Delineating mineralized phases based on lithogeochemical data using multifractal model in Touzlar epithermal Au–Ag (Cu) deposit,NW Iran |
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| Institution: | 1. Dept. of Geology St. Francis Xavier University P.O. Box 5000 Antigonish NS B2G 2W5 Nova Scotia Canada;2. Dept. of Geological Sciences Ohio University 316 Clippinger Laboratories Athens OH 45701-2979 Ohio USA;3. School of Earth and Ocean Sciences, University Victoria, P.O. Box 1700 STN CSC, Victoria, BC V8W 2Y2, Canada;1. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;2. Bayerisches Geoinstitut, University of Bayreuth, Bayreuth 95440, Germany;3. Geological Survey of China University of Geosciences, Wuhan 430074, China;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. School of Earth Sciences, The University of Melbourne, Victoria 3010, Australia;3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, China;4. Research Institute for Earth Sciences, Geological Survey of Iran, Tehran, Iran;5. Institute for Advanced Studies in Basic Sciences, Zanjan, Iran;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;4. Geological Survey of Iran, Azadi Square, Meraj Blvd, Tehran, Iran;5. Department of Geology, University of Leicester, Leicester LE1 7RH, UK |
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| Abstract: | The aim of this study is to delineate and separate mineralization phases based on surface lithogeochemical Au, Ag, As and Cu data, using the Concentration–Area (C–A) fractal method in the Touzlar epithermal Au–Ag (Cu) deposit, NW Iran. Four mineralization phases delineated by multifractal modeling for these elements are correlated with the findings of mineralization phases from geological studies. The extreme phase of Au mineralization is higher than 3.38 ppm, which is correlated with the main sulfidation phase, whereas Ag extreme phase (higher than 52.48 ppm) is associated with silicic veins and veinlets. The resulting multifractal modeling illustrates that Au and Ag have two different mineralization trends in this area. Extreme (higher than 398.1 ppm) and high mineralization phases of Cu from the C–A method correlate with hydrothermal breccias and main sulfidation stage in the deposit, respectively. Different stages of Au mineralization have relationships with As enrichment, especially in high and extreme (higher than 7.9%) phases. The obtained results were compared with fault distribution patterns, showing a positive correlation between mineralization phases and the faults present in the deposit. Moreover, mineralization phases of these elements demonstrate a good correlation with silicification and silicic veins and veinlets. |
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