Canada-Alberta Agreement on Mineral Development (1992-1995), Geological Survey of Canada, Bulletin no. 500
File formatpdf
NTS74L/09; 74L/10; 74L/11; 74L/12; 74L/13; 74L/14; 74L/15; 74L/16; 74M
AreaLake Athabasca; Fort Chipewyan; Slave River
Lat/Long WENS-112.0000 -110.0000 60.0000 58.5000
Subjectsgeophysics; gamma-ray surveys; v l f surveys, airborne; v l f surveys; magnetic surveys, airborne; magnetic surveys; uranium; thorium; potassium; uranium thorium ratios; uranium potassium ratios; thorium-potassium ratios; geophysical surveys; mineralization; geophysical interpretations; lithogeochemistry; Precambrian; Proterozoic
Illustrationssketch maps; analyses; photomicrographs
ProgramCanada-Alberta Agreement on Mineral Development, 1992-1995
Released1997 10 01
AbstractThe survey (10 000 km2) presented at 1:250 000 scale, based on 1 km flight line spacing, comprises 12 colour geophysical maps, a geological mineral occurrence map, and a set of 146 stacked multiparameter profiles. The digitally recorded survey is ideal for integration with other data sets acquired during this MDA and for geophysical modelling.
The radioelement distribution patterns provide significant information over the peraluminous igneous rocks. The thorium and uranium/thorium ratio map patterns are controlled by monazite which hosts most of the thorium and is generally accompanied by zircon. Uraninite and uranothorianite host most of the uranium. The more thoriferous magmatic rocks are less evolved (lower differentiation index) and have greater amounts of biotite, monazite and zircon. The more evolved magmatic rocks (more felsic) generally have lower thorium concentrations, which corresponds to less monazite and zircon. Areas of high potassium (with a low Th/K ratio) commonly relate to evolved granitoids although some anomalies may indicate potassium alteration.
Magnetic patterns relate to magnetite/ilmenite with some hematization of magnetite. The magnetic maps are particularly useful in outlining geological structure and faulting. VLF patterns correlate with fractures and high-grade metasedimentary bands and in places indicate sulphide-rich conductors.
Geophysical signatures have often been linked to processes which point to mineralization and potential exists for U, Mo, Cu, Sn, W, REE and Au. In northeastern Alberta such linkages are not currently recognized with the exception of VLF anomalies coincident with certain sulphide-rich metasedimentary bands and uranium anomalies relating to some uranium occurrences. However, with further investigation of observed geophysical patterns, correlations with mineralized systems may be recognized.