GIS-based 3D prospectivity mapping: A case study of Jiama copper-polymetallic deposit in Tibet,China |
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| Institution: | 1. MLR Key Laboratory of Metallogeny and Mineral Resource Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. Centre for Exploration Targeting and Australian Research Council Centre of Excellence for Core to Crust Fluid Systems (CCFS), School of Earth and Environment, The University of Western Australia, Crawley, WA 6009, Australia;3. Centre of Studies in Resources Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India;1. School of Earth and Oceans, James Cook University, Townsville 4811, Queensland, Australia;2. International Rice Research Institute, Los Baños 4030, Laguna, Philippines;1. X-plore Geoconsulting, 39 Morritt Close, Rockingham, WA 6168, Australia;2. Economic Geology Research Centre (EGRU), School of Earth & Environmental Science, James Cook University, Townsville, QLD 4811, Australia;3. ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC), Department of Earth and Planetary Sciences, Macquarie University, North Ryde, NSW 2109, Australia;4. Kenex Ltd, PO Box 41136, Eastbourne, Wellington, New Zealand;1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;2. State Key Lab of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;4. Department of Earth and Space Science and Engineering, Department of Geography, York University, 4700 Keele Street, Toronto, ON M3J1P3, Canada;5. Department of Earth and Oceans, James Cook University, Townsville 4811, Queensland, 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, Beijing 100083, China;3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;4. Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China;5. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China;6. Petrochina Research Institute of Petroleum Exploration & Development, Beijing 100083, China |
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| Abstract: | This paper reports a deposit-scale GIS-based 3D mineral potential assessment of the Jiama copper-polymetallic deposit in Tibet, China. The assessment was achieved through a sequential implementation of metallogenic modelling and 3D modelling of geology, geochemistry and prospectivity. A metallogenic model for the Jiama deposit and 3D modelling workflow were used to construct multiple 3D layers of volumetric and triangular mesh models to represent geology, geochemistry and ore-controlling features in the study area. A GIS-based 3D weights-of-evidence analysis was then used to estimate the subsurface prospectivity for Cu (Mo) orebodies in the area, which led to the identification of three prospective deep-seated exploration targets. Additionally, the geochemical modelling indicates three potential fluid flow pathways based on the 3D zonation of major geochemical elements and their ratios, particularly the Zn/Pb ratios, which support the results of the weights of evidence model. |
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