Determination of mineralization stages using correlation between geochemical fractal modeling and geological data in Arabshah sedimentary rock-hosted epithermal gold deposit,NW Iran |
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| Institution: | 1. Department of Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran;2. Research Institute of Earth Sciences, Geological Survey of Iran, Tehran, Iran;3. Geological Survey of Iran, National Geoscience Database of Iran, Tehran, Iran;4. Department of Geology, Tarbiat Modares University, Tehran 14115-175, Iran;5. Department of Mining and Metallurgical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran;6. Computational Geomechanics Group, College of Engineering, Mathematics and Physical Sciences, University of Exeter, Streatham Campus, Exeter, UK;1. MLR Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Centre for Exploration Targeting, ARC Centre of Excellence for Core to Crust Fluid Systems, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;3. MLR Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;4. Centre for Exploration Targeting, ARC Centre of Excellence for Core to Crust Fluid Systems, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;5. MLR Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;6. Centre for Exploration Targeting, ARC Centre of Excellence for Core to Crust Fluid Systems, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. School of Earth Science and Resources, China University of Geosciences, Xueyuan Road, Haidian District, Beijing 100083, China;3. Department of Earth Sciences, University of Adelaide, Adelaide, SA 5005, Australia;1. Sofia University, FGG, 1504 Sofia, Bulgaria;2. Institute of Earth Sciences, University of Graz, Univ. Pl. 2, A-8010 Graz, Austria;1. Department of Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran;2. Department of Petroleum Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran;3. Department of Computer Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran;1. Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, USA;2. Equity Exploration Consultants, Ltd., 1510-250 Howe Street, Vancouver, Canada |
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| Abstract: | This research paper aims to delineate and recognize different gold mineralization stages based on surface lithogeochemical data using factor analysis and Spectrum-Area (S-A) modeling, as well as geological data in Arabshah sedimentary rock hosted epithermal gold deposit, NW Iran. Based on the factor analysis, Au and Mn were allocated to factor 2 (F2) and then classified by the S-A fractal modeling. In addition, Au and F2 values were transformed to spectrum data, which were categorized by the S-A log-log plots. Accordingly, the main mineralization phase contains Au and F2 (Au-Mn) values greater than 800 ppb and 0.3, respectively, and is associated with the occurrence of minerals such as pyrite, arsenian pyrite, realgar, orpiment and oxidized sulfides. The first phase of gold mineralization, where Au typically ranges between 80 and 350 ppb, is associated with base metal sulfides, arsenian pyrites and F2 values between 0.1 and 0.2. The second gold mineralization phase consists of Au values from 350 to 800 ppb and F2 values between 0.2 and 0.3. Combination of the S-A modeling, factor analysis and geological data outlined three gold mineralization stages in Arabshah gold deposit. The main mineralization stage showed a strong positive correlation with the NE-SW and NW-SE trending structures, the altered intrusive rocks such as microdiorite and granodiorite, and the altered subvolcanic dacitic domes. |
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| Keywords: | Spectrum-Area (S-A) fractal model Gold mineralization stage Factor analysis Takab |
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