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TitleCombined hyperspectral and lithogeochemical estimation of alteration intensities in a volcanogenic massive sulfide deposit hydrothermal system: a case study from northern Canada
AuthorLaakso, K; Peter, J MORCID logo; Rivard, B; Gloaguen, R
Source2016 8th Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS); 8071707, 2017 p. 1-4,
Alt SeriesEarth Sciences Sector, Contribution Series 20160024
Meeting2016 8th Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing (WHISPERS); Los Angeles, CA; US; August 21-24, 2016
Mediapaper; on-line; digital
File formatpdf
AreaIzok Lake
Lat/Long WENS-112.9167 -112.6667 65.6375 65.6167
Subjectseconomic geology; geophysics; geochemistry; Science and Technology; Nature and Environment; mineral exploration; exploration methods; mineral deposits; sulphide deposits; volcanogenic deposits; remote sensing; satellite imagery; lithogeochemistry; tectonic setting; hydrothermal systems; hydrothermal alteration; chlorite; bedrock geology; lithology; igneous rocks; volcanic rocks; andesites; dacites; basalts; rhyolites; intrusive rocks; diabases; gabbros; granitic rocks; sedimentary rocks; petrographic analyses; core samples; Izok Lake Deposit
Illustrationslocation maps; geoscientific sketch maps; 3-D models
ProgramTargeted Geoscience Initiative (TGI-4) Volcanogenic Massive Sulfide Ore Systems
Released2017 10 19
AbstractThe most intense hydrothermally altered rocks in volcanogenic massive sulfide (VMS) deposit systems occur in the stratigraphically underlying feeder zone and rocks immediately adjacent to mineralization. This alteration zone is typically much larger than the mineralization itself, and hence the ability to detect such alteration by optical remote sensing can be invaluable for mineral exploration. Our investigation focuses on assessing the applicability of hyperspectral data to determine trends in hydrothermal alteration intensity in and around the Izok Lake VMS deposit in northern Canada. To this end, we linked hydrothermal alteration intensity information based on two indices, the Ishikawa (AI) and chlorite-carbonate-pyrite (CCPI), to hyperspectral field and laboratory data in three dimensions. Our results suggest that chlorite group minerals display variable chemical composition across the study area that broadly correlates with hydrothermal alteration intensity.
Summary(Plain Language Summary, not published)
This 4-page conference paper and oral presentation details the application of field portable optical remote sensing data coupled with bulk geochemical data for outcrop and drillcore samples at a northern base metal (Cu, Pb, Zn) deposit for the purpose of developing methodologies and protocols to directly detect so-called hydrothermal alteration associated with such deposits. the methodologies have application elsewhere in northern Canada with good rock exposure and limited vegetation cover.

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