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Application of Airborne, Laboratory, and Field Hyperspectral Methods to Mineral Exploration in the Canadian Arctic: Recognition and Characterization of Volcanogenic Massive Sulfide-Associated Hydrothermal Alteration in the Izok Lake Deposit Area, Nunavut, Canada

Laakso, Kati and Rivard, Benoit and Peters, Jan and White, Peter and Maloley, Matthew and Harris, Jeff and Rogge, Derek (2015) Application of Airborne, Laboratory, and Field Hyperspectral Methods to Mineral Exploration in the Canadian Arctic: Recognition and Characterization of Volcanogenic Massive Sulfide-Associated Hydrothermal Alteration in the Izok Lake Deposit Area, Nunavut, Canada. Economic Geology, 110, pp. 925-941. Society of Economic Geologists. ISSN 0361-0128

Full text not available from this repository.

Official URL: http://econgeol.geoscienceworld.org/content/110/4/925.full.pdf+html

Abstract

We have investigated the application of ground, laboratory, and airborne optical remote sensing methods for the detection of hydrothermal alteration zones associated with the Izok Lake volcanogenic massive sulfide (VMS) deposit in Nunavut, Canada. This bimodal-felsic Zn-Cu-Pb-Ag deposit is located above the tree line in a subarctic environment where lichens are the dominant cryptogamic species coating the rocks. The immediate host rhyolitic rocks have been hydrothermally altered and contain biotite, chlorite, and white micas as dominant alteration minerals. These minerals have spectral Al-OH and Fe-OH absorption features in the shortwave infrared wavelength region that display wavelength shifts, which are documented to be due to chemical compositional changes. Our ground spectrometer measurements indicate that there is a systematic trend in the Fe-OH absorption feature wavelength position of biotite/chlorite with increasing distance from the VMS deposit: the average Fe-OH absorption feature wavelength position of the proximal areas (398–3,146 m from mineralization) is observed at 2,254 nm, and that of the distal areas (5,782–6,812 m) at 2,251 nm. Moreover, the proximal areas have an average Al-OH absorption feature wavelength position at 2,203 nm, in contrast with the average wavelength position at 2,201 nm in the distal areas, implying a spectral shift of 2 nm. These findings indicate that hydrothermal alteration zones can be detected by hyperspectral remote sensing, despite the presence of abundant lichen cover. However, the airborne results discussed in this study required the screening out of more than 99% of the pixels in the area.

Item URL in elib:https://elib.dlr.de/96162/
Document Type:Article
Title:Application of Airborne, Laboratory, and Field Hyperspectral Methods to Mineral Exploration in the Canadian Arctic: Recognition and Characterization of Volcanogenic Massive Sulfide-Associated Hydrothermal Alteration in the Izok Lake Deposit Area, Nunavut, Canada
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Laakso, KatiCenter for Earth Observation Science, Department of Earth and Atmospheric Sciences, University of AlbertaUNSPECIFIED
Rivard, Benoitbenoit.rivard (at) ualberta.caUNSPECIFIED
Peters, JanGeological Survey of CanadaUNSPECIFIED
White, PeterCanada Centre for Remote SensingUNSPECIFIED
Maloley, MatthewCanada Centre for Remote SensingUNSPECIFIED
Harris, JeffGeological Survey of CanadaUNSPECIFIED
Rogge, Derekderek.rogge (at) dlr.deUNSPECIFIED
Date:2015
Journal or Publication Title:Economic Geology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:110
Page Range:pp. 925-941
Publisher:Society of Economic Geologists
ISSN:0361-0128
Status:Published
Keywords:Hyperspectral, Remote Sensing, Mineral exploration, Geology
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Fernerkundung der Landoberfläche (old)
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Land Surface
Deposited By: Rogge, Derek
Deposited On:18 Jun 2015 09:30
Last Modified:17 Nov 2018 05:02

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