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      The detection of potassic alteration by gamma‐ray spectrometry—Recognition of alteration related to mineralization

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      GEOPHYSICS
      Society of Exploration Geophysicists

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          Abstract

          Canadian case histories document the use of airborne and ground gamma‐ray spectrometry to detect and map potassium alteration associated with different styles of mineralization. These include: volcanic‐hosted massive sulfides (Cu‐Pb‐Zn), Pilley’s Island, Newfoundland; polymetallic, magmatic‐hydrothermal deposits (Au‐Co‐Cu‐Bi‐W‐As), Lou Lake, Northwest Territories; and porphyry Cu‐Au‐(Mo) deposits at Mt. Milligan, British Columbia and Casino, Yukon Territory. Mineralization in two of these areas was discovered using airborne gamma‐ray spectrometry. In each case history, alteration produces potassium anomalies that can be distinguished from normal lithologic potassium variations by characteristic lows in eTh/K ratios. Interpretations incorporating airborne and ground spectrometry, surficial and bedrock geochemistry and petrology show that gamma‐ray spectrometric patterns provide powerful guides to mineralization. This information complements magnetic, electromagnetic, geological, and conventional geochemical data commonly gathered during mineral exploration programs.

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          Most cited references15

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          Lateral and vertical alteration-mineralization zoning in porphyry ore deposits

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            Rock classification by characteristics of aerial gamma-ray measurements

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              Hydrothermal alteration as a control of regional geochemistry and ore formation in the central Baltic Shield

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                Author and article information

                Journal
                GEOPHYSICS
                GEOPHYSICS
                Society of Exploration Geophysicists
                0016-8033
                1942-2156
                November 01 2000
                November 2000
                : 65
                : 6
                : 2001-2011
                Affiliations
                [1 ]Geological Survey of Canada, Mineral Resources Division/Airborne Geophysics Section, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada
                Article
                10.1190/1.1444884
                1ed3e02c-dbf9-4d00-b9e1-e566dafbd7dd
                © 2000
                History

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