Volume 15, Issue 2 (10-2007)                   www.ijcm.ir 2007, 15(2): 439-452 | Back to browse issues page

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Application of ET~ image in detecting alteration halos and discriminating lithological units in Mianeh (eastAzarbayjan). www.ijcm.ir. 2007; 15 (2) :439-452
URL: http://ijcm.ir/article-1-823-en.html
Abstract:   (717 Views)

The alka line and calc-alkaline volcanic activities in Mianch have
reactivated the hydrothermal so lutions, resulting in the fonnation of
epithermal mineralization in the region. The mineralized zone trending NWSE,
and has been affected by NE-SW bended and folded structures. The
precious and base metals mineralization are confined to structurally hended
zone. Landsat-7(ETMJ data were used to study the alteration zones,
structural features and to discriminate the lithological units in the region. The
primary corrections were carried out on the images and the data resampled to
1 Sm. Based on spectral pattern of minerals present in the alteration system,
such as chlorite, epidote, kaolinite, jarosite, geotite, hydrothermal alteration
zones of the area were detected using band ratio and principle component
analysis (PCA) techniques, which also well correlated with field studies. The
linear and ring structural features along with lithological units were
discriminated based on spectral features of minerals. Ultimately, the study
reveals that the application of PCA resulted in enhancement of alteration
halos. The field checks have confinned the achievement and indicate the
western part of the area as potentially promising zone.

Full-Text [PDF 1948 kb]   (171 Downloads)    
Type of Study: Research | Subject: Special
Received: 2017/06/20 | Accepted: 2017/06/20 | Published: 2017/06/20

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