Receiver operating characteristics (ROC) as validation tool for prospectivity models — A magmatic Ni–Cu case study from the Central Lapland Greenstone Belt,Northern Finland |
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| Institution: | 1. Bedrock Geology and Resources, Geological Survey of Finland, PO Box 77, FI-96101 Rovaniemi, Finland;2. Land Use and Environment, Geological Survey of Finland, PO Box 96, FI-02151 Espoo, Finland;1. Faculty of Engineering, Malayer University, Malayer, Iran;2. Bedrock Geology and Resources, Geological Survey of Finland, Rovaniemi, Finland;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | A prospectivity model for magmatic Ni–Cu deposits was created by integrating spatially referenced geophysical and geochemical datasets based on a simple and practical exploration model. The study area is the Central Lapland Greenstone Belt, Northern Fennoscandian Shield, Finland. Magmatic nickel deposits are related to rock types that are typically characterized by local magnetic and gravity anomalies. These deposit types can also be a source of nickel, copper and cobalt anomalies in the overlying glacial till cover. This straightforward exploration criterion was translated into a fuzzy logic prospectivity model. The model validation is an essential step in justifying the validity of the prospectivity model. This was accomplished by using receiver operating characteristics (ROC) technique. We used the known Ni–Cu occurrences and deposits as true positive cases and other deposit type locations or random points as true negative cases in the validation process. It appears that the ROC technique provides a robust model validation and optimization technique, providing that suitable validation data exists. |
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