Iranian Journal of Remote Sensing and GIS

Iranian Journal of Remote Sensing and GIS

Comparison of the results of satellite image processing for extraction of alterations with mineralogy and field studies in Sarkuh Porphyry Copper Deposit

Document Type : علمی - پژوهشی

Authors
Sholeh Malekshahi 1
Iraj Rassa 2
Nematollah Rashid Nezhad Omran 3
Mohammad Lotfi 4
1 Islamic Azad University, Science and Research Branch of Tehran
2 Shahid Beheshti University, Faculty of Geosciences
3 Tarbiat Modares University, Faculty of Geosciences
4 Islamic Azad University, Tehran North Branch, Geosciences Research Institute
Abstract
Separation and mapping of alteration zones in the exploration of porphyry copper types is of particular importance. Aster sensor of Terra satellite image is used to show these alteration zones. There are different alteration in the Sarkuh area, include potassic, propylitic, phyllic, argillic, siliceous veins, and secondary effects to iron oxide-hydroxides that are reflected in the development of Aster images. Using methods such as color composition, band ratio, false color composition from band bonding and spectral analysis methods(Matched Filtering ، Ls-fit), was used. In argillic alteration, iron oxides and propylitic processes, Matched Filtering, Ls-fit And the bandwidth ratio method is used among these methods, the MF algorithm  and bandy's ratio is well answered. Potassic alteration has a close connection with mineralization. propylititic alteration includes calcite + chlorite + epidote + actinolite + sericite + pyrite in the surroundings of Stock and also volcanic rocks around it.. Phyllic alteration contains sericite and quartz.  The results obtained in this section are also consistent with the results of the XRD analysis. In survey field,  the set of alteration zones shows a relatively regular zoning with the north-east-southwest process with the center of the porphyry-type Sarkuh porphyry mass.
Keywords
ASTER
Alteration
Porphyry Copper
Sarkuh
Mineralogy
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