1. Prospectivity mapping for high sulfidation epithermal porphyry deposits using an integrated compositional and topographic remote sensing dataset.
- Author
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Ferrier, Graham, Ganas, Athanassios, and Pope, Richard
- Subjects
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REMOTE sensing , *PORPHYRY , *MINES & mineral resources , *ANALYTIC hierarchy process , *MINERALIZATION , *SULFIDATION - Abstract
Understanding porphyry epithermal alteration zones and associated mineralisation very complex. Intimate spatial relationship between volcanic processes and structures and porphyry-epithermal mineralisation. This study proposes using structured modelling approach to integrate wide range of spatial datasets. Satellite remote sensing provided highly accurate useful surface compositional datasets which were integrated into the modelling. • Epithermal porphyry alteration zones mapped using remote sensing approach. • Integration of compositional and topographic data provides powerful mapping method. • Epithermal porphyry alteration zones on Lesvos mapped clearly. • Mineral Prospectivity Mapping of epithermal porphyry alteration implemented. The targeting and discovery of epithermal porphyry mineral deposits can be enhanced using a structured quantitative methodology to analyse the distribution of ore deposits and model their spatial association with exploration evidence providing improved understanding on the controls of ore deposition. A novel exploration tool integrating field and ASTER SWIR and TIR satellite imagery has been developed which provides an enhanced means of resolving surface expressions of the residual silica core of the lithocap. The alteration zones were clearly resolved by the remote sensing data and an intimate spatial relationship between high-grade altered rocks and topographic highs was identified at a number of locations. A Mineral Prospectivity Modelling (MPM) approach, parameterized by the results of the remote sensing study, using a GIS-based weighted linear combination implementation of a Multi-Criteria Evaluation approach and utilising a fuzzy Analytical Hierarchy Process to elucidate expert knowledge has been implemented to target high sulfidation epithermal porphyry deposits on the Island of Lesvos, Greece. The results from this integrated altitudinal-compositional modelling approach closely matched the hydrothermal alteration mapped in the field supporting the accuracy of this MPM approach. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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