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Enhanced detection of gossans using hyperspectral data: Example from the Cape Smith Belt of northern Quebec, Canada

Laakso, Kati and Rivard, Benoit and Rogge, Derek (2016) Enhanced detection of gossans using hyperspectral data: Example from the Cape Smith Belt of northern Quebec, Canada. ISPRS Journal of Photogrammetry and Remote Sensing, 114, pp. 137-150. Elsevier. ISSN 0924-2716

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Official URL: http://www.sciencedirect.com/science/article/pii/S0924271616000472


Owing to the links between gossans and mineral deposits, detecting gossans by remote sensing means is essential for mineral exploration. In northern regions, gossans can develop as thin oxidized surfaces, named thin gossans, that can be covered with lichens. This study investigates the effects of spectral mixing between such gossans with lichens and their rock substrates using laboratory spectroscopic data obtained from samples collected in the Cape Smith Belt of Canada. These observations are then scaled up to the airborne hyperspectral data obtained from the same area. Our laboratory results indicate that the presence of lichens on gossans induces a general spectral shift towards shorter wavelengths of the iron absorption typical of gossan spectra. The opposite shift is observed due to the influence of the rock substrates. These effects can thus impede classification of gossans based on the interpretation of iron oxide mineralogy from spectra. Our airborne spectral results suggest that thin gossans can be detected and discriminated from thick gossans, and further broken down into several classes according to their host rock substrates. The ability to define distinct classes of thin gossans is significant since the association of these gossans with specific rock substrates can be exploited for exploration. The ability to distinguish thin and thick gossans alone can contribute to mineral exploration since it can be either the former or the latter group of gossans that acts as an ore deposit vector.

Item URL in elib:https://elib.dlr.de/103193/
Document Type:Article
Title:Enhanced detection of gossans using hyperspectral data: Example from the Cape Smith Belt of northern Quebec, Canada
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
Rogge, Derekderek.rogge (at) dlr.deUNSPECIFIED
Date:February 2016
Journal or Publication Title:ISPRS Journal of Photogrammetry and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 137-150
Keywords:Gossan Iron oxide minerals Mineral exploration Geological mapping Hyperspectral airborne remote sensing
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:24 Feb 2016 08:46
Last Modified:06 Sep 2019 15:28

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