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TitleDetecting and mapping gossans using remotely-sensed data: a review
AuthorHarris, J R; Williamson, M CORCID logo; Percival, J BORCID logo; Behnia, P
SourceGeological Association of Canada-Mineralogical Association of Canada, Joint Annual Meeting, Abstracts Volume vol. 37, 2014 p. 114 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20130434
MeetingGeological Association of Canada - Mineralogical Association of Canada Joint Annual Meeting; Fredericton; CA; May 21-23, 2014
File formatpdf
Subjectssurficial geology/geomorphology; geophysics; remote sensing; gossans; mapping techniques; computer mapping
Illustrationssatellite imagery; tables; graphs; location maps; diagrams
ProgramEnvironmental Geoscience environmental impacts and adaptation in the northern environment
Released2014 01 01
AbstractGossans are surficial deposits that form by the oxidation of sulphides in host rocks where acidic and oxidizing fluids are available. In a classic gossan profile, primary sulphides are replaced by iron - bearing pseudomorphs such as ferrihydrite, goethite and jarosite. The soils typically accumulate as surficial deposits and form an oxide cap. Most gossans have a distinct colour ranging from red to orange to yellow due to the presence of ferric iron and in some cases can be black due to weathering of manganese oxides. Gossans are important vectors to buried ore deposits but they also impact the polar environment if the resulting acid solution transfers transition metals into the permafrost and local catchment basin. Remote sensing can be used not only to detect and map gossans but, with the advent of hyperspectral imaging, uniquely identify iron - bearing minerals. This presentation reviews image processing techniques developed for detection and identification of gossan mineralogy using a variety of moderate resolution spectral/spatial sensors as well as more advanced high resolution instruments. A number of northern Canadian study areas will illustrate these image processing techniques. In addition, ground and laboratory spectra of the various iron - bearing minerals are used to compare and verify the signatures derived from the remotely sensed data.
Summary(Plain Language Summary, not published)
The conference presentation will offer an overview of remote sensing applied to the detection of gossans in Canada's North. The authors have collaborated since 2011 on the occurrence, mineralogy and geochemistry of gossans on central Victoria Island, Northwest Territories, and the western part of Axel Heiberg Island, Nunavut. They will summarize the results of the research activity, and compare these observations to those that characterize gossans located in other areas of Canada's North.

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