Geoelectric evidence for centripetal resurge of impact melt and breccias over central uplift of Araguainha impact structure
Tong, Vincent C.H. and Lana, C. and Marangoni, Y.R. and Elis, V.R. (2010) Geoelectric evidence for centripetal resurge of impact melt and breccias over central uplift of Araguainha impact structure. Geology 38 (1), pp. 91-94. ISSN 0091-7613.
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.
|School:||Birkbeck Schools and Departments > School of Science > Earth and Planetary Sciences|
|Date Deposited:||25 Feb 2011 14:34|
|Last Modified:||17 Apr 2013 12:20|
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