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Remote sensing and GIS analyses of the Strangways impact structure, Northern Territory

Remote sensing and GIS techniques play a substantial role for the identification of possible terrestrial impact structures, for mapping target-rock lithologies and deciphering the structural style of known craters. In this case study the lithological and structural characteristics of the highly eroded Proterozoic Strangways impact crater in the Northern Territory have been analysed on the basis of Landsat Enhanced Thematic Mapper satellite imagery, topographical data and airborne geophysical data. Regarding Landsat data, the calculation of basic statistical parameters and the optimum index factor has been found useful for a pre-selection of informative band combinations. By means of the analysis of multisensoral data, the distribution of crystalline basement rocks, siliciclastic target rocks of the Roper Group as well as post-impact deposits and deeper seated Proterozoic dykes can be detected. The original crater dimensions of the Strangways structure are carefully estimated at 26 – 29 km by combining the remote sensing data with the distribution of shatter cones localised in the field. The remote sensing/GIS approach of a geological interpretation based on multisensoral sources and combined fieldwork data can be successfully applied to other impact structures on earth, as well.