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Fuzzy logic modeling for hydrothermal gold mineralization mapping using geochemical, geological, ASTER imageries and other geo-data, a case study in Central Alborz, Iran

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Abstract

The study area is located ~50 km in the north of Tehran capital city, Iran, and is a part of central Alborz Mountain. The intrusive bodies aged post Eocene have intruded in the Eocene volcanic units causing hydrothermal alterations in these units. Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) images were used to map hydrothermal alteration zones. The propylitic, phyllic and argillic alteration and iron oxide minerals identified using Spectral Angle Mapper (SAM) method. Structural lineaments were extracted from ASTER images by applying automatic lineament extraction processes and visual interpretations. An exploration model was considered based on previous studies, and appropriate evidence maps were generated, weighted and reclassified. Ore Forming Potential (OFP) map was generated by applying Fuzzy SUM operator on alteration and Pb, Cu, Ag, and Au geochemical anomaly maps. Finally, Host rock, geological structures and OFP were combined using Fuzzy Gamma operator (γ ) to produce mineral prospectivity map. Eventually, the conceptual model discussed here, fairly demonstrated the known hydrothermal gold deposits in the study area and could be a source for future detailed explorations.

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Acknowledgments

The authors gratefully acknowledge the Geological Survey of Iran (GSI) for preparing the data. We would like to thank the unknown reviewers for their constructive comments on early drafts of the manuscript, which helped us improve our paper.

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Authors and Affiliations

  1. Department of Data and Remote Sensing, Iranian National Institute for Oceanography and Atmospheric Science, No. 3, Etemadzadeh St., Fatemi Ave, Tehran, 1411813389, IR, Iran

    Masoud Moradi & Keivan Kabiri

  2. School of Geology, College of Science, University of Tehran, Tehran, Iran

    Sedigheh Basiri & Ali Kananian

Authors
  1. Masoud Moradi
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  2. Sedigheh Basiri
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  3. Ali Kananian
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  4. Keivan Kabiri
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Correspondence to Keivan Kabiri.

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Communicated by: H. A. Babaie

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Moradi, M., Basiri, S., Kananian, A. et al. Fuzzy logic modeling for hydrothermal gold mineralization mapping using geochemical, geological, ASTER imageries and other geo-data, a case study in Central Alborz, Iran. Earth Sci Inform 8, 197–205 (2015). https://doi.org/10.1007/s12145-014-0151-9

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  • DOI: https://doi.org/10.1007/s12145-014-0151-9

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