Shahrood University of Technology Journal of Mining and Environment 2251-8592 13 2 2022 04 01 Delineation of Iron Alteration Zones using Spectrum-Area Fractal Model and TOPSIS Decision-Making Method in Tarom Metallogenic Zone, NW Iran 503 525 2462 10.22044/jme.2022.11770.2168 EN M. M. Pourgholam Department of Petroleum and Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran P. Afzal Department of Petroleum and Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran A. Adib Department of Petroleum and Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran K. Rahbar Department of Computer Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran M. Gholinejad Department of Petroleum and Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran Journal Article 2022 03 22 Signal analysis approaches are a powerful and widely used tool in processing multi-spectral satellite images for detection of alteration zones. The main goal of this work is application of the spectrum-area fractal methodology based on the Landsat 8 OLI satellite images’ data for separation alteration zones for iron oxides at the Tarom region (NW Iran). These alteration zones, Normalized Difference Vegetation Index (NDVI), and Normalized Difference Water Index (NWDI) are detected using the band-ratio and band combination methods. Then the calculated values are categorized by Spectral Angle Mapper (SAM), k-means, and S-A fractal model. Considering a positive correlation of iron oxides alterations along with magnetite mineralization as an index of mineralization at the studied region, the promising areas are classified by a decision-making model using the TOPSIS method with an acceptable accuracy for presenting in the exploration models. https://jme.shahroodut.ac.ir/article_2462_c5566fe3c1a6316084503f82cf01e4e6.pdf