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Two Probable Astroblemes in Brazil

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Abstract

MORE than forty structures have now been identified as astroblemes, ancient geological scars produced by the impacts of large cosmic bodies on the Earth1. We report here some preliminary results on the study of two new astroblemes in Brazil, the Araguainha Dome and the Serra da Canghala structure. Although relatively young meteorite impact craters have been identified in Argentina2 and Chile3, these two Brazilian structures are the first ancient astroblemes to be reported from South America. The impact origin of the Araguainha Dome has been established by the discovery of diagnostic shock-metamorphic effects4 in its rocks. No shock effects have yet been identified in rocks from the Serra da Canghala structure.

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Authors and Affiliations

  1. NOAA, Atlantic Oceanographic and Meteorological Laboratories, 15 Rickenbacker Causeway, Miami, Florida, 33149

    ROBERT S. DIETZ

  2. 7408 Wyndale Lane, Chevy Chase, Maryland, 20015

    BEVAN M. FRENCH

Authors
  1. ROBERT S. DIETZ
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  2. BEVAN M. FRENCH
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DIETZ, R., FRENCH, B. Two Probable Astroblemes in Brazil. Nature 244, 561–562 (1973). https://doi.org/10.1038/244561a0

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  • DOI: https://doi.org/10.1038/244561a0

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