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Prospectivity mapping of orogenic lode gold deposits using fuzzy models: a case study of Saqqez area, NW of Iran

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Abstract

This research aims to evaluate and compare Geographical Information Systems (GIS)-based fuzzy models for producing orogenic gold prospectivity maps in the Saqqez area, NW of Iran. Gold occurrences are hosted in sericite schist and mafic to felsic meta-volcanic rocks in this area, and are associated with hydrothermal alterations that extend over ductile to brittle shear zones. The predictor maps, which represent the Pre-(Source/Triger/Pathway), syn-(deposition/physical/chemical traps) and post-mineralization (preservation/distribution of indicator minerals) sub-systems for gold mineralization, were generated using empirical understandings of the specifications of known orogenic gold deposits and gold mineral systems, and were then pre-processed and integrated to produce mineral prospectivity maps. Five fuzzy logic operators, including AND, OR, Fuzzy Algebraic Product (FAP), Fuzzy Algebraic Sum (FAS), and GAMMA, were applied to the predictor maps in order to find the most efficient prediction model. Prediction-Area (P-A) plots and field observations were used to assess and evaluate the accuracy of prediction models. Mineral prospectivity maps generated by AND, OR, FAP, and FAS operators were inaccurate and therefore unable to pinpoint the exact location of discovered gold occurrences. The GAMMA operator, on the other hand, produced acceptable results and identified potentially economic target sites. The P-A plot revealed that 68% of known orogenic gold deposits are found in high and very high potential regions. The GAMMA operator was shown to be useful in predicting and defining cost-effective target sites for orogenic gold deposits, as well as optimizing mineral deposit exploitation.

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Acknowledgements

The authors thankfully acknowledge the constructive suggestions received from the JESI’s editor, and anonymous reviewers.

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Authors and Affiliations

  1. Department of Earth Sciences, Faculty of Sciences, Shiraz University, Shiraz, Iran

    Fanous Mohammadi & Majid H. Tangestani

  2. Geosciences Institute, University of Campinas- UNICAMP, PO Box 6152, 13083-970, Campinas, SP, Brazil

    Mohammad H. Tayebi

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Mohammadi, F., Tangestani, M.H. & Tayebi, M.H. Prospectivity mapping of orogenic lode gold deposits using fuzzy models: a case study of Saqqez area, NW of Iran. Earth Sci Inform 15, 2387–2404 (2022). https://doi.org/10.1007/s12145-022-00803-w

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