The Araguainha astrobleme/Central Brazil |
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| Authors: | Dr Barbara Theilen-Willige |
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| Institution: | 1. Hüttenweg 8, 3392, Clausthal-Zellerfeld, W-Germany
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| Abstract: | The following facts have supported the origin of the Araguainha circular structure in Central Brazil by a meteoritic impact: - the almost circular contour
- the impact-morphologic sequence including a central uplift, ring walls and a basin rim of escarpments
- outcrops of suevites and mixed breccias
- the evidence of shock metamorphism
- the presence of shatter cones, and
- negative anomalies of the total intensity of the magnetic field at the center of the ring structure.
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