Centre de documentation
scientifique

Spectral enhancement of selected pixels in Thematic Mapper images of the Guanajuato district (Mexico) to identify hydrothermally altered rocks / M.A. Torres-Verra in International Journal of Remote Sensing IJRS, vol 24 n° 22 (November 2003)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 24 n° 22 (November 2003) . - pp 4357 - 4373 Titre : Spectral enhancement of selected pixels in Thematic Mapper images of the Guanajuato district (Mexico) to identify hydrothermally altered rocks Type de document : Article/Communication Auteurs : M.A. Torres-Verra, Auteur ; R.M. Prol-Ledesma, Auteur Année de publication : 2003 Article en page(s) : pp 4357 - 4373 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] altération géologique [Termes IGN] faille géologique [Termes IGN] géologie structurale [Termes IGN] image Landsat-TM [Termes IGN] Mexico (Mexique) [Termes IGN] réponse spectrale [Termes IGN] ressources minérales [Termes IGN] roche [Termes IGN] spectrométrie Résumé : (Auteur) The use of satellite Thematic Mapper (TM) images in mineral exploration has been very successful in pointing out the presence of key minerals. Here we present the results of the spectral enhancement of a TM image to identify oxides and hydroxylbearing minerals in the GuanaJuato district, using the two methods that yielded the best results in this area: band subtraction and principal component analysis on an image that included only. selected pixels and excluded areas that did not present any interest for mineral exploration. Different types of vegetation cover the study area: crops, bushes and forest. Previous application of conventional methods was used to identify areas where the spectral signatures suggested the presence of hydrothermal alteration. and further detailed spectral enhancement in selected pixels allowed the identification of alteration minerals in areas covered with different vegetation types that do not have a similar spectral response. A field check performed using a PIMA (Portable Infrared Mineral Analyser) spectrometer yielded a good correlation of the marked areas with the presence of hydrothermally altered rock. New areas with argillic alteration were discovered in the Sierra de Guanajuato and the San Anton areas. Also, the main structures were determined by applying several filters to the first principal component. The occurrence of hydrothermal alteration and the presence of main faults were used to define areas favourable for further detailed exploration programmes. Numéro de notice : A2003-309 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/0143116031000075134 En ligne : https://doi.org/10.1080/0143116031000075134 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22605 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-03221	RAB	Revue	Centre de documentation	En réserve L003	Exclu du prêt