Tong C.H., Lana C., Marangoni Y.R., Elis V.R.
Department of Earth and Planetary Sciences Birkbeck, University of London, Malet Street, London WC1E 7HX, United Kingdom; Department of Geology, University of Stellenbosch, Private Bag X1, Matieland 7620, South Africa; Instituto de Astronomia Geofisica e Ciencias Atmosfericas, USP, Rua do Matao 1226, Sao Paulo, SP 05508-090, Brazil
Tong, C.H., Department of Earth and Planetary Sciences Birkbeck, University of London, Malet Street, London WC1E 7HX, United Kingdom; Lana, C., Department of Geology, University of Stellenbosch, Private Bag X1, Matieland 7620, South Africa; Marangoni, Y.R., Instituto de Astronomia Geofisica e Ciencias Atmosfericas, USP, Rua do Matao 1226, Sao Paulo, SP 05508-090, Brazil; Elis, V.R., Instituto de Astronomia Geofisica e Ciencias Atmosfericas, USP, Rua do Matao 1226, Sao Paulo, SP 05508-090, Brazil
We present five profiles from electrical resistivity tomography (ERT), with surface constraints and gravity data, in the central uplift of the Araguainha impact structure in central Brazil. The central uplift, the overlying polymict breccias, and decameter-scale impact melt rocks are characterized by contrasting ranges of electrical resistivity. Our resistivity model provides empirical evidence that supports the existing model in which impact melt and breccias resurged toward the crater center in the final stages of the cratering process. On the basis of our results from the first use of ERT in impact cratering studies, we conclude that the deposition and flow of impact melt and breccias over the central uplift were influenced by the geometry of the lithologic boundaries in the central uplift. © 2010 Geological Society of America.
Electrical resistivity; Electrical resistivity tomography; Empirical evidence; Geoelectric; Gravity data; Impact cratering; Impact melt; Impact structures; Surface constraints; Electric conductivity; Geomorphology; Radiative transfer; Tomography; Rocks; breccia; crater; deposition; electrical resistivity; geoelectric field; impact structure; lithology; melt; tomography; uplift; Araguainha Dome; Brazil