The Colônia Astrobleme, Brasil

Authors

  • Claudio Riccomini Universidade de São Paulo; Instituto de Geociências
  • Bruno Turcq Institut Français de Recherche Scientifique pour le Développement en Coopération; Centre ORSTOM de Bondy; Laboratoire des Formations Superficielles
  • Louis Martin Institut Français de Recherche Scientifique pour le Développement en Coopération; Centre ORSTOM de Bondy; Laboratoire des Formations Superficielles
  • Marcelo Z Moreira Centro de Energia Nuclear na Agricultura
  • Maria L Lorscheitter Universidade Federal do Rio Grande do Sul; Departamento de Botânica

DOI:

https://doi.org/10.5935/0100-929X.19910007

Abstract

About 35km south of the city of São Paulo, near Colônia, within Precambrian crystal line basement rocks, there is a well-defined ring feature, with 3.64km in diameter and filledby at least 263m of sediments, which corresponds to a probable astrobleme. It is defined by a hilly circular outer rim up to 125m higher than an inner alluvial plain presently occupied by a large swamp. This paper explains the regional geology of the area and discusses the different hypothesis as to the origin of the structure as well as the morphological parameters pertinent to an understanding of this feature. Preliminary vibrocore data are also presented

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Published

1991-12-01

Issue

Section

RIG050