An integrated remote sensing and geophysical investigation of the Gwanda greenstone belt, southern Zimbabwe
An integrated remote sensing and geophysical investigation of the Gwanda greenstone belt, southern Zimbabwe
Landsat MSS imagery from the wet and dry season, aeromagnetic coverage and regional gravity data, topographic data and aerial photography have been processed and integrated together using a high-level image processing system. The image processing techniques used include directional filtering for lineament analysis, and multispectral classification to improve lithological discrimination. Forward modelling has been applied to the geophysical profiles. The integration methods tested include variations on the Intensity-Hue-Saturation colour transformation, the inverse principal components transformation, and generation of a digital elevation model for the Gwanda area for 3-Dimensional data visualisation.
Interpretation of the Landsat MSS data has shown that major lithological boundaries within the greenstone belt can be mapped successfully. Vegetation shows little relationship to underlying bedrock. Aeromagnetic interpretation has allowed the identification of eight magnetic domains which characterise the area. Different domains within the granite-gneiss basement are attributed to the presence of younger intrusive granites, the Chilimanzi suite. An area of fracturing is also identified in the granite from the aeromagnetic data, and this is interpreted as an extension of a NW-SE trending shear zone. Gravity modelling reveals the depth of the greenstone belt to be approximately 4km. Lineament analysis and selective filtering of the aeromagnetic data reveals the presence of at least four fracture sets, three of which are intruded by mafic dykes. These can be correlated with Archaean deformation events and post-Archaen tectonic activity, allowing a more complete structural history of the area to be determined.
High resolution, geological interpretation has been successfully accomplished by using a merged Landsat - aerial photograph stereo image, integrated using the inverse principal components transformation. Other, more regional interpretations have been achieved using merged Landsat - aeromagnetic data using the IHS transform, and 3-Dimensional projection of merged Landsat - aerial photography for enhanced structural interpretation.
University of Southampton
1996
Kerr, Charles Henry
(1996)
An integrated remote sensing and geophysical investigation of the Gwanda greenstone belt, southern Zimbabwe.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Landsat MSS imagery from the wet and dry season, aeromagnetic coverage and regional gravity data, topographic data and aerial photography have been processed and integrated together using a high-level image processing system. The image processing techniques used include directional filtering for lineament analysis, and multispectral classification to improve lithological discrimination. Forward modelling has been applied to the geophysical profiles. The integration methods tested include variations on the Intensity-Hue-Saturation colour transformation, the inverse principal components transformation, and generation of a digital elevation model for the Gwanda area for 3-Dimensional data visualisation.
Interpretation of the Landsat MSS data has shown that major lithological boundaries within the greenstone belt can be mapped successfully. Vegetation shows little relationship to underlying bedrock. Aeromagnetic interpretation has allowed the identification of eight magnetic domains which characterise the area. Different domains within the granite-gneiss basement are attributed to the presence of younger intrusive granites, the Chilimanzi suite. An area of fracturing is also identified in the granite from the aeromagnetic data, and this is interpreted as an extension of a NW-SE trending shear zone. Gravity modelling reveals the depth of the greenstone belt to be approximately 4km. Lineament analysis and selective filtering of the aeromagnetic data reveals the presence of at least four fracture sets, three of which are intruded by mafic dykes. These can be correlated with Archaean deformation events and post-Archaen tectonic activity, allowing a more complete structural history of the area to be determined.
High resolution, geological interpretation has been successfully accomplished by using a merged Landsat - aerial photograph stereo image, integrated using the inverse principal components transformation. Other, more regional interpretations have been achieved using merged Landsat - aeromagnetic data using the IHS transform, and 3-Dimensional projection of merged Landsat - aerial photography for enhanced structural interpretation.
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Published date: 1996
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Local EPrints ID: 460287
URI: http://eprints.soton.ac.uk/id/eprint/460287
PURE UUID: 01093da3-0d7e-4af7-aab2-d17845e6d311
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Date deposited: 04 Jul 2022 18:17
Last modified: 04 Jul 2022 18:17
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Author:
Charles Henry Kerr
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